JPH07100701A - Coated cutting tool and its manufacture - Google Patents

Abstract

PURPOSE:To enhance wear resistance of a coat itself and to increase separation resistance of the coat at the time of cutting by specifying a chlorine content of an inner layer when an innermost layer, which is in contact with a base metal, of a coating layer of a coated cutting tool is constituted of titanium nitride carbide. CONSTITUTION:In a coated cutting tool suitable for high speed cutting, a coating layer consisting of an inner layer and an outer layer is formed on a surface of a base metal consisting of tungusten-carbide-group cemented carbide, titanium- nitride-carbide-group cermet, silicon-nitride-group ceramics, etc. In this case, the inner layer is constituted of either a single layer of titanium nitride carbide, which is in contact with the base metal, or two or more layers consisting of titanium nitride having a thickness of 0.1 to 2mum which is in contact with the base metal, and titanium nitride carbide existing right above the titanium nitride. Meanwhile, the outer layer is constituted of single or multiple layers of and one or more kinds of elements selected from aluminum oxide, zirconium oxide, hafnium oxide, etc. In this case, a chlorine content of the inner layer, as a mean value of the inner layer as a whole, set at 0.05 atomic percentage or under in order to increase separation resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated cutting tool in which a base material such as a cemented carbide is coated with a coating which is tough and has excellent wear resistance, and a method for producing the same.

[0002]

2. Description of the Related Art Titanium carbide (T) is formed on the surface of cemented carbide, cermet and ceramics.
The life of the cutting tool is improved by depositing a coating layer such as iC). Generally, a coating layer produced by using a thermal chemical vapor deposition method (hereinafter, thermal CVD method) or a plasma CVD method is used. Widely used. However, when machining is performed using these coated cutting tools, machining that requires wear resistance of the coating layer at high temperatures, such as high-speed cutting, or machining that requires a large number of machining, such as machining of small parts The tool life was shortened due to insufficient wear resistance of the coating layer or damage to the coating layer due to machining that frequently bites the material. Further, although the coating film formed by the thermal CVD method has excellent adhesion to the base material, depending on the type of base material,
In particular, at the cutting edge ridge that contributes to performance, the η phase, which is an embrittlement layer, tends to thickly precipitate at the interface with the base metal, and the coating layer drops off together with this η phase during cutting, and wear progresses. In some cases, variations in tool life were caused, and it cannot be said that the coating layer sufficiently contributed to the improvement in life.

In these coated cutting tools, the chlorine content and orientation in the components forming the coating are factors that affect the wear resistance and peeling resistance of the coated cutting tools. Generally, heat C
Titanium carbide or titanium nitride (TiN) coating by the VD method or the plasma CVD method uses titanium tetrachloride (T) as a titanium source.
iCl ₄ ), methane (CH ₄ ) as a carbon source, and nitrogen gas (N ₂ ) as a nitrogen source. Therefore, in the coating using these gases, chlorine derived from titanium tetrachloride is taken into the coating layer, which causes deterioration of the film quality. Previous reports on chlorine in the film include plasma CVD and coating on the low temperature side.
"Surface Technology, vol.40, No.10, 1989, p.
51-55 "and surface technology, vol. 40, No.
4, 1989, p33-36 ", etc. This report shows that the level of chlorine in a film can be reduced to about 1 atomic% by forming a film by plasma CVD up to -700 ° C. The film quality is obtained.

Further, Japanese Patent Application Laid-Open No. 4-13874 discloses that
In the titanium carbide coating layer, the chlorine content in the portion less than 0.5 μm from the substrate surface is 0.025 to 0.055 atomic%,
It has been reported that a titanium carbide film having excellent film adhesion and excellent wear resistance can be obtained by forming two layers of 0.055 to 1.1 atom% in a portion of 0.5 μm or more. However, in the method described in this publication, titanium tetrachloride is used as a raw material gas and free carbon (C) from methane is used as a carbon source, so that chlorine (C) derived from titanium tetrachloride is used.
l) and free carbon derived from methane are incorporated into the film, which adversely affects the properties of the film. Particularly, the precipitation of C in the film lowers the wear resistance of the film, which is not preferable.
When 5 atomic% or more of chlorine is present, there is no precipitation of carbon and a titanium carbide film having excellent wear resistance can be obtained. Therefore, in this method, the content of chlorine is set to 0.025 to 0.055 atomic% near the interface of the substrate in order to enhance the adhesiveness,
It was necessary to have a two-layer structure of 0.055 atomic% or more in the part away from the interface. Moreover, in this case, since the presence of chlorine itself causes a decrease in wear resistance, the wear resistance of the obtained coating is still insufficient.

Conventionally, when intermittent cutting or part processing is performed using a coated cutting tool provided with a coating layer by the thermal CVD method,
Separation between the base material and the membrane and damage to the membrane itself in the membrane occur,
Although the base material was often exposed or damaged due to this, the orientation of the coating layer is considered as one of the causes of the damage of the film itself. It is generally known that a coating layer of titanium carbide or the like formed by thermal CVD is strongly oriented on the (220) plane (Journal of the Japan Institute of Metals, Vol. 41, No. 6, 19).
77, P542-545, etc.), the (220) plane is a primary slip surface at a cutting edge temperature of about 600 ° C. or lower in titanium carbide having a rock salt type structure, Breakage easily occurs in the plane direction. In addition, in the vicinity of the interface with the base metal, the tensile residual stress due to the difference in the thermal expansion coefficient between the base metal and the coating layer is particularly large in the coating layer, so the film is cut by the work material and chips during processing. It is considered that when the film is subjected to shear stress by being rubbed in the direction parallel to the surface, it is very likely to be broken in the film near the interface with the base material.

As a solution to the above-mentioned problem of the η phase, a method of forming a titanium carbonitride film by a thermal CVD method using an organic CN compound such as acetonitrile (CH ₃ CN) has attracted attention (Japanese Patent Laid-Open No. 117809, JP-A-50
-1098828, etc.). Since this method enables coating at a slightly lower temperature than the conventional thermal CVD method, it is generally a medium temperature CVD method (MT-CVD method).
Law) is called. Conventional thermal CVD method (high temperature CVD
Method; referred to as the HT-CVD method), an element (especially carbon) is transferred from the base material to the coating during the formation of the titanium-based coating, and an altered layer (Co ₃ W ₃ C called η phase) is formed on the surface of the base material. Etc.). The reason why the elements move in the HT-CVD method in this manner is that the coating temperature is high (usually 1000 ° C. to 1050 ° C.). In particular, regarding the transfer of carbon, in addition to the high temperature, the concentration of carbon between the film being formed and the surface of the base metal was increased due to insufficient supply of carbon from the gas phase during film formation. It is considered that there is a phenomenon in which a gradient occurs and the film absorbs carbon from the base material. On the other hand, MT-C
The VD method has a slightly low coating temperature (800 ° C to 900 ° C).
It is said that the η phase does not occur even at the interface of the ridgeline of the cutting edge because the supply of C and N from the gas phase is sufficient.

However, the present inventors have found that titanium carbonitride (T
While conducting research on a cemented carbide member coated with an (iCN) film, it became clear that the adhesion between the titanium carbonitride film by the MT-CVD method and the cemented carbide base material is often unstable. From the results of earnest analysis of this, the cause is cobalt (Co) which is a binder phase on the surface of the cemented carbide base metal due to chlorine gas generated as a reaction product during the formation of the titanium carbonitride film by the MT-CVD method. It was found that Co) was corroded (etched). Further, the thermal decomposition of an organic CN compound such as acetonitrile is easily affected by the chemical bonding state on the surface of the base material, and often free carbon is produced. The generation of such free carbon deteriorates the adhesion between the coating and the base material, and by combining with the generation of the interface-altered layer described above, the performance of the coated cutting tool by the MT-CVD method becomes unstable. It was there. Coating made of cemented carbide as a substrate and titanium carbide, titanium nitride or titanium carbonitride coated on its surface as a multilayer film. Cemented carbide as an innermost layer adjacent to the substrate made of titanium nitride of 0.1 to 1.0 μm. Cemented carbide is also disclosed (Japanese Patent Laid-Open No. 61-170559).
This publication relates to a film formed by the PVD method, and the influence of the chlorine content in the film and the crystal orientation is not examined.

The object of the present invention is to solve the above-mentioned problems in the prior art, have higher wear resistance than the conventional coated cutting tools, have a strong adhesion between the coating film and the base material, and are resistant to peeling during cutting. An object of the present invention is to provide a coated cutting tool having excellent properties and a manufacturing method thereof.

[0009]

Means for Solving the Problems The inventors of the present invention described above in a coated cutting tool having a coating layer in which the innermost layer in contact with the base material is titanium carbonitride or titanium nitride in contact with the base material and titanium carbonitride immediately above it. As a result of various studies to solve the problems, the chlorine content of the components forming the coating, especially titanium carbonitride in contact with the base material or titanium nitride in contact with the base material and titanium carbonitride immediately above it is less than or equal to a predetermined amount. Or, by setting the orientation of these titanium carbonitrides within a specific range, the wear resistance in cutting is greatly improved and the wear resistance of the film itself is improved, compared to conventional coated cutting tools. The inventors have found that the breaking strength of the film can be improved, the life of the tool can be stabilized and dramatically improved, and the present invention has been completed.

A first aspect of the present invention has a coating layer consisting of an inner layer and an outer layer on the surface of a base material made of tungsten carbide based cemented carbide, titanium carbonitride based cermet, silicon nitride based ceramics or aluminum oxide based ceramics, A single layer of titanium carbonitride whose inner layer is in contact with the base material, or a double layer of titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material and titanium carbonitride directly thereover, or further carbonitriding of the single layer or double layer Titanium carbide, nitride, carbonitride on titanium,
Boronitride, borocarbonitride is composed of multiple layers coated with one or more selected, the outer layer is aluminum oxide,
A coated cutting tool comprising one or more single layers or multiple layers selected from zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride, and a coating having the following constitutions (1) to (13) It is a cutting tool. (1) A coated cutting tool, wherein the chlorine content in the inner layer is 0.05 atom% or less on average in the entire inner layer. (2) The chlorine content of titanium carbonitride in contact with the base material of the inner layer, or the average chlorine content of titanium carbonitride having a thickness of 0.1 to 2 μm in contact with the base material and titanium carbonitride immediately above is 0.05 atom. % Or less, the coated cutting tool according to (1) above.

(3) X-ray diffraction angle 2θ = 20 ° to 140 in titanium carbonitride in contact with the base material or titanium carbonitride immediately above titanium nitride in contact with the base material and having a thickness of 0.1 to 2 μm.
Among the planes where the diffraction peak appears between the angles (°), the total diffraction peak intensity I (hkl) of the plane (hkl) having an interplanar angle with the (220) plane of 30 ° to 60 ° and the (220) plane Ratio of peak intensity I (220) I (hkl) / I (22
The value of 0) is 0 to 3 from the surface of the base material or the surface of titanium nitride.
2.5 ≦ I (hkl) / I (220) ≦ 7.0 on average up to μm,
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 2.5 ≦ I (hkl) / I (220) ≦ 15.0 on average. (4) In the case of titanium carbonitride in contact with the base material of the inner layer or titanium carbonitride just above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, an X-ray diffraction angle 2θ = 20 ° to 140 ° Of the planes in which the diffraction peak appears, the total I (hkl) of the diffraction peak intensities of the plane (hkl) having an interplanar angle with the (220) plane of 30 ° to 60 ° and the peak intensity I (of the (220) plane. The ratio of I (hkl) / I (220) to 220) is 2.5 ≦ I (hkl) / I (220) ≦ 7.0 on average from the base material surface or the titanium nitride surface to 0 to 3 μm. Yes,
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 2.5 ≦ I (hkl) / I (220) ≦ 15.0 on average, the coated cutting tool according to (1) or (2) above.

(5) The peak intensity of the (311) plane in the X-ray diffraction of titanium carbonitride in contact with the base material or titanium carbonitride immediately above titanium nitride in the thickness of 0.1 to 2 μm in contact with the base material is I ( 311), the peak intensity of the (220) plane is I
(220), the value of I (311) / I (220) is 0 to 3 μm from the surface of the base material or the surface of titanium nitride.
Up to 0.5 ≦ I (311) / I (220) ≦ 1.5,
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 0.5 ≦ I (311) / I (220) ≦ 6.0 on average. (6) The peak intensity I (311) of the (311) plane in X-ray diffraction in titanium carbonitride in contact with the base material of the inner layer or titanium carbonitride immediately above titanium nitride in thickness of 0.1 to 2 μm in contact with the base material ) And the peak intensity I (2) of the (220) plane
The value of the ratio I (311) / I (220) with 20) is 0.5 ≦ I (311) / I (220) ≦ 1.5 on average from 0 to 3 μm from the base material surface or the titanium nitride surface. And
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 0.5 ≦ I (311) / I (220) ≦ 6.0 on average, the coated cutting tool according to any one of (1) to (4) above.

(7) The peak intensity of the (111) plane in X-ray diffraction of titanium carbonitride in contact with the base material or titanium carbonitride immediately above titanium nitride in contact with the base material and having a thickness of 0.1 to 2 μm is I ( 111), the peak intensity of the (220) plane is I
(220), the value of I (111) / I (220) is 0 to 3 μm from the base material surface or the titanium nitride surface.
Up to 1.0 ≦ I (111) / I (220) ≦ 4.0,
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 1.0 ≦ I (111) / I (220) ≦ 8.0 on average. (8) In the case of titanium carbonitride in contact with the base material of the inner layer or titanium carbonitride just above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, the peak intensity I (111) of the (111) plane in X-ray diffraction ) And the peak intensity I (2) of the (220) plane
The value of the ratio I (111) / I (220) with respect to 20) is 1.0 ≦ I (111) / I (220) ≦ 4.0 on average from 0 to 3 μm from the surface of the base material or the surface of titanium nitride. Any of the above (1) to (6), characterized in that 1.0 ≦ I (111) / I (220) ≦ 8.0 on average from the base material surface or the titanium nitride surface to 0 to 20 μm. The coated cutting tool.

(9) The peak intensity of the (311) plane in the X-ray diffraction of titanium carbonitride in contact with the base material or titanium carbonitride immediately above titanium nitride in the thickness of 0.1 to 2 μm in contact with the base material is I ( 311), the peak intensity of the (111) plane is I
The peak intensities of the (111) and (220) planes are I (220)
Then, {I (111) + I (311)} / I (2
The value of 20) is 0 from the surface of the base material or the surface of titanium nitride.
2.0 ≦ {I (111) + I (311)} / I (22
0) ≦ 5.5, and 2.0 ≦ {I (111) + I (311)} / I (22 on average from 0 to 20 μm from the base material surface or titanium nitride surface.
0) ≤ 14.0, a coated cutting tool. (10) In the case of titanium carbonitride in contact with the base material of the inner layer or titanium carbonitride immediately above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, the peak intensity I (311) of the (311) plane in X-ray diffraction ), (111) plane peak intensity I
Peak intensity I (220) of (111) and (220) planes
Relational expression {I (111) + I (311)} / I (22
The value of 0) is 0 to 0 from the surface of the base material or the surface of titanium nitride.
2.0 ≦ {I (111) + I (311)} / I (22 on average up to 3 μm
0) ≦ 5.5, and 2.0 ≦ {I (111) + I (311)} / I (22 on average from 0 to 20 μm from the base material surface or titanium nitride surface.
0) ≦ 14.0, The coated cutting tool according to any one of (1) to (8) above.

(11) The titanium carbonitride in contact with the base material of the inner layer or the titanium carbonitride immediately above the titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material has a thickness of 1 to 20 μm. The coated cutting tool according to any one of (1) to (10) above. (12) The base material is a tungsten carbide-based cemented carbide or titanium carbonitride-based cermet, and the thickness of the η phase on the outermost surface of the interface between the coating layer and the base material at the cutting edge ridge is 1 μm or less. The coated cutting tool according to any one of (1) to (11) above. (13) The total thickness of the inner layer and the outer layer is 2 to 100 μm.
The coated cutting tool according to any one of (1) to (12) above.

In a second aspect of the present invention, a base material made of a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics has a coating layer consisting of an inner layer and an outer layer, A single layer of titanium carbonitride whose inner layer is in contact with the base material, or a double layer of titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material and titanium carbonitride directly thereover, or further carbonitriding of the single layer or double layer Titanium carbide, nitride, carbonitride on titanium,
Boronitride, borocarbonitride is composed of multiple layers coated with one or more selected, the outer layer is aluminum oxide,
In a method for producing a coated cutting tool comprising one or more single layers or multiple layers selected from zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride, the following (14) to (17) It is a manufacturing method of the coated cutting tool which has composition. (14) As a method for coating titanium carbonitride in contact with the base material or titanium carbonitride directly above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, titanium tetrachloride as a titanium source and organic as a carbon nitrogen source With a CN compound, nitrogen is 26
80% by the chemical vapor deposition method performed in an atmosphere having a concentration of not less than 80%.
A method of manufacturing a coated cutting tool, which comprises coating in a temperature range of 0 to 950 ° C. (15) As a method of coating titanium carbonitride in contact with the base material or titanium carbonitride directly on titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, titanium tetrachloride as a titanium source and organic as a carbon nitrogen source A method for producing a coated cutting tool, which comprises coating in a temperature range of 950 to 1050 ° C. by a chemical vapor deposition method using a CN compound. (16) As a method for coating titanium carbonitride in contact with the base material or titanium carbonitride directly above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, titanium tetrachloride as a titanium source and organic as a carbon nitrogen source With a CN compound, nitrogen is 26
80% by the chemical vapor deposition method performed in an atmosphere having a concentration of not less than 80%.
The method for producing a coated cutting tool according to any one of (1) to (13) above, wherein coating is performed in a temperature range of 0 to 950 ° C. (17) As a method of coating titanium carbonitride in contact with the base material or titanium carbonitride directly above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, titanium tetrachloride as a titanium source, and organic as a carbon nitrogen source The method for producing a coated cutting tool according to any one of the above (1) to (13), which comprises coating in a temperature range of 950 to 1050 ° C. by a chemical vapor deposition method using a CN compound.

[0017]

In the coated cutting tool of the present invention, by suppressing the chlorine content in the coating layer to an extremely small amount of 0.05 atom% or less on average in the inner layer, not only the tool life is dramatically improved but also stability is improved. It has become possible to improve dramatically. This is because, by reducing the amount of chlorine in the coating layer to this level, the hardness of the film is dramatically improved and the wear resistance of the film itself is significantly improved. This is because the adhesiveness at the interface between the base material and the film and the adhesiveness between the inner layer and the outer layer are remarkably improved, and wear does not progress due to peeling of these interfaces during cutting. In particular, regarding interfacial peeling during cutting, the exposure of the base metal due to the occurrence of peeling at the interface between the base material and the coating layer leads to a noticeable decrease in tool life and variation, so it is in direct contact with the base material in the inner layer as well. It is desirable to suppress the average amount of chlorine in titanium carbonitride or the average amount of chlorine between titanium nitride in contact with the base material and titanium carbonitride immediately above it to 0.05 atom% or less. The amount of chlorine in the film can be measured using an electron probe microanalyzer (EPMA) using AgCl as a standard sample.

Conventionally, as described above, there have been reports that the chlorine content level in the coating film is reduced to about 1 atomic% to obtain a good film quality, and that a titanium carbide coating having a two-layer structure having different chlorine contents is used. However, it has not been studied to reduce the chlorine content in the entire coating layer to a low level of 0.05 atomic% or less. The present invention can dramatically improve wear resistance and peel resistance at the interface between the base material and the film during cutting only by reducing chlorine in the entire coating layer to a level of 0.05 atomic% or less. It is based on the result of finding that In the present invention, low chlorine in this range is essential, and for the first time, a coating layer having higher hardness, excellent wear resistance, and excellent adhesion can be obtained.

The coated cutting tool of the present invention has a structure in which titanium carbonitride is directly coated directly on the base material in the inner layer, or a structure in which titanium nitride is coated 0.1 to 2 μm and titanium carbonitride is coated thereon. However, one of the effects of this is that the adverse effect of chlorine can be eliminated by stabilizing the nucleation during film formation. Titanium carbonitride and titanium nitride are very uniform because the nucleation during film formation is not significantly affected by the state of the base material. If the nucleation is non-uniform, chlorine generated by the reduction of titanium tetrachloride during the film formation reaction segregates at the interface between the base material and the coating layer, which causes the peeling resistance of the coating layer to decrease. When the base material is cemented carbide or cermet, the binder phase (cobalt, nickel, etc.) near the surface of the base material is corroded by chlorine, which reduces the strength near the surface of the base material and reduces the tool life. It causes a decrease. However, in the case of a structure in which titanium nitride is coated as a layer in contact with the base material, if the thickness of the titanium nitride is less than 0.1 μm, the titanium nitride film formation will be sufficiently uniform regardless of the base material position. However, the titanium carbonitride coated on it partially nucleated directly on the base metal, and the nucleation of titanium nitride and titanium carbonitride was mixed on the base metal. This results in a non-uniform state, and as a result, the effect of eliminating the adverse effects of chlorine is not sufficiently exhibited. On the other hand, if it exceeds 2 μm, it adversely affects the wear resistance during cutting. Therefore, as a film in contact with the base material, a structure in which titanium carbonitride is directly coated or a thickness of 0.
It is necessary to form a structure in which titanium nitride having a thickness of 1 to 2 μm is coated, and titanium carbonitride is further coated thereon.

When a titanium nitride film is formed directly on the base material, the grain size of the film can be made extremely fine by setting appropriate conditions, and accordingly, the grain size of the titanium carbonitride film formed thereon tends to be fine. It is in. Also, MT-CV
When forming a titanium carbonitride film by the D method, if the gas conditions are kept constant, the carbon content near the surface will differ due to the difference in the carbon content of the base alloy and the difference in the decarburization quantity near the surface during sintering. When the alloy is used as the base material, free carbon may be precipitated near the interface, but such an effect is mitigated by interposing the titanium nitride film.

Further, in the coated cutting tool of the present invention, the orientation of the titanium carbonitride layer directly above the titanium nitride which is in contact with the base material of the inner layer or the titanium carbonitride layer which is in direct contact with the base material is kept within a specific range. Is also one of the features. As described above, the coating of titanium carbide or the like by the thermal CVD method tends to be oriented in the (220) plane which is the primary sliding surface, and there is a problem that the film is easily broken during processing as a tool. In the present invention, titanium carbonitride immediately above titanium nitride in contact with the base material or I (h in titanium carbonitride in contact with the base material
The value of kl) / I (220) is X-ray diffraction angle 2θ = 20 °
Of the planes where the diffraction peak appears between ~ 140 °, (22
The surface (hk) having an angle between the surface and the (0) surface of 30 ° to 60 °
l) total diffraction peak intensity I (hkl), and (22)
It is the ratio with the peak intensity I (220) of the (0) plane. The inter-plane angle φ with the (220) plane is expressed by the following formula since titanium carbonitride has a cubic crystal structure.

[0022]

## EQU1 ## cos φ = (2 × h + 2 × k) / {2 ^3/2 ×
(H ² + k ² + l ² ) ^1/2 }

That is, I (hkl) = I (hkl) =
I (111) + I (200) + I (311) + I (42
(2) + I (511) means ((222) plane is (11
1) Except as it is equivalent to a face). It is the primary sliding surface (2
20) The orientation of the plane (30 ° to 60 °) tilted with respect to the plane is expressed as an X-ray intensity ratio from the base material surface or the titanium nitride surface to 0.
2.5 ≦ I for both average of ˜3 μm and average of 0-20 μm
It is necessary to control to be (hkl) / I (220), which makes the strength against shearing during cutting very strong. Further, if the orientation is too strong at the initial stage of forming the coating layer, the nucleation on the surface of the underlayer is affected in this case as well, and the adhesion is deteriorated. Therefore, the orientation of the (hkl) plane is And I (hkl) / on average at a position of 0 to 3 μm in thickness from the base material surface or the titanium nitride surface.
It is necessary to control the range of I (220) ≦ 7.0 and the range of I (hkl) / I (220) ≦ 15.0 on the average at the position of thickness of 0 to 20 μm. In the cutting tool of the present invention, in the titanium carbonitride directly on the titanium nitride in contact with the base material in the range of 0 to 3 μm and 0 to 20 μm from the surface of the base material or the surface of titanium nitride, or in the titanium carbonitride in contact with the base material (hkl ) By controlling the orientation of the surface within the above range, it is possible to improve the adhesion at the interface with the underlayer and at the same time suppress damage to the film itself during cutting. Further, the above effect is further enhanced by controlling the orientation of titanium carbonitride immediately above titanium nitride in contact with the base material or titanium carbonitride in contact with the base material in the range shown below.

In the present invention, the value of I (311) / I (220)) in titanium carbonitride immediately above titanium nitride in contact with the base material or in titanium carbonitride in contact with the base material is the same as the (311) plane in X-ray diffraction. The intensity ratio of the peak of (220) is taken, and the intensity ratio of X-rays in the unoriented titanium carbonitride powder is I (311) / I (220) =
Since it is 0.5, 0.5 or more, which is the range of the present invention,
This means that the (311) plane is more oriented than the (220) plane. (311) surface is about 32 ° to the primary sliding surface
And the orientation of this surface has an X-ray intensity ratio of 0.5 ≦ I (311) / I for the average of 0 to 3 μm and 0 to 20 μm from the base material surface or titanium nitride surface.
It is necessary to control to (220), which makes the strength against shearing during cutting very strong. On the contrary, if the orientation of the coating layer is too strong at the initial stage of forming the coating layer, the nucleation on the surface of the underlayer is affected in this case as well, and the adhesion is deteriorated. Therefore, the orientation of the (311) plane is X. The linear intensity ratio of I (311) / I (220) ≦ 1.
5, and I (311) / I (22
It is necessary to control within the range of 0) ≦ 6.0. In the cutting tool of the present invention, the degree of adhesion at the interface between the film and the base material is improved by controlling the orientation of the (311) plane of the titanium carbonitride layer of 0 to 3 μm and 0 to 20 μm within the above range. At the same time, it became possible to suppress damage to the film itself during cutting.

In the present invention, the peak intensities of the (111) plane in X plane diffraction are I (111) and (220).
When the peak strength of the surface is I (220), the value of I (111) / I (220) in titanium carbonitride immediately above titanium nitride in contact with the base material or in titanium carbonitride in contact with the base material is 0 to 3 μm. Up to 1.0 ≦ I (111) / I (2
20) ≦ 4.0 and an average of 0 to 20 μm 1.0 ≦ I (111) / I
It is characterized in that (220) ≦ 8.0. 0 to
By controlling the orientation of the titanium carbonitride directly on titanium nitride in contact with the base material of the inner layer in the range of 3 μm and 0 to 20 μm, or the (111) plane of the titanium carbonitride layer in contact with the base material within the above range, As in the case of being oriented to the (311) plane, it is possible to suppress damage to the film itself during cutting.

Further, this effect is obtained by averaging 2.0 ≦ {I (111) + I (311)} / I (22 from the base material surface or the titanium nitride surface to 0 to 3 μm.
0) ≦ 5.5, and on average from 0 to 20 μm 2.0 ≦ {I (111) + I (311)} / I (22
0) ≦ 14.5, that is, it is increased by orienting in the (311) and (111) planes which are the planes inclined with respect to the (220) plane.

However, if the film thickness exceeds 20 μm and 6.0 <
I (311) / I (220), 8.0 <I (111) /
I (220) or 14.0 <{I (111) + I (3
11)}, the orientation is too strong this time, which affects the nucleation state when coating the outer layer and leads to peeling at the interface of the coating layer during processing, which is not preferable. Further, if the orientation of the coating layer is too strong in the initial stage of the coating layer formation, in this case also affects the nucleation of titanium carbonitride on the underlayer, and a decrease in the degree of adhesion at these interfaces occurs, The orientation of the (311) plane is an average of I (311) / I (220) ≦ 1.5, I (111) / I (220) ≦ 4.0, or {I (111) in terms of X-ray intensity ratio. ) + I (311)} / I (220) ≦ 5.
It is necessary to control to 5.

If the thickness of the titanium carbonitride immediately above titanium nitride in contact with the base material or the titanium carbonitride coating layer in contact with the base material is less than 1 μm, the effect of preventing damage in the film near the interface is small. If it exceeds 20 μm, the orientation becomes too strong as described above,
20 μm is a preferable range.

Note that each of I (hkl) / I (220), etc.
A tube of Cr, V, etc. is used as the method for obtaining the surface strength.
The conventional X-ray diffraction method is used. However, if it is coated with cemented carbide,
X-ray peak intensity at relatively thin position of covered titanium carbonitride
X-rays penetrate into the base metal when determining the degree of carbonization.
Longsten (WC) peak appears, but carbonized tongs
The peak of the (111) plane of Ten and the (31) of titanium carbonitride
1) Since the peak positions of the planes overlap, the separation of these
Cannot be performed (using a V tube that allows the peaks to be separated most easily)
Can not be separated). From this, of tungsten carbide
Using powder diffraction pattern (for the base material tungsten carbide
There is usually no orientation), the strongest peak of tungsten carbide
Peak ratio of (101) and (111) planes (ASTM
From I _{0 WC}(101) / I_{0 WC}(111) = 0.2
5) to I_WCFind (111) (I _WC(111) = 0.
25 x I_WC(101)) at the position of (311)
I (311) is obtained by subtracting from the peak intensity.

The effect of coating titanium nitride as a layer in contact with the base material in an amount of 0.1 to 2 μm is, in addition to the above-mentioned effect of removing chlorine from adverse effects, stabilization of nucleation during film formation of titanium nitride (nucleation). Is not very affected by the state of the base material, and is very dense and uniform), and the effect of controlling the orientation of the titanium carbonitride thereon can be mentioned. Thereby, the orientation of titanium carbonitride can be stably controlled within the range of the present invention regardless of the type, composition, surface state, etc. of the base material. However, if the thickness is less than 0.1 μm, this effect is not sufficiently exhibited, and it is difficult to control the orientation, and if it is 2 μm or more, the wear resistance during cutting is adversely affected. Therefore, the thickness of titanium nitride must be in the range of 0.1 to 2 μm.

As in the cutting tool of the present invention, the chlorine content in the coating layer is 0.05 atomic% or less, and / or titanium carbonitride immediately above titanium nitride in contact with the base material in X-ray diffraction, or the base material. The ratio of the peak strength of titanium carbonitride in contact with is within the above range, the adhesion to the base is strong, wear resistance, preferred manufacturing method for forming a titanium carbonitride coating film excellent in peeling resistance There is a method of forming a coating layer of titanium carbonitride in a temperature range of 950 to 1050 ° C. by a chemical vapor deposition method using titanium tetrachloride as a Ti source and an organic CN compound as a carbon nitrogen source. This 950-10
The film forming temperature range of 50 ° C. is a high temperature range which is almost the same as that of the conventional thermal CVD method using methane or nitrogen as a carbon-nitrogen source, but such a high temperature using the raw material of the present invention. There have been no previous reports of studies in the field.

When the coating layer is formed by the conventional thermal CVD method in the temperature range of 950 to 1050 ° C., the η phase is thickly deposited on the ridge line of the cutting edge depending on the kind of the base material, and the η phase and the coating phase are formed during cutting. Although the tool life was likely to decrease due to the loss of the CNT, in the present invention, by using an organic CN compound as the carbon-nitrogen source, even in the coating in this temperature range, the thickness of the η phase of the cutting edge portion Can be controlled to an extremely small amount of 1 μm or less. This is one of the advantageous features of the present invention. Further, by coating titanium carbonitride with an organic CN compound in such a temperature range, wear resistance, fracture resistance in the coating layer,
It has become possible to form a titanium carbonitride coating that has excellent adhesion at the interface between the base material and the coating layer. Conventionally, if titanium nitride is coated thickly, the wear resistance decreases, so titanium nitride (TiN) is thinly coated at a relatively low temperature side to a film thickness range of up to about 2 μm, which does not adversely affect wear resistance, Even if an attempt is made to suppress the precipitation of the η phase, there is a problem that the η phase will be precipitated if titanium carbonitride (TiCN) or the like is coated thereon by using a thermal CVD method. On the other hand, according to the present invention, the thickness of titanium nitride in contact with the base material is set within a range of 0.1 to 2 μm, and titanium carbonitride is coated thereon with an organic CN compound at a higher temperature than in the conventional case. It was found that even if the thickness is 0.1 to 2 μm, the generation of the η phase can be suppressed to a considerable level despite the formation of the titanium carbonitride coating.

Another feature of the method of the present invention is that the titanium carbonitride is coated with an organic CN compound in the temperature range of the present invention to improve wear resistance and fracture resistance in the coating layer. This is the point that enables the production of extremely excellent titanium carbonitride. The chemical vapor deposition method using an organic CN compound has been carried out in the past, but it is possible to avoid the precipitation of η phase because it is possible to coat titanium carbonitride at a relatively low temperature side. It is considered to be a characteristic of the process, and it is generally performed at a low temperature side of about 800 to 900 ° C. However, coating in such a temperature range could produce only a coating layer having a large amount of chlorine in the coating layer and low hardness of the film itself, and low abrasion resistance. In addition, such coating on the low temperature side causes insufficient peeling resistance of the film. On the contrary, when the temperature on the high temperature side exceeds 1050 ° C, organic C
When coating is performed using an N compound, the η phase on the surface of the base metal at the cutting edge ridge is thickly deposited and the orientation is strong on the (220) plane, as in the case of a normal thermal CVD method. In this study, it became clear that the fracture of the film and the removal of the coating phase from the η phase lead to a reduction in the tool life. Therefore, good film quality can be obtained in the film forming temperature range of 950 to 1050 ° C. of the present invention. However, by setting the amount of N ₂ in the mixed gas to be 26% or more, it is possible to obtain a film with medium fracture resistance and high adhesion, which has an orientation within the range of the present invention even at a low temperature of about 800 to 950 ° C. Became possible.

The above-mentioned method of the present invention makes it possible to improve the adhesion strength of the coating film (the adhesion between the base material and the inner layer and the adhesion between the inner layer and the outer layer) and the fracture resistance of the coating layer during cutting. Therefore, while the thickness of the coating layer of the conventional coated cutting tool is about 10 to 15 μm at most, according to the present invention, a much thicker film up to 100 μm is peeled off or broken in the film. It was confirmed that the product could be used without causing. However, if it exceeds 100 μm, breakage in the coating layer often occurs due to processing with a small feed rate, which is not preferable. Further, in the case of a thick film coating layer having a thickness of more than 15 μm, it is particularly effective to combine it with a treatment for reducing the tensile residual stress in the coating layer after coating. After this treatment, the tensile residual stress in the coating layer is increased by increasing the number of cracks in the thickness direction of the coating layer as compared with the state after coating by applying mechanical impact or thermal impact to the coating layer surface after coating. Is effective in improving the fracture resistance of the coating layer, and is particularly effective in machining such as light cutting in which the burden on the coating layer is large. The present invention will be specifically described below with reference to examples.

[0035]

【Example】

(Example 1) Using a tungsten carbide based cemented carbide in the form of CNMG120408 of ISO P10 as a base material,
A coating layer having a structure shown in Tables A1 to H1, P1, Q1, and R1 was formed on this surface. At this time, the formation of titanium nitride in contact with the base material of the inner layer is 950 ° C., titanium tetrachloride: 1%,
It was carried out in a mixed gas flow of nitrogen (N ₂ ): 50% and hydrogen (H ₂ ): 49%. The generation of titanium carbonitride in the inner layer is performed at each temperature of 900 to 1100 ° C. shown in Table 1, and the gas conditions are all H ₂ : 95%, titanium tetrachloride: 4%, acetonitrile (CH ₃ CN): 1 to 3%. , In a furnace at a pressure of 60 Torr in a mixed gas flow. The thickness of the coating layer was adjusted by changing the holding time. Table 2 shows the amount of chlorine in the film of these invention products, the orientation, and the precipitation thickness of the η phase at the cutting edge ridge. For comparison, the same film structure as that of the product A1 of the present invention was used, and the titanium carbonitride of the inner layer was formed by the conventional thermal CVD method using methane and nitrogen (N ₂ ) as carbon nitrogen sources.
Comparative product I produced at 000 ° C. is also shown in the table. The amount of chlorine in the film was measured by EPM using AgCl as a standard sample.
Measured by A.

Using these samples, the abrasion resistance of the film itself, the abrasion resistance including the film exfoliation, and the exfoliation damage were evaluated under the following cutting conditions 1 and 2. The results are shown in Table 3. From these results, A1 to H1 and P of the product of the present invention
It can be seen that 1, Q1 and R1 are superior to Comparative Product I in terms of wear resistance, peeling resistance, and in-film fracture resistance. Among the products of the present invention, G1 has a large amount of residual chlorine in the film, and is slightly inferior in wear resistance and peeling resistance, but its in-film fracture resistance is larger than that of Comparative product I. Is improved, which is an effect that the orientation is within the scope of the present invention.
Further, in the H1 of the present invention, the orientation of (311) is weak,
Although the fracture resistance in the film is slightly inferior, the wear resistance is greatly improved as compared with Comparative Product I, and the effect of keeping the amount of residual chlorine in the film within the range of the present invention is recognized. Incidentally, it is considered that in H1, the peeling resistance of the coating layer is slightly inferior despite the small amount of chlorine in the film, due to the thickness of the η layer. Also, P
From the results of 1 and R1, the effect that the orientation of (111) is within the range of the present invention, and from the result of Q1 (311)
It can be seen that the effect on the breakdown in the film due to the orientation of is within the range of the present invention.

Cutting condition 1 Work material: SCM415 (HB = 210) Cutting speed: 300 m / min Feed: 0.35 mm / rev Depth of cut: 1.5 mm Cutting time: 30 minutes Cutting oil: Water soluble Cutting condition 2 Work material : SCM415 (HB = 180) Cutting speed: 250 m / min Feed: 0.3 mm / rev Depth of cut: 1.5 mm Cutting time: Repeated 300 times at 1 pass = 10 seconds Cutting oil: Water-soluble

[0038]

[Table 1]

[0039]

[Table 2]

[0040]

[Table 3]

(Example 2) CNMG1 of ISO P10
A titanium carbonitride-based cermet having a shape of 20408 was used as a base material, and A1, C1, E1, P1, and
A coating layer having the same structure as Q1 was produced, and samples A2 and C were used.
2, E2, P2, Q2 were prepared, and the conditions 1 and 2 of Example 1 were
Evaluation was performed under the same cutting conditions as above. The results are shown in Table 4. For comparison, the results of evaluation of Sample I2 in which a cermet base material is coated with a coating having the same film structure as A1 in Table 1 at 1000 ° C. by a conventional thermal CVD method are also shown. In addition,
The film thickness, the chlorine content, and the orientation of these films were the same as the results shown in Tables 1 and 2, but no η phase was found in the cutting edge ridge portion in any of the samples (I2 sample only, coating There was some precipitation of the metallic phase, which is believed to be due to Ni of the binder, in the layer). From these results, in the comparative product I2, the amount of chlorine in the inner layer and the amount of chlorine in the titanium nitride in contact with the base material and the titanium carbonitride immediately thereabove are large, so that the wear resistance of the film itself is insufficient and the film peels off. Since the orientation of the titanium carbonitride layer is out of the range of the present invention, the film is broken in the coating layer. On the other hand, A of the present invention product
2, C2, E2, P2, Q2 wear resistance, peeling resistance,
It can be seen that the results show that the in-film fracture resistance is excellent.

[0042]

[Table 4]

(Embodiment 3) A silicon nitride ceramic having a shape of CNMG120408 is used as a base material, and a coating layer having the same structure as A1, C1, E1, P1, and Q1 in Table 1 is formed on this surface, and a sample A3 is formed. C3, E3, P3, Q3
Was prepared and evaluated under the cutting conditions 3 and 4 shown below. The results are shown in Table 5. As a comparison, the results of evaluating the sample I3 in which the coating film having the same film structure as A1 in Table 1 is coated on the silicon nitride ceramic base material at 1000 ° C. by the conventional thermal CVD method are also shown. The chlorine content and orientation of these films were the same as the results shown in Tables 1 and 2, but no η phase was observed at the cutting edge line portion in any of the samples. Regarding the film thickness, only the thickness of the titanium carbonitride in the inner layer of I3 is 6μ.
m was the same, but otherwise the results were the same as in Table 1.
From these results, in the comparative product I3, the amount of chlorine in the inner layer and the amount of chlorine in the titanium nitride in contact with the base material and the titanium carbonitride immediately thereabove are large, so that the abrasion resistance of the film itself is insufficient and the film peels off. Since the orientation of titanium carbonitride is out of the range of the present invention, the film is broken in the coating layer. On the other hand, A3, C3, E3, P3 of the product of the present invention
It can be seen that Q3 has excellent wear resistance, peeling resistance, and in-film fracture resistance.

Cutting condition 3 Work material: FC25 Cutting speed: 500 m / min Feed: 0.25 mm / rev Cutting depth: 1.5 mm Cutting time: 30 minutes Cutting oil: None Cutting condition 4 Work material: FC25 Cutting speed: 400 m / Min Feed: 0.3 mm / rev Depth of cut: 1.5 mm Cutting time: 1 pass = 10 seconds repeated 300 times Cutting oil: None

[0045]

[Table 5]

(Embodiment 4) Using aluminum oxide based ceramics in the shape of CNMG120408 as a base material,
A coating layer having the same structure as A1, C1, E1, P1, Q1 in Table 1 was formed on this surface, and samples A4, C4, E4, P
4 and Q4 were prepared and evaluated under the same cutting conditions as the cutting conditions 3 and 4 of Example 3. The results are shown in Table 6. For comparison, a film having the same film structure as A1 in Table 1 is formed by conventional thermal CVD.
The results of evaluating the sample I4 coated on the aluminum oxide-based ceramic base material at 1000 ° C. by the method are also shown. The chlorine content and orientation of these films were the same as the results shown in Tables 1 and 2, but no η phase was observed at the cutting edge line portion in any of the samples. Regarding the film thickness, I4
Only the thickness of titanium carbonitride in the inner layer was 6 μm, but other than that, it was the same as the result in Table 1. From these results, in Comparative Product I4, the amount of chlorine in the inner layer and the amount of chlorine in the titanium nitride in contact with the base material and the amount of chlorine in the titanium carbonitride immediately thereabove are both large. And the orientation of the titanium carbonitride layer deviates from the scope of the present invention, resulting in the destruction of the film in the coating layer. On the other hand, the products A4, C4 and E of the present invention
4, P4 and Q4 have excellent wear resistance, peeling resistance and in-film fracture resistance.

[0047]

[Table 6]

Example 5 ISO P30 CNMG1
A tungsten carbide-based cemented carbide having a shape of 20408 is used as a base material, and the surface thereof is heated to 1000 ° C. under the same gas conditions as in Example 1.
Samples J1 to L1 of the present invention having a thick film structure as shown in Table 7 were prepared by performing coating in the above. Further, a sample J2 in which the post-coating sample J1 was subjected to shot peening treatment using iron powder to reduce the tensile residual stress in the coating layer to zero was also produced at the same time. Further, for comparison, comparative products M, N, each having a film thickness exceeding the range of the present invention,
Also shown in the table is a comparative product O in which the inner layer of titanium carbonitride was coated with the same thickness as the product of the present invention at 1000 ° C. by the conventional thermal CVD method using C and N ₂ as carbon and nitrogen sources. Table 8 shows the amounts of chlorine in the films of these samples, the orientation of titanium carbonitride immediately above the titanium nitride in contact with the base material, and the η phase precipitation thickness at the ridge of the cutting edge. Table 9 shows the results of machining using these samples under the cutting conditions 5 and 6 shown below. From these results, it is found that in Comparative Sample M, the inner layer of titanium carbonitride has a large film thickness and the orientation exceeds the range of the product of the present invention, so that peeling occurs in the coating layer and wear progresses. Recognize. Further, in the comparative sample N, since the total film thickness exceeds the range of the product of the present invention, it can be seen that the breakdown in the coating layer is large. Further, it can be seen that the comparative sample O by the conventional thermal CVD method cannot be used at all. From the comparison of J1 and J2 of the product of the present invention, it is found that the treatment of removing the residual stress after coating in such a thick film region is effective in improving the peeling resistance and the in-film fracture resistance. I understand.

Cutting condition 5 Work material: SCM415 (HB = 210) Cutting speed: 500 m / min Feed: 0.20 mm / rev Depth of cut: 1.5 mm Cutting time: 30 minutes Cutting oil: Water soluble Cutting condition 6 Work material : SCM415 (HB = 180) Cutting speed: 600 m / min Feed: 0.15 mm / rev Depth of cut: 1.5 mm Cutting time: Repeated 150 times with 1 pass = 10 seconds Cutting oil: Water-soluble

[0050]

[Table 7]

[0051]

[Table 8]

[0052]

[Table 9]

(Example 6) CNMG1 of ISO P10
A tungsten carbide-based cemented carbide having a shape of 20408 was used as a base material, and a1 to h1 and p1 to r of Table 10 were formed on the surface of the base material.
A coating layer having the structure shown in 1 was produced. At this time, the formation of titanium carbonitride of the first layer is 900 to 1100 ° C. shown in Table 10.
And the gas conditions are H ₂ : 95%, titanium tetrachloride: 4%, acetonitrile (CH ₃ CN): 2
%, The furnace pressure was 60 Torr in a mixed gas flow.
The thickness of the coating layer was adjusted by changing the holding time. Table 11 shows the amount of chlorine in the film of these invention products, the orientation, and the η phase precipitation thickness at the cutting edge ridge. As a comparison, a comparative product i having the same film structure as that of the product a1 of the present invention and prepared by using the conventional thermal CVD method using methane and N ₂ as the carbon monoxide source for the first layer of titanium carbonitride at 1000 ° C. It is shown in the table at the same time.

Using these samples, the abrasion resistance of the film itself, the abrasion resistance including the film exfoliation, and the exfoliation damage were evaluated under the cutting conditions 7 and 8 shown below. The results are shown in Table 12
Shown in. From these results, a1 to h1 of the product of the present invention,
It can be seen that p1 to r1 are more excellent in wear resistance, peeling resistance, and in-film fracture resistance than the comparative product i. Among the products of the present invention, g1 has a large amount of residual chlorine in the film, and the wear resistance and peeling resistance are slightly inferior, but the in-film fracture resistance is larger than that of the comparative product i. Is improved, which is an effect that the orientation is within the scope of the present invention. Further, in the h1 of the present invention, the orientation of (311) is weak and the fracture resistance in the film is slightly inferior, but the wear resistance is greatly improved compared to the comparative product i, and the residual chlorine content in the film is The effect within the range is recognized. Incidentally, it is considered that the peeling resistance of the coating layer is slightly inferior for h1 even though the amount of chlorine in the film is small, due to the thickness of the η layer.

Cutting condition 7 Work material: SCM415 (HB = 210) Cutting speed: 300 m / min Feed: 0.35 mm / rev Cutting depth: 1.5 mm Cutting time: 30 minutes Cutting oil: Water soluble Cutting condition 8 Work material : SCM415 (HB = 180) Cutting speed: 250 m / min Feed: 0.3 mm / rev Depth of cut: 1.5 mm Cutting time: Repeated 300 times at 1 pass = 10 seconds Cutting oil: Water-soluble

[0056]

[Table 10]

[0057]

[Table 11]

[0058]

[Table 12]

(Example 7) CNMG1 of ISO P10
Using a titanium carbonitride-based cermet having a shape of 20408 as a base material, a coating layer having the same structure as a1, c1 and e1 in Table 10 was formed on this surface to prepare samples a2, c2 and e2, and The evaluation was performed under the same cutting conditions as the conditions 7 and 8. The results are shown in Table 13. For comparison, a film having the same film structure as a1 in Table 10 was formed by the conventional thermal CVD method.
The results of evaluating the sample i2 coated on the cermet base material at 00 ° C are also shown. The film thickness, chlorine content, and orientation of these films were the same as the results shown in Tables 10 and 11, but no η phase was observed in the cutting edge ridges in any of the samples (i2 sample only). , Ni as a binder in the coating layer
There was a slight precipitation of the metal phase, which is thought to be due to the above).
From these results, in the comparative product i2, since the chlorine content of the inner layer and the first layer is large, the abrasion resistance of the film itself is insufficient and the film peels off, and the orientation of the first layer is out of the range of the present invention. Therefore, the film is broken in the coating layer. On the other hand, a2, c2, and e2 of the product of the present invention have wear resistance,
It can be seen that both the peeling resistance and the in-film fracture resistance are excellent.

[0060]

[Table 13]

(Embodiment 8) A silicon nitride ceramic having a shape of CNMG120408 is used as a base material, and a coating layer having the same structure as a1, c1 and e1 in Table 10 is formed on this surface, and samples a3, c3 and e3 are formed. It was produced and evaluated under the cutting conditions 9 and 10 shown below. The results are shown in Table 5.
As a comparison, the results of evaluating the sample i3 in which the film having the same film structure as a1 in Table 10 is coated on the silicon nitride ceramic base material at 1000 ° C. by the conventional thermal CVD method are also shown. The chlorine content and orientation of these films are shown in Tables 10 and 11.
However, no η phase was observed at the ridgeline of the cutting edge in any of the samples. Regarding the film thickness, only the thickness of titanium carbonitride of the first layer of i3 was 6 μm, but other than that, it was the same as the result of Table 10. From these results, in the comparative product i3, since the inner layer and the first layer have a large amount of chlorine, the abrasion resistance of the film itself is insufficient and the film is peeled, and the orientation of the first layer is out of the range of the present invention. Therefore, the film is broken in the coating layer. On the other hand, it can be seen that the products a3, c3, and e3 of the present invention have excellent wear resistance, peeling resistance, and in-film fracture resistance.

Cutting condition 9 Work material: FC25 Cutting speed: 500 m / min Feed: 0.25 mm / rev Cutting depth: 1.5 mm Cutting time: 30 minutes Cutting oil: None Cutting condition 10 Work material: FC25 Cutting speed: 400 m / Min Feed: 0.3 mm / rev Depth of cut: 1.5 mm Cutting time: 1 pass = 10 seconds repeated 300 times Cutting oil: None

[0063]

[Table 14]

(Embodiment 9) Using aluminum oxide based ceramics in the shape of CNMG120408 as a base material,
A coating layer having the same structure as a1, c1, and e1 in Table 10 was formed on this surface to prepare samples a4, c4, and e4, and evaluation was performed under the same cutting conditions as the cutting conditions 9 and 10 of Example 8. The results are shown in Table 15. For comparison, a in Table 10
100 by the conventional thermal CVD method
The results of evaluating the sample i4 coated with the aluminum oxide-based ceramic base material at 0 ° C. are also shown. The chlorine content and orientation of these films were the same as the results shown in Tables 10 and 11, but no η phase was observed at the ridge of the cutting edge in any of the samples. Regarding the film thickness, only the thickness of the titanium carbonitride of the first layer of i4 was 6 μm, but other than that, it was the same as the result of Table 10. From these results, since the comparative product i4 has a large amount of chlorine in the inner layer and the first layer, the tip and the film are peeled off due to the lack of abrasion resistance of the film itself, and the orientation of the first layer is the present invention. Since it is out of the range, the film is broken in the coating layer. On the other hand, it can be seen that the products a4, c4, and e4 of the present invention have excellent wear resistance, peeling resistance, and in-film fracture resistance.

[0065]

[Table 15]

(Example 10) ISO P30 CNMG
A tungsten carbide-based cemented carbide having a shape of 120408 was used as a base material, and the surface thereof was subjected to 1000 under the same gas conditions as in Example 6.
Samples j1 to l1 of the present invention having a thick film structure as shown in Table 16 were prepared by coating at a temperature of ℃. Further, a sample j2 in which the post-coating sample j1 was subjected to shot peening treatment using iron powder to reduce the tensile residual stress in the coating layer to zero was also prepared at the same time. Also,
For comparison, the comparative products m and n whose film thickness exceeds the range of the present invention, and the titanium carbonitride of the first layer were formed at 1000 ° C. by a conventional thermal CVD method using C and N ₂ as carbon and nitrogen sources. A comparative product o coated with the same thickness as the invention product is shown in the table at the same time. Table 1 shows the amounts of chlorine in the films of these samples, the orientation of the titanium carbonitride of the first layer, and the η phase precipitation thickness at the ridge of the cutting edge.
7 shows. Table 18 shows the results of processing using these samples under the cutting conditions 11 and 12 shown below. From this result, in Comparative Sample m, the thickness of the titanium carbonitride of the first layer is large and the orientation exceeds the range of the product of the present invention, so that peeling occurs in the coating layer and wear progresses. I understand. Further, in the comparative sample n, it can be seen that the total film thickness exceeds the range of the product of the present invention, so that the breakdown in the coating layer is large. Further, it can be seen that the comparative sample o by the conventional thermal CVD method cannot be used at all. From the comparison between j1 and j2 of the product of the present invention, it is effective to improve the peeling resistance and the in-film fracture resistance in the treatment of removing the residual stress after coating in such a thick film region. I understand.

Cutting condition 11 Work material: SCM415 (HB = 210) Cutting speed: 500 m / min Feed: 0.20 mm / rev Depth of cut: 1.5 mm Cutting time: 30 minutes Cutting oil: Water soluble Cutting condition 12 Work material : SCM415 (HB = 180) Cutting speed: 600 m / min Feed: 0.15 mm / rev Depth of cut: 1.5 mm Cutting time: Repeated 150 times with 1 pass = 10 seconds Cutting oil: Water-soluble

[0068]

[Table 16]

[0069]

[Table 17]

[0070]

[Table 18]

(Embodiment 11) ISO P20 CNMG
A tungsten carbide-based cemented carbide having a shape of 120408 was used as a base material, and TiN (0.5 μm) / Al was formed on this surface.
₂ O ₃ (2.0 μm) / TiBCN (0.5 μm) / T
Samples X1 to X5 and TiN (0.5 μm), which produced a coating layer of a structure composed of iC (3 μm) / TiCN (6 μm) / base material (TiN of the upper layer and Al ₂ O ₃ layer were outer layers)
/ Al ₂ O ₃ (2.0 μm) / TiBCN (0.5 μm
m) / TiC (3 μm) / TiCN (6 μm) / TiN
(0.5 μm) / structure consisting of base material (TiN and A in the upper layer)
Sample Y1 having a coating layer of which the 1 ₂ O ₃ layer is the outer layer)
Y5 was produced. Here, Ti in contact with the base materials of Y1 to Y5
The generation of N was performed at 900 ° C. in a mixed gas flow of titanium tetrachloride 1%, nitrogen (N ₂ ) 50%, and hydrogen (H ₂ ). Further, the formation of titanium carbonitride in the inner layers in X1 to X5 and Y1 to Y5 is 800, 85, respectively, in the order of numbers.
At a temperature of 0, 900, 940 and 1050 ° C., titanium tetrachloride is 4%, N ₂ is 26 to 60%, acetonitrile is changed to 0.4 to 1%, and the rest is H ₂ in a mixed gas stream. I went there. The thickness of the coating layer was adjusted to the above-mentioned film thickness by changing the holding time. The inner layer of TiCN
And the average amount of chlorine in TiN is X1 to X4 and Y1 to Y4.
Was 0.1 to 0.15%, and X5 and Y5 were 0.05% or less. Table 19 shows the orientation in the film of these products of the present invention. Further, in the same film structure, the production conditions of TiCN were acetonitrile 0.1%, 790 ° C., N ₂ was 0%, and comparative samples Z1 (same film structure as X1 to X5) and Z2 produced under the same conditions as above. (Y1 to Y5
Table 19 also shows the orientation of the film having the same film structure). In addition,
In both Z1 and Z2, the amount of chlorine in TiCN and TiN is 0.
It was over 2%. Table 20 shows the results of processing using these samples under the cutting conditions 13 and 14.
From this result, X1 to X5 and Y1 to Y5 of the product of the present invention are Z
Compared with 1 and Z2, the balance of abrasion resistance, peeling resistance, and in-film fracture resistance is greatly improved, and the effect of controlling the orientation within the scope of the present invention is clear.

Cutting condition 13 Work material: SCM435 (HB = 230) Cutting speed: 160 m / min Feed: 0.35 mm / rev Cutting depth: 1.5 mm Cutting time: 30 minutes Cutting oil: Water-soluble Cutting condition 14 Work material : SCM415 (HB = 140) Cutting speed: 350m / min Feed: 0.35mm / rev Depth of cut: 1.5mm Cutting time: Repeated 500 times with 1pass = 10 seconds Cutting oil: Water-soluble

[0073]

[Table 19]

[0074]

[Table 20]

(Example 12) CNMG of ISO P10
A titanium carbonitride-based cermet having a shape of 120408 was used as a base material, and X1, X4, Y1, and Y of Table 19 were formed on this surface.
Samples X6, X7, Y6, Y7, Z were produced by forming a coating layer having the same structure as that of No. 4 (the present invention product) and Z1 and Z2 under the same conditions.
3 and Z4 were produced and evaluated under the same cutting conditions 13 and 14 of Example 11 under cutting conditions 13 'and 14' in which only the cutting depth was changed to 0.5 mm. The results are shown in Table 21.
The orientation of the coating layer and the amount of chlorine in the film were the same as those of the sample of Example 11. As a result, it can be seen that the product of the present invention has a better balance of wear resistance, peeling resistance, and in-film fracture resistance than the conventional product.

[0076]

[Table 21]

(Example 13) Silicon nitride ceramics in the shape of CNMG120408 was used as a base material, and X1, X4, Y1 and Y4 in Table 19 were formed on the surface thereof (the above products of the present invention).
And a coating layer having the same structure as Z1 and Z2 under the same conditions, to produce samples X8, X9, Y8, Y9, Z5 and Z6,
Evaluation was made under cutting conditions 15 and 16. The results are shown in Table 22. In addition, the orientation of the coating layer and the amount of chlorine in the film are determined in Example 1
It was the same as the sample of No. 1. As a result, it can be seen that the product of the present invention has a better balance of wear resistance, peeling resistance, and in-film fracture resistance than the conventional product.

Cutting condition 15 Work material: FC25 Cutting speed: 600 m / min Feed: 0.30 mm / rev Cutting depth: 1 mm Cutting time: 30 minutes Cutting oil: None Cutting condition 16 Work material: FC25 Cutting speed: 300 m / min Feed: 0.30 mm / rev Depth of cut: 1.5 mm Cutting time: 1 pass = 5 seconds repeated 500 times Cutting oil: None

[0079]

[Table 22]

(Example 14) Whisker-containing alumina-based ceramics in the shape of SNMN120408 was used as a base material, and X1, X4, Y1, and Y4 in Table 19 were formed on the surface thereof.
Samples X10, X11, Y10 and Y1 were produced by forming a coating layer having the same structure as (the above-mentioned product of the present invention) and Z1 and Z2 under the same conditions.
1, Z7 and Z8 were produced and evaluated under cutting conditions 17 and 18. The results are shown in Table 23. The orientation of the coating layer and the amount of chlorine in the film were the same as those of the sample of Example 11. As a result, in the product of the present invention, as compared with the conventional product, wear resistance,
It can be seen that the balance between peeling resistance and in-film fracture resistance is improved.

Cutting condition 17 Work material: FCD70 Cutting speed: 350 m / min Feed: 0.30 mm / rev Cutting depth: 1 mm Cutting time: 30 minutes Cutting oil: None Cutting condition 18 Work material: FCD70 Cutting speed: 250 m / min Feed: 0.30 mm / rev Depth of cut: 1.5 mm Cutting time: 1 pass = 5 seconds repeated 500 times Cutting oil: None

[0082]

[Table 23]

(Example 15) CNMG of ISO P30
120408 shape tungsten carbide based cemented carbide
Used as a material, TiN (0.5 μm) / Al on this surface
₂O₃(3.0 μm) / TiBCN (0.5 μm) / T
Structure composed of iCN (20 μm) / base material (TiN of upper layer)
And Al₂O₃Sample X that produced a coating layer of which the layer is the outer layer)
12 to X13, and TiN (0.5 μm) / Al₂O₃
(2.0 μm) / TiBCN (0.5 μm) / TiCN
(20 μm) / TiN (0.5 μm) / base material
Structure (TiN and Al of upper layer₂O₃Layer is the outer layer)
The formed samples Y12 to Y13 were produced. Where Y1
The formation of TiN in contact with the base materials of 2 to Y13 is at 750 ° C.
Titanium tetrachloride 1%, nitrogen (N₂) 45%, ammonia
(NH₃) 5%, hydrogen (H ₂) In the rest of the mixed gas flow
went. In addition, in X12 to X13 and Y12 to Y13
The formation of titanium carbonitride in the inner layer is 80 in numerical order.
At a temperature of 0 and 950 ° C., titanium tetrachloride 4%, N₂To
Fix to 26%, change acetonitrile to 0.4-1%
Let the rest be H₂Was carried out in a mixed gas stream. Coating
The layer thickness can be adjusted to the above value by changing the holding time.
It was adjusted. The average salt in TiCN and TiN of the inner layer
The elemental content of X12 and Y12 is 0.1 to 0.15%,
Average of TiCN and TiN for X13 and Y13
And the average in the inner layer was 0.05% or less. these
Table 24 shows the orientation in the film of the product of the present invention. Furthermore, the same
The formation condition of TiCN is methane (CH_Four) 10
%, Nitrogen (N₂) 5%, titanium tetrachloride 1%, remaining hydrogen
(H₂) Comparative sun made at 1000 ° C in a gas stream
Pull Z9 (same film structure as X6) and Z10 (same as Y6)
Table 24 also shows the orientation of the film having the film structure). these
Cutting conditions 19 and 20 using the sample
Table 25 shows the processed results. From this result, X of the present invention product
12-X13 and Y12-Y13 are higher than Z9 and Z10
The balance of abrasion resistance, peeling resistance, and in-film fracture resistance is large.
The effect of controlling the orientation is within the scope of the present invention.
The result is clear.

Cutting conditions 19 Work material: SCM415 (HB = 200) Cutting speed: 150 m / min Feed: 0.35 mm / rev Depth of cut: 1.5 mm Cutting time: 30 minutes Cutting oil: Water-soluble Cutting conditions 20 Work material : SCM415 (HB = 140) Cutting speed: 300m / min Feed: 0.35mm / rev Depth of cut: 1.5mm Cutting time: Repeated 1000 times with 1pass = 5 seconds Cutting oil: Water soluble

[0085]

[Table 24]

[0086]

[Table 25]

[0087]

EFFECTS OF THE INVENTION The coated cutting tool of the present invention has a higher abrasion resistance of the coating film itself than the conventional coated cutting tool, the adhesion between the coating film and the base material is strong, and peeling resistance during cutting is high. It has excellent properties. Further, in the conventional product, the thickness of the coating layer was about 10 to 15 μm, but it became possible to increase the thickness of the coating layer to about 100 μm. Further, according to the manufacturing method of the present invention, it is possible to easily manufacture the cutting tool having the above-mentioned excellent characteristics.

Claims (17)

[Claims] 1. A base material comprising a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics, and a coating layer comprising an inner layer and an outer layer, the inner layer being a base material. Titanium carbonitride monolayer in contact with or thickness 0.1-2 in contact with base material
a titanium carbide, nitride, carbonitride, boronitride or borocarbonitride on a double layer of titanium nitride having a thickness of μm and titanium carbonitride immediately above it or on the above single layer or double layer of titanium carbonitride It is composed of multiple layers coated with at least one selected, and the outer layer is composed of one or more single layers or multiple layers selected from aluminum oxide, zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride. The coated cutting tool according to claim 1, wherein the chlorine content in the inner layer is 0.05 atom% or less on average for the entire inner layer. 2. The chlorine content of titanium carbonitride in contact with the base material of the inner layer or the thickness of 0.1 to 2 μm in contact with the base material.
2. The coated cutting tool according to claim 1, wherein the average chlorine content in the titanium nitride of 1. and the titanium carbonitride immediately above is 0.05 atomic% or less. 3. A base material comprising a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics, and a coating layer comprising an inner layer and an outer layer, the inner layer being a base material. Titanium carbonitride monolayer in contact with or thickness 0.1-2 in contact with base material
a titanium carbide, nitride, carbonitride, boronitride or borocarbonitride on a double layer of titanium nitride having a thickness of μm and titanium carbonitride immediately above it or on the above single layer or double layer of titanium carbonitride It is composed of multiple layers coated with at least one selected, and the outer layer is composed of one or more single layers or multiple layers selected from aluminum oxide, zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride. X-ray diffraction angle 2θ = 2 in titanium carbonitride directly in contact with the base metal or titanium nitride having a thickness of 0.1 to 2 μm in contact with the base metal.
Of the surfaces where the diffraction peak appears between 0 ° and 140 °,
A total I (hkl) of diffraction peak intensities of a surface (hkl) having an angle between the (220) plane and 30 ° to 60 °;
Ratio of peak intensity I (220) of (220) plane to I (h)
The value of kl) / I (220) is 2.5 ≦ I (hkl) / I (220) ≦ 7.0 on average from 0 to 3 μm from the surface of the base material or the surface of titanium nitride,
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 2.5 ≦ I (hkl) / I (220) ≦ 15.0 on average. 4. An X-ray diffraction angle 2θ = 20 ° to 1 in titanium carbonitride in contact with the base material of the inner layer or titanium carbonitride immediately above titanium nitride in contact with the base material and having a thickness of 0.1 to 2 μm.
Of the planes where the diffraction peak appears between 40 °, (220)
The ratio I (hkl) / I of the total I (hkl) of the diffraction peak intensities of the plane (hkl) having an interplanar angle of 30 ° to 60 ° to the plane and the peak intensity I (220) of the (220) plane (2
The value of 20) is 0 from the surface of the base material or the surface of titanium nitride.
2.5 ≦ I (hkl) / I (220) ≦ 7.0 on average up to 3 μm,
And 0 to 20 μm from the base material surface or titanium nitride surface
The coated cutting tool according to claim 1 or 2, wherein an average of 2.5 ≦ I (hkl) / I (220) ≦ 15.0 is satisfied. 5. A base material comprising a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics, and a coating layer comprising an inner layer and an outer layer, the inner layer being a base material. Titanium carbonitride monolayer in contact with or thickness 0.1-2 in contact with base material
a titanium carbide, nitride, carbonitride, boronitride or borocarbonitride on a double layer of titanium nitride having a thickness of μm and titanium carbonitride immediately above it or on the above single layer or double layer of titanium carbonitride It is composed of multiple layers coated with at least one selected, and the outer layer is composed of one or more single layers or multiple layers selected from aluminum oxide, zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride. In the coated cutting tool, the titanium carbonitride in contact with the base material or the titanium carbonitride just above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material is subjected to X-ray diffraction (31
When the peak intensity of the 1) plane is I (311) and the peak intensity of the (220) plane is I (220), I (311) / I
The value of (220) is 0.5 ≦ I (311) / I (220) ≦ 1.5 on average from 0 to 3 μm from the base material surface or titanium nitride surface,
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 0.5 ≦ I (311) / I (220) ≦ 6.0 on average. 6. Titanium carbonitride in contact with the base material of the inner layer or titanium carbonitride immediately above the titanium nitride in contact with the base material and having a thickness of 0.1 to 2 μm, (311) in X-ray diffraction
The value of the ratio I (311) / I (220) between the peak intensity I (311) of the plane and the peak intensity I (220) of the (220) plane is 0 to 3 μm from the surface of the base material or the surface of titanium nitride.
Up to 0.5 ≦ I (311) / I (220) ≦ 1.5,
And 0 to 20 μm from the base material surface or titanium nitride surface
The coated cutting tool according to any one of claims 1 to 4, wherein the average is 0.5≤I (311) / I (220) ≤6.0. 7. A base material comprising a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics, and a coating layer comprising an inner layer and an outer layer, the inner layer being a base material. Titanium carbonitride monolayer in contact with or thickness 0.1-2 in contact with base material
a titanium carbide, a nitride, a carbonitride, a boronitride, or a borocarbonitride of titanium on a double layer of titanium nitride of μm and titanium carbonitride immediately above it It is composed of multiple layers coated with one or more selected, and the outer layer is composed of one or more single layers or multiple layers selected from aluminum oxide, zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride. In the coated cutting tool, the titanium carbonitride in contact with the base material or the titanium carbonitride just above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material is subjected to X-ray diffraction (11
When the peak intensity of the 1) plane is I (111) and the peak intensity of the (220) plane is I (220), I (111) / I
The value of (220) is 1.0 ≦ I (111) / I (220) ≦ 4.0 on the average from the surface of the base material or the surface of titanium nitride to 0 to 3 μm,
And 0 to 20 μm from the base material surface or titanium nitride surface
Up to 1.0 ≦ I (111) / I (220) ≦ 8.0 on average. 8. A titanium carbonitride in contact with the base material of the inner layer or a titanium carbonitride directly above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, wherein (111) in X-ray diffraction
The value of the ratio I (111) / I (220) between the peak intensity I (111) of the plane and the peak intensity I (220) of the (220) plane is 0 to 3 μm from the surface of the base material or the surface of titanium nitride.
Is 1.0 ≦ I (111) / I (220) ≦ 4.0 on average and 1.0 ≦ I (111) / I (220) on average from 0 to 20 μm from the base material surface or titanium nitride surface. 7. The coated cutting tool according to claim 1, wherein ≦ 8.0. 9. A base material comprising a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics, and a coating layer comprising an inner layer and an outer layer, the inner layer being a base material. Titanium carbonitride monolayer in contact with or thickness 0.1-2 in contact with base material
a titanium carbide, nitride, carbonitride, boronitride or borocarbonitride on a double layer of titanium nitride having a thickness of μm and titanium carbonitride immediately above it or on the above single layer or double layer of titanium carbonitride It is composed of multiple layers coated with at least one selected, and the outer layer is composed of one or more single layers or multiple layers selected from aluminum oxide, zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride. In the coated cutting tool, the titanium carbonitride in contact with the base material or the titanium carbonitride just above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material is subjected to X-ray diffraction (31
When the peak intensity of the 1) plane is I (311), the peak intensity of the (111) plane is I (111), and the peak intensity of the (220) plane is I (220), {I (111) + I (31
1)} / I (220) is 2.0 ≦ {I (111) + I (311)} / I (22 on average from 0 to 3 μm from the base material surface or titanium nitride surface.
0) ≦ 5.5, and 2.0 ≦ {I (111) + I (311)} / I (22 on average from 0 to 20 μm from the base material surface or titanium nitride surface.
0) ≤ 14.0, a coated cutting tool. 10. Titanium carbonitride in contact with the base material of the inner layer or titanium carbonitride immediately above titanium nitride in contact with the base material and having a thickness of 0.1 to 2 μm, (31
Peak intensity I of (1) plane I (311), peak intensity I of (111) plane I (111) and peak intensity I of (220) plane
Relational expression of (220) {I (111) + I (311)} /
The value of I (220) is 2.0 ≦ {I (111) + I (311)} / I (22 on average from 0 to 3 μm from the surface of the base material or the surface of titanium nitride.
0) ≦ 5.5, and 2.0 ≦ {I (111) + I (311)} / I (22 on average from 0 to 20 μm from the base material surface or titanium nitride surface.
The coated cutting tool according to any one of claims 1 to 8, wherein 0) ≤ 14.0. 11. The titanium carbonitride in contact with the base material of the inner layer or the titanium carbonitride immediately above the titanium nitride in contact with the base material having a thickness of 0.1 to 2 μm has a thickness of 1 to 20 μm. Item 11. The coated cutting tool according to any one of items 1 to 10. 12. The base material is a tungsten carbide based cemented carbide or titanium carbonitride based cermet, and the thickness of the η phase at the outermost surface of the interface between the coating layer and the base material at the cutting edge ridge is 1 μm.
It is m or less, The coated cutting tool in any one of Claim 1 thru | or 11 characterized by the above-mentioned. 13. The total thickness of the inner layer and the outer layer is 2-1.
The coated cutting tool according to claim 1, wherein the coated cutting tool has a thickness of 00 μm. 14. A base material comprising a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics, and a coating layer comprising an inner layer and an outer layer, the inner layer being a base material. Titanium carbonitride single layer in contact with or thickness in contact with base material 0.1
Carbide, nitride, carbonitride, boronitride of titanium on a double layer of 2 μm titanium nitride and titanium carbonitride immediately above it or on the above single or double layer titanium carbonitride,
It is composed of multiple layers coated with one or more selected from borocarbonitrides, and the outer layer is one or more single layers or multiple layers selected from aluminum oxide, zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride, and titanium nitride. In the method for producing a coated cutting tool composed of multiple layers, titanium carbonitride in contact with the base material or a thickness of 0.1 in contact with the base material.
As a method for coating titanium carbonitride directly on titanium nitride having a thickness of up to 2 μm, titanium tetrachloride is used as a titanium source, an organic CN compound is used as a carbon nitrogen source, and a chemical vapor deposition method is performed in an atmosphere having a nitrogen concentration of 26% or more. , A method for producing a coated cutting tool, comprising coating in a temperature range of 800 to 950 ° C. 15. A base material comprising a tungsten carbide based cemented carbide, a titanium carbonitride based cermet, a silicon nitride based ceramics or an aluminum oxide based ceramics, and a coating layer comprising an inner layer and an outer layer, the inner layer being a base material. Titanium carbonitride single layer in contact with or thickness in contact with base material 0.1
Carbide, nitride, carbonitride, boronitride of titanium on a double layer of 2 μm titanium nitride and titanium carbonitride immediately above it or on the above single layer or double layer titanium carbonitride,
It is composed of multiple layers coated with one or more selected from borocarbonitrides, and the outer layer is one or more single layers or multiple layers selected from aluminum oxide, zirconium oxide, hafnium oxide, titanium carbide, titanium carbonitride and titanium nitride. In the method for producing a coated cutting tool composed of multiple layers, titanium carbonitride in contact with the base material or a thickness of 0.1 in contact with the base material.
As a method for coating titanium carbonitride directly on titanium nitride having a thickness of ˜2 μm, a chemical vapor deposition method using titanium tetrachloride as a titanium source and an organic CN compound as a carbon monoxide source is used to obtain 950
A method for producing a coated cutting tool, which comprises coating in a temperature range of 1050C. 16. A method of coating titanium carbonitride in contact with the base material or titanium carbonitride directly above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, titanium tetrachloride as a titanium source, carbon monoxide source 14. An organic CN compound is used as the material, and the coating is performed in a temperature range of 800 to 950 ° C. by a chemical vapor deposition method performed in an atmosphere having a nitrogen concentration of 26% or more. Manufacturing method of coated cutting tool. 17. A method of coating titanium carbonitride in contact with the base material or titanium carbonitride directly above titanium nitride having a thickness of 0.1 to 2 μm in contact with the base material, titanium tetrachloride as a titanium source, carbon monoxide source The method for producing a coated cutting tool according to any one of claims 1 to 13, wherein the coating is performed in a temperature range of 950 to 1050 ° C by a chemical vapor deposition method using an organic CN compound as a material.