JPH0534308B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inorganic fiber-reinforced ceramic composite (FRC) and a method for producing the same.

(Prior Art) Heat-resistant ceramics are used under harsh conditions such as extremely high temperatures, extremely high pressures, and corrosive environments. Generally, heat-resistant ceramics have the disadvantage that they are weak against mechanical shock and that their mechanical strength and corrosion resistance decrease at high temperatures. To compensate for these drawbacks, composites have been developed in which continuous fibers made of alumina, carbon, etc., short fibers made of silicon carbide, or whiskers are combined with ceramic. For example, JP-A-52-81309 describes a method for producing a heat-resistant ceramic composite reinforced with silicon carbide fibers obtained from organosilicon polymer compounds.

(Problems to be Solved by the Invention) However, with this method, it is difficult to uniformly disperse the reinforcing fibers in the ceramic matrix.

Furthermore, FRC reinforced only with inorganic long fibers has a large strength anisotropy; the strength in the longitudinal direction of the fibers is high, but the strength in the direction perpendicular to it is extremely low. Although FRC using only short fibers is isotropic, its strength is generally low. In order to produce a composite that has both of these properties, the present inventors first immersed a continuous fiber bundle in a solution in which short fibers, whiskers, or powder were suspended. We proposed a method of attaching short fibers, whiskers, or powder to the material. Although this method is excellent in producing FRC, further detailed study revealed that it may not always be sufficient depending on the form of adhesion of short fibers, whiskers, or powder.

The present invention is intended to solve the problems in the prior art described above, and its purpose is to uniformly disperse continuous fibers in a composite material and control the fiber volume fraction when used in FRC. I can,
In addition, by combining continuous fibers with different properties, it is possible to reduce stress concentration between the continuous fibers and the matrix, prevent crack propagation during fracture, and improve the mechanical properties of the composite material. An object of the present invention is to provide an inorganic fiber-reinforced ceramic composite using a fibrous material and a method for producing the same.

(Means for Solving the Problems) That is, the inorganic fiber-reinforced ceramic composite of the present invention comprises a continuous fiber bundle or A woven fabric made from the continuous fiber bundle, fine particles made of at least one type of heat-resistant material such as ceramic, carbon, metal, etc. existing in the vicinity of the continuous fiber, and uniformly distributed between the fibers of the continuous fiber. It is characterized by comprising short fibers and/or whiskers made of at least one kind selected from heat-resistant substances such as ceramic, carbon, and metal dispersed therein, and a ceramic matrix.

Preferred embodiments of the composite of the present invention include, for example, the following.

(a) A composite in which the average particle diameter of fine particles is 1/30 or less of the average length of short fibers and/or whiskers.

(a) A composite in which the continuous fiber ceramic is at least one selected from carbide, nitride, oxide, and boride ceramics.

(c) The composite of (a) above, wherein the carbide ceramic is silicon carbide, the nitride ceramic is silicon nitride, and the oxide ceramic is alumina.

(D) Ceramic, which is a continuous fiber, is (i) an amorphous material consisting essentially of silicon, M, carbon and oxygen, or (ii) a solid solution of β-SiC, MC, or β-SiC and MC. and/or MC _1-X particle size 500Å
Each of the following crystalline ultrafine particles and amorphous
An aggregate consisting of SiO ₂ and MO ₂ , or (iii) a mixture of the amorphous substance in () above and an aggregate consisting of crystalline ultrafine particles and amorphous in () above, (However, in the above formula, M represents Ti or Zr,
X is a number greater than 0 and less than 1).

(e) A composite in which the volume ratio of fine particles, short fibers and/or whiskers to continuous fibers is 0.5 to 500%.

(f) The blending ratio of continuous fibers to the composite is 10 to 10.
The complex is 70% by volume.

(g) Ceramic, which is the matrix of the composite, is made of silicon carbide, titanium carbide, zirconium carbide,
vanadium carbide, niobium carbide, tantalum carbide,
Carbide ceramics such as boron carbide, chromium carbide, tungsten carbide, molybdenum carbide, and graphite; Nitride ceramics such as silicon nitride, titanium nitride, zirconium nitride, vanadium nitride, niobium nitride, tantalum nitride, boron nitride, aluminum nitride, and hafnium nitride. ; oxide ceramics such as alumina, silica, magnesia, mullite, cordierite; composites which are glass-ceramics such as borosilicate glasses, high silica-containing glasses, aluminosilicate glasses, etc.;

Further, the method for producing an inorganic fiber reinforced ceramic composite of the present invention includes a continuous fiber bundle made of continuous fibers containing at least one selected from the group consisting of ceramic, carbon, and metal, or a woven fabric made of the continuous fiber bundle. A cloth is immersed in a treatment liquid in which fine particles made of at least one type of heat-resistant material selected from ceramics, carbon, metals, etc., and short fibers and/or whiskers are suspended, and each continuous fiber is
The fine particles and the short fibers and/or
Alternatively, it is characterized in that a fibrous body produced by attaching whiskers is embedded in ceramic powder and fired.

Preferred embodiments of the method for producing a composite of the present invention include, for example, the following.

(h) A manufacturing method in which each component is one of the above (a) to (g).

(k) A manufacturing method in which many fine particles are attached near the surface of continuous fibers, and many short fibers and/or whiskers are attached to the outside thereof.

(j) A manufacturing method that applies ultrasonic vibration to the processing liquid.

(S) A manufacturing method that uses one processing tank containing processing liquid.

(c) A manufacturing method that uses two or more processing tanks containing processing liquid.

(S) A continuous fiber bundle or woven fabric is immersed in a treatment liquid in which fine particles are suspended, and then immersed in a treatment liquid in which short fibers and/or whiskers are suspended, so that many fine particles are placed near the surface of the continuous fibers. The manufacturing method of (C) above, in which a large amount of short fibers and/or whiskers are attached to the outside thereof.

Continuous fibers include ceramics such as silicon carbide,
Inorganic fibers made of fired products of silicon nitride, boron nitride, aluminum nitride, alumina, silica, polymetallocarbosilane, or heat-resistant nonmetallic elements such as carbon, boron, heat-resistant metals or alloys such as steel, stainless steel, tungsten, etc. can be used alone or in combination. Properties such as fiber thickness and cross-sectional shape are selected depending on the application.

As the fine particles, particles manufactured using the same material as that used for the continuous inorganic fiber can be used. One type of these may be used, or
Two or more types may be combined.

The short fibers and whiskers can be manufactured using the same material as that used for the continuous inorganic fibers or fine particles.

Moreover, any one type may be used, or two or more types may be used in combination.

The length, thickness, and cross-sectional shape of short fibers and whiskers should be selected taking into consideration the properties such as the average particle diameter of the fine particles, the combination with continuous fibers, and the required characteristics. 1/3000 of
Those with an average diameter of ~1/5 and an aspect ratio of 50-1000;
It is desirable to have an average diameter of 5,000 to 1/2.

Fine particles that are mostly attached to the inside of the continuous fibers, or short fibers that are mostly attached to the outside of the continuous fibers, and/or
Although the amount of whiskers varies depending on the properties of the two, the properties of the manufactured fibrous body, and the purpose of the FRC reinforced with it, the volume ratio of the total of short fibers, whiskers, and fine particles to continuous fibers is 0.1% or more.
It is preferable to set it to about 500%. Further, the ratio of fine particles to short fibers and/or whiskers is preferably in the range of 0.1:5 to 40:1 by weight.

Ceramic matrices in the present invention include those described in embodiment (g) above. These may be used alone or in combination.

The method for manufacturing the fibers used in the inorganic fiber-reinforced ceramic composite of the present invention is a suspension dipping method, which is preferred from the viewpoints of simplicity and wide applicability.
As an example of this suspension dipping method, a continuous fiber bundle made of continuous fibers wound around a bobbin or the like or a woven fabric made of this continuous fiber bundle is unwound to suspend fine particles, short fibers, and/or whiskers at the same time. One method is to immerse it in a cloudy liquid and wind it up on a bobbin again. The fiber bundle or woven fabric thus obtained is in a state in which fine particles, short fibers and/or whiskers are attached to the surface of each continuous fiber. In this case, the number of processing tanks containing the processing liquid may be one, but for various modification methods, two or more processing tanks containing processing liquids of different compositions may be used.

In addition, the processing liquid may be one in which fine particles and short fibers and/or whiskers are suspended at the same time, or a processing liquid in which fine particles are suspended and a treatment liquid in which short fibers and/or whiskers are suspended. may be used by placing them in two types of treatment tanks. In the latter case, the order in which the continuous fiber bundle or woven fabric is immersed may be in the treatment liquid in which fine particles are suspended or in the treatment liquid in which short fibers and/or whiskers are suspended.

Here, a continuous fiber bundle or woven fabric in which many fine particles are attached near the surface of the continuous fibers and many short fibers and/or whiskers are attached to the outside thereof can be produced as follows.

That is, after a continuous fiber bundle or woven fabric is immersed in a treatment liquid in which fine particles are suspended, short fibers and/or
Or immerse the whiskers in a treatment solution in which they are suspended. In this case, first the fine particles penetrate into the continuous fiber bundle,
It adheres to the surface of each fiber. This widens the fiber gaps and facilitates subsequent penetration of short fibers and/or whiskers into the continuous fiber bundle.

Alternatively, a continuous fiber bundle or woven fabric is immersed in a treatment liquid in which fine particles having an average particle diameter of 1/30 or less of the average length of short fibers and/or whiskers, and short fibers and/or whiskers are simultaneously suspended. In this case, the fine particles mainly first enter the fiber gaps, adhere to the surfaces of the fibers, and spread the fibers apart, thereby facilitating the penetration of the short fibers and/or whiskers into the fiber gaps. Furthermore, when vibration is applied using ultrasonic waves, each fiber can be uniformly attached to the fibers inside the fiber bundle. Ultrasonic waves may be applied by an ultrasonic adder installed outside the container containing the processing liquid, or by appropriately placing an appropriate number of ultrasonic transducers, such as ceramic transducers, in the processing liquid. You can give it to me. The ultrasonic irradiation pattern may be continuous or pulsed. The intensity, vibration frequency, and irradiation time are selected depending on the type of continuous fibers, short fibers, whiskers, or fine particles to be attached to the continuous fibers, the density of the deposits in the liquid, and the processing conditions such as the immersion time of the continuous fibers. For example, the frequency is
Approximately 10KHz to 2000KHz is easy to use.

The liquid for suspending the substance to be adhered may be water, but if a sizing agent is applied to the surface of the continuous fibers, a surfactant or a solvent for the sizing agent may be used. Organic solvents such as ethanol, methanol, acetone, especially ethanol,
Because it has higher volatility than water, it dries quickly and has the advantage of improving productivity. Alternatively, a mixture of the organic solvent and water may be used. The concentration of deposits in the treatment solution is not particularly limited in both cases where a plurality of processing solutions containing one type of deposit are used and when a single processing solution containing two or more types of deposits is used. If it is too small, uniform adhesion will not be observed on the continuous fibers and the effect will be lost, and if it is too large, the amount of adhesion will be larger than necessary.For example, silicon carbide whiskers with an average diameter of 0.3 μm and average particle size
6000 fibers/using 0.3μm silicon carbide particles
When treating a continuous fiber bundle of yarn, the concentration of these deposits is preferably about 0.5 g/~80 g/.

The immersion time can be adjusted by a conventional method such as using a movable roll. Furthermore, if necessary, the treated continuous fiber bundle is dried using a drying oven, an infrared dryer, a hot air dryer, etc. before being wound onto a bobbin. Furthermore, in order to prevent precipitation of short fibers and fine particles during the treatment, stirring means such as a stirrer may be used, or gas may be blown.

As for the continuous fibers used in the composite of the present invention and the fine particles, short fibers, and whiskers to be attached to the surface thereof, commercially available products can be used as they are.

In the present invention, the binder added as necessary during composite production includes a binder for sintering the ceramic matrix to a high density, and a binder for increasing the adhesion between the ceramic powder matrix and the inorganic fibers. There is a binding agent. The former includes binders used when sintering carbide, nitride, and oxide glass ceramics, respectively. For example, binders for silicon carbide include boron, carbon, and boron carbide, and binders for silicon nitride include alumina,
These include magnesia, ittria, and aluminum nitride. The latter include organic silicon polymers such as diphenylsiloxane, dimethylsiloxane, polyborodiphenylsiloxane, polyborodimethylsiloxane, polycarbosilane, polydimethylsilazane, polytitanocarbosilane, polyzirconocarbosilane, and diphenylsiloxane. Examples include organosilicon compounds such as enylsilandyl and hexamethyldisilazane.

The amount of these binders used is usually 0.5-20% by weight
It is.

The inorganic fiber-reinforced ceramic composite of the present invention can be manufactured by a method known per se as shown below in integrating the fiber body and the matrix.

There are various methods for obtaining an aggregate of a ceramic powder matrix and reinforcing fibers, and in particular, a method of embedding fibers in a ceramic powder matrix or a mixture of ceramic and a binder, and a method of embedding fibers in a ceramic powder matrix or a mixture of ceramic powder and a ceramic powder matrix. Alternatively, the aggregate can be formed relatively easily by a method in which the above-mentioned mixtures are arranged alternately, or by a method in which reinforcing fibers are placed in advance and the gaps are filled with the ceramic powder matrix or the above-mentioned mixture. Obtainable.
Next, the method for sintering these aggregates is as follows.
A method in which the aggregate is pressure-formed at a pressure of 50 to 5000 kg/cm ² using a rubber press, a mold press, etc., and then sintered in a heating furnace at a temperature range of 800 to 2400°C;
800~ while pressurized with a pressure of 50~5000Kg/ ^cm2
There are methods such as hot press sintering in a temperature range of 2400°C.

The above sintering can be performed in a vacuum or in an atmosphere consisting of an inert gas selected from nitrogen, argon, carbon monoxide, hydrogen, and the like.

The inorganic fiber-reinforced ceramic composite thus obtained can be made into a sintered body with even higher density by subjecting it to the following series of treatments at least once. That is, the sintered body is immersed under reduced pressure in a melt of an organosilicon compound or an organosilicon polymer, or if necessary, in a solution in which the compound or the polymer is dissolved in an organic solvent, and the melt or the solution is dissolved. A higher-density sintered body can be obtained by a series of treatments in which the grain boundaries and pores of the sintered body are impregnated and the impregnated sintered body is heated.
The heat treatment is performed at a temperature in the range of 800 to 2500° C. in vacuum or in an atmosphere consisting of an inert gas selected from nitrogen, argon, carbon monoxide, hydrogen, etc.

(Example) The present invention will be explained in further detail in the following example. Note that the present invention is not limited to the following examples.

100 g of silicon carbide whiskers (average diameter approximately 0.2 μm, average length approximately 100 μm) and silicon carbide particles (average particle size
After putting 250 g of ethyl alcohol (0.28 μm) into a processing tank containing 5000 c.c. of ethyl alcohol, ultrasonic vibration was applied using an ultrasonic adder to suspend the solution, thereby preparing a processing solution. A fiber bundle of silicon carbide fibers (500 threads) is unwound from the bobbin, the immersion time is adjusted to 15 seconds using a movable roller, and the immersion time is adjusted to 15 seconds, and the process is immersed in the processing solution. At the same time, ultrasonic waves are applied to the processing solution. The mixture was further stirred by blowing air into the mixture, then pressed with a pressure roller, wound up again on a bobbin, and dried at room temperature in the atmosphere. The fibers, which were black before treatment, turned grayish-green after treatment, and as a result of electron microscopic observation, it was observed that fine particles were attached to the surface of the continuous fibers, and whiskers were also attached to the outside of the fibers. In addition, as a result of weighing after treatment,
It was found that continuous fibers with 10% volume ratio of fine particles and whiskers attached were formed.

A sheet-like material in which the treated fiber bundles are uniaxially aligned, 2% by weight of alumina, 3% by weight of Ittria.
and α-silicon nitride powder (average particle size: 0.5μ) mixed with 3% by weight of aluminum nitride were alternately laminated so that the fibers of the fiber bundle were orthogonal to each other between different layers. The laminate was held at 1750°C and 300Kg/cm ² for 30 minutes using a hot press device.
An inorganic fiber reinforced silicon nitride composite sintered body was obtained.

The fiber content of this composite sintered body was 10% by weight. When the cross section of the composite was examined using a scanning electron microscope, it was found that the reinforcing fibers were dispersed in the silicon nitride matrix without touching each other. The bending strength of the composite at room temperature is 128
Kg/ ^mm2 , and the bending strength at 1300℃ is 68Kg/mm2.
It was warm in ^mm2 .

Note that the room temperature flexural strength of the composite obtained in the same manner as above except that silicon carbide whiskers and silicon carbide particles were not attached was 97 Kg/mm ² .

When a cross section of the FRC of the present invention was examined using an electron microscope, it was found that the continuous fibers of FRC are uniformly dispersed in the matrix ceramic because the distance between the fibers is maintained at an appropriate distance by the attachment of fine particles and whiskers on the outside.
The contact between fibers was reduced compared to when they were not attached.

Continuous fibers reinforced by adding only fine particles
In the case of FRC, the fiber spacing increases, but the reinforcing effect in the fiber vertical direction is small. In addition, FRC is reinforced by adding only whiskers or short fibers to continuous fibers.
In the case of , the fiber spacing is difficult to widen, and the reinforcing effect is small in both the fiber axial direction and the fiber perpendicular direction.

(Effects of the Invention) As described above, the inorganic fiber-reinforced ceramic composite of the present invention is a continuous fiber bundle in which fine particles, short fibers, and/or whiskers are attached to each surface of the continuous fibers, or a woven fabric made of the continuous fiber bundles. Because the matrix ceramic is reinforced with fabric, each continuous fiber can be uniformly distributed in the composite, making it possible to control the volume fraction of the fibers over a very wide range. In addition, the contact between continuous fibers is reduced, and the short fibers and/or
Alternatively, the whiskers prevent the propagation of cracks at the time of fracture, which strengthens the fiber not only in the axial direction but also in the direction perpendicular to the fiber axis, and the composition of the composite becomes uniform, improving mechanical properties such as strength. Ta.

In addition, in conventional fiber-reinforced ceramic composite materials, when the fiber content is low, the fibers tend to be unevenly distributed, making it difficult to obtain theoretical strength according to the composite law, but in the composite of the present invention, Even when the fiber content is low, the continuous fibers are dispersed very uniformly in the ceramic matrix, and the strength according to the composite law can be obtained, increasing the degree of freedom in design.

Further, the composite of the present invention can be made of various combinations of continuous inorganic fibers, fine particles of heat-resistant material, short fibers and/or whiskers, and ceramics serving as the matrix, and can satisfy a wide range of required properties.

Further, the above-mentioned composite can be easily obtained by the production method of the present invention.

Claims (1)

[Scope of Claims] 1. A continuous fiber bundle made of continuous fibers containing at least one member selected from the group consisting of ceramic, carbon, and metal, or a woven fabric made from the continuous fiber bundle, and the continuous fibers. fine particles consisting of at least one kind of heat-resistant substances such as ceramics, carbon, metals, etc. existing in the vicinity of the continuous fibers; An inorganic fiber-reinforced ceramic composite comprising short fibers and/or whiskers made of at least one selected type, and a ceramic matrix. 2. The inorganic fiber-reinforced ceramic composite according to claim 1, wherein the average particle diameter of the fine particles is 1/30 or less of the average length of the short fibers and/or whiskers. 3. The inorganic fiber-reinforced ceramic composite according to claim 1, wherein the continuous fiber ceramic is at least one selected from carbide, nitride, oxide, and boride ceramics. 4. The inorganic fiber reinforced ceramic composite according to claim 3, wherein the carbide ceramic is silicon carbide, the nitride ceramic is silicon nitride, and the oxide ceramic is alumina. 5 Ceramic, which is a continuous fiber, is (i) an amorphous material consisting essentially of silicon, M, carbon, and oxygen, or (ii) a solid solution of β-SiC, MC, β-SiC and MC, and/or Or each crystalline ultrafine particle of MC _1-X with a particle size of 500 Å or less and amorphous SiO ₂
or ( _iii ) a mixture of the amorphous substance in () above and the aggregate consisting of crystalline ultrafine particles and amorphous in () above (however, M in the above formula is Ti or indicates Zr,
The inorganic fiber-reinforced ceramic composite according to claim 1 or 2, wherein X is a number greater than 0 and less than 1. 6. The inorganic fiber reinforced ceramic composite according to claim 1, wherein the volume ratio of fine particles, short fibers and/or whiskers to continuous fibers is 0.5 to 500%. 7 The blending ratio of continuous fibers to the composite is 10~
The inorganic fiber reinforced ceramic composite according to claim 1, characterized in that the content is 70% by volume. 8 Ceramic which is the matrix of the composite is carbide ceramic such as silicon carbide, titanium carbide, zirconium carbide, vanadium carbide, niobium carbide, tantalum carbide, boron carbide, chromium carbide, tungsten carbide, molybdenum carbide, graphite; silicon nitride, nitride Nitride ceramics such as titanium, zirconium nitride, vanadium nitride, niobium nitride, tantalum nitride, boron nitride, aluminum nitride, hafnium nitride; alumina, silica, magnesia,
Oxide ceramics such as mullite and cordierite;
The inorganic fiber-reinforced ceramic composite according to claim 1, which is a glass ceramic such as borosilicate glass, high silica glass, or aluminosilicate glass. 9. Continuous fiber bundles made of continuous fibers containing at least one member selected from the group consisting of ceramics, carbon, and metals, or woven fabrics made of the continuous fiber bundles, are selected from heat-resistant materials such as ceramics, carbon, and metals. The fine particles, the short fibers and/or the whiskers are immersed in a treatment solution in which at least one of the continuous fibers is suspended, and the fine particles, the short fibers and/or the whiskers are coated on the surface of each of the continuous fibers. 1. A method for producing an inorganic fiber-reinforced ceramic composite, which comprises embedding a fibrous body produced by adhesion in ceramic powder and firing it. 10. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9, wherein the average particle diameter of the fine particles is 1/30 or less of the average length of short fibers and/or whiskers. 11. Production of an inorganic fiber-reinforced ceramic composite according to claim 9, wherein the ceramic that is the continuous fiber is at least one selected from carbide, nitride, oxide, and boride ceramics. Method. 12. Production of an inorganic fiber reinforced plastic composite according to claim 11, wherein the carbide ceramic is silicon carbide, the nitride ceramic is silicon nitride, and the oxide ceramic is alumina. Method. 13 Ceramic, which is a continuous fiber, is (i) an amorphous material consisting essentially of silicon, M, carbon, and oxygen, or (ii) a solid solution of β-SiC, MC, β-SiC and MC, and/or Or each crystalline ultrafine particle of MC _1-X with a particle size of 500 Å or less and amorphous SiO ₂
or ( _iii ) a mixture of the amorphous substance in () above and the aggregate consisting of crystalline ultrafine particles and amorphous in () above (however, M in the above formula is Ti or indicates Zr,
11. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9 or 10, wherein X is a number greater than 0 and less than 1. 14. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9, wherein the volume ratio of fine particles, short fibers and/or whiskers to continuous fibers is 0.5 to 500%. 15 The blending ratio of continuous fibers is 10 to the composite.
10. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9, wherein the content is 70% by volume. 16 The ceramic matrix of the composite is made of silicon carbide, titanium carbide, zirconium carbide,
Carbide ceramics such as vanadium carbide, niobium carbide, tantalum carbide, boron carbide, chromium carbide, tungsten carbide, molybdenum carbide, graphite;
Nitride ceramics such as silicon nitride, titanium nitride, zirconium nitride, vanadium nitride, niobium nitride, tantalum nitride, boron nitride, aluminum nitride, hafnium nitride; alumina, silica, magnesia,
Oxide ceramics such as mullite and cordierite;
10. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9, wherein the ceramic composite is a glass ceramic such as borosilicate glass, high silica glass, or aluminosilicate glass. 17. The inorganic fiber-reinforced ceramic composite according to claim 9, characterized in that many fine particles are attached to the vicinity of the surface of continuous fibers, and many short fibers and/or whiskers are attached to the outside thereof. manufacturing method. 18. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9, which comprises applying ultrasonic vibration to the treatment liquid. 19. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9, characterized in that one treatment tank containing a treatment liquid is used. 20. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 9, characterized in that two or more treatment tanks containing treatment liquid are used. 21 A continuous fiber bundle or woven fabric is immersed in a treatment liquid in which fine particles are suspended, and then immersed in a treatment liquid in which short fibers and/or whiskers are suspended, so that many fine particles are attached near the surface of the continuous fibers. 21. The method for producing an inorganic fiber-reinforced ceramic composite according to claim 20, characterized in that many short fibers and/or whiskers are attached to the outside of the composite.