CN105986156A - Nano-silicon-carbide-modified Mg-Al-Zn magnesium alloy material for casting automobile parts and preparation method of material - Google Patents

Abstract

The invention relates to the technical field of magnesium alloy preparation, in particular to a nano-silicon-carbide-modified Mg-Al-Zn magnesium alloy material for casting automobile parts and a preparation method of the material. The material is a high-heat-resistance Mg-Al-Zn alloy and is doped with Si, Bi and nanoscale Nb elements, the high-performance composite alloy material is obtained, the utilization rate of the elements is higher, besides, a polyvinylpyrrolidone anhydrous ethanol solution is used as a medium, nano silicon carbide is dispersed in the medium, then the mixture is mixed with Mg powder for grinding, nano silicon carbide is evenly coated with and dispersed in the Mg powder, mixing with other metal elements in the subsequent smelting process is more sufficient, the modification effect is better than that of a direct doping method, a prepared magnesium alloy is fine in structure, high in hardness, light in mass, corrosion-resistant, wear-resistant, heat-resistant and oxidation-resistant, and the processability and use performance of the automobile parts prepared from the material are improved.

Description

A kind of Mg-Al-Zn series magnesium alloy material of the nano silicon carbide Si modification for casting auto parts and components And preparation method thereof

Technical field

The present invention relates to magnesium alloy materials preparing technical field, be specifically related to Mg-Al-Zn series magnesium alloy material of a kind of nano silicon carbide Si modification for casting auto parts and components and preparation method thereof.

Background technology

It is relatively broad that magnesium alloy materials manufactures field application at auto parts and components, market demand the most progressively rises, magnesium alloy materials has that mass density is little, damping property good, specific strength and specific stiffness is high, fusing point is low, good casting property, more utilize the advantages such as automotive light weight technology, although magnesium alloy materials possesses these advantages, but at present magnesium alloy materials application in the car is the most extremely limited, cause the reason of this phenomenon mainly, not environmental corrosion resisting poor with the presence of: magnesium alloy high temperature creep；High-performance magnesium-alloy production cost is higher.

nullThe kind of magnesium alloy mainly has Mg-Al-Zn system high-ductility alloy at present、Mg-Al system heat-resisting alloy、Mg-Zn system heat-resisting alloy and Mg-Zn-RE、Mg-RE etc. are several，Wherein Mg-Al system heat-resisting alloy most species，Add different element proportionings and can obtain the Mg-Al series alloy of different performance characteristics，No doubt there is the advantage that it is exclusive in these alloy materials，There is also some defects，It is higher that existing problem is concentrated mainly on production cost、The aspects such as stock utilization is low，Still it is restricted in reality application，Therefore，Following research aspect is concentrated mainly on and replaces rare earth element with other elements of part，To reduce production cost and the invigoration effect of more efficient comprehensive each element，The harmful effect of suppression single-element，Improve the single mode of production，Obtain the alloy material that combination property is the most excellent.

Summary of the invention

In order to overcome the defect of prior art, the present invention provides Mg-Al-Zn series magnesium alloy material of a kind of nano silicon carbide Si modification for casting auto parts and components and preparation method thereof, and to achieve these goals, the technical solution used in the present invention is as follows:

The Mg-Al-Zn series magnesium alloy material of a kind of nano silicon carbide Si modification for casting auto parts and components, it is characterised in that this magnesium alloy materials is made up of the raw material of following percentage by weight: Al powder 5-8 wt.%, Zn powder 3-4 wt.%, Si powder 0.1-0.2 wt.%, Bi powder 1-2 wt.%, nanometer Nb powder 1-1.5wt.%, nanometer silicon carbide 1-2 wt.%, polyvinylpyrrolidone 0.01-0.02 wt.%, dehydrated alcohol are appropriate, impurity element≤0.01 wt.%, surplus are Mg powder.

The preparation method of the Mg-Al-Zn series magnesium alloy material of described a kind of nano silicon carbide Si modification for casting auto parts and components is:

(1) first polyvinylpyrrolidone is put in appropriate dehydrated alcohol, it is configured to polyvinylpyrrolidone dehydrated alcohol, put into nanometer silicon carbide subsequently, high-speed stirred dispersion makes nanometer silicon carbide be completely dispersed uniformly in the solution, put into Mg powder subsequently, after continuing dispersed with stirring 20-30min, mixed slurry is put into grinding in ball grinder stirring 40-50min, finally gained slurry drying is processed, completely remove dehydrated alcohol, gained mixed powder is standby, and wherein dehydrated alcohol is 1-1.5:1 with the volume ratio of Mg powder；

(2) mixed powder that step (1) prepares is mixed with other leftover materials; put into after being thoroughly mixed uniformly in resistance furnace; under protective gas atmosphere, it is heated to 700-720 DEG C while stirring carries out melting process; after material is completely melted, 20-30min is placed in insulation; finally by compressing for gained melt cast, to obtain final product.

Beneficial effect: the present invention is prepared for the present invention and is prepared for the high heat-resisting alloy of Mg-Al-Zn system, and blended Si wherein, the Nb element of Bi and nanometer scale, obtain high performance composite alloy material, the utilization rate of element is higher, in addition, using polyvinylpyrrolidone ethanol solution as medium, nanometer silicon carbide is dispersed therein, again by itself and Mg powder mixed grinding, nanometer silicon carbide is uniformly wrapped up be scattered in Mg powder, in follow-up fusion process the most abundant with what other metallic element mixed, than the method modified effect directly blended more preferably, the Magnesium Alloy of preparation is fine and closely woven, hardness is high, light weight, corrosion-proof wear, heat-resisting oxidation-resistance, auto parts and components processing characteristics and the serviceability prepared with this material are all improved.

Detailed description of the invention

Embodiment

The magnesium alloy materials of the present embodiment is made up of the raw material of following weight portion: Al powder 7wt.%, Zn powder 3wt.%, Si powder 0.1wt.%, Bi powder 1.5wt.%, nanometer Nb powder 1wt.%, nanometer silicon carbide 1.5 wt.%, polyvinylpyrrolidone 0.01 wt.%, dehydrated alcohol are appropriate, impurity element≤0.01 wt.%, surplus are Mg powder.

Its preparation method is:

(1) first polyvinylpyrrolidone is put in appropriate dehydrated alcohol, it is configured to polyvinylpyrrolidone dehydrated alcohol, put into nanometer silicon carbide subsequently, high-speed stirred dispersion makes nanometer silicon carbide be completely dispersed uniformly in the solution, puts into Mg powder subsequently, and mixed slurry puts into after continuing dispersed with stirring 20min grinding in ball grinder stirring 40min, finally gained slurry drying is processed, completely removing dehydrated alcohol, gained mixed powder is standby, and wherein dehydrated alcohol is 1:1 with the volume ratio of Mg powder；

(2) mixed powder that step (1) prepares is mixed with other leftover materials; put into after being thoroughly mixed uniformly in resistance furnace; under protective gas atmosphere, it is heated to 710 DEG C while stirring carries out melting process; after material is completely melted, 25min is placed in insulation; finally by compressing for gained melt cast, to obtain final product.

The magnesium alloy that the present embodiment prepares is materialsed and is carried out the performance test results and be: the tensile strength under room temperature: 314MPa, elongation percentage: 10.6%, hardness: 133HV, under the conditions of 200 DEG C, tensile strength reaches 292MPa, elongation percentage is 9.2%, and the more congener ordinary magnesium alloy of wearability improves 58.2%.

Claims (2)

1. the Mg-Al-Zn series magnesium alloy material being used for casting the nano silicon carbide Si modification of auto parts and components, it is characterized in that, this magnesium alloy materials is made up of the raw material of following percentage by weight: Al powder 5-8 wt.%, Zn powder 3-4 wt.%, Si powder 0.1-0.2 wt.%, Bi powder 1-2 wt.%, nanometer Nb powder 1-1.5wt.%, nanometer silicon carbide 1-2 wt.%, polyvinylpyrrolidone 0.01-0.02 wt.%, dehydrated alcohol are appropriate, impurity element≤0.01 wt.%, surplus are Mg powder.

The preparation method of the Mg-Al-Zn series magnesium alloy material of a kind of nano silicon carbide Si modification for casting auto parts and components, it is characterised in that described preparation method is:

(1) first polyvinylpyrrolidone is put in appropriate dehydrated alcohol, it is configured to polyvinylpyrrolidone dehydrated alcohol, put into nanometer silicon carbide subsequently, high-speed stirred dispersion makes nanometer silicon carbide be completely dispersed uniformly in the solution, put into Mg powder subsequently, after continuing dispersed with stirring 20-30min, mixed slurry is put into grinding in ball grinder stirring 40-50min, finally gained slurry drying is processed, completely remove dehydrated alcohol, gained mixed powder is standby, and wherein dehydrated alcohol is 1-1.5:1 with the volume ratio of Mg powder；

(2) mixed powder that step (1) prepares is mixed with other leftover materials; put into after being thoroughly mixed uniformly in resistance furnace; under protective gas atmosphere, it is heated to 700-720 DEG C while stirring carries out melting process; after material is completely melted, 20-30min is placed in insulation; finally by compressing for gained melt cast, to obtain final product.