CN105986204A - Carbon-nanofiber-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 carbon-nanofiber-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 Mn, B and nanoscale Mo powder, the composite material having excellent mechanical properties is obtained, the utilization rate of elements is increased, besides, a polyvinylpyrrolidone anhydrous ethanol solution is used as a medium, carbon nanofibers are dispersed in the medium, then the mixture is mixed with Mg powder for grinding, the carbon nanofibers are 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, the prepared magnesium alloy material is light in mass, high in strength, good in toughness, wear-resistant, corrosion-resistant, compression-resistant and cracking-resistant, and the processability and use performance of the automobile parts prepared from the material are improved.

Description

The Mg-Al-Zn series magnesium alloy material that a kind of carbon nano-fiber for casting auto parts and components is modified And preparation method thereof

Technical field

The present invention relates to magnesium alloy materials preparing technical field, be specifically related to modified Mg-Al-Zn series magnesium alloy material of a kind of carbon nano-fiber 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 a kind of Mg-Al-Zn series magnesium alloy material of carbon nano-fiber 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 that a kind of carbon nano-fiber for casting auto parts and components is modified, it is characterised in that this magnesium alloy materials is made up of the raw material of following percentage by weight: Al powder 5-6 wt.%, Zn powder 3-4 wt.%, Mn powder 1-2wt.%, B powder 0.2-0.3 wt.%, nanometer Mo powder 0.1-0.2 wt.%, carbon nano-fiber 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 that described a kind of carbon nano-fiber for casting auto parts and components is modified is:

(1) first polyvinylpyrrolidone is put in appropriate dehydrated alcohol, it is configured to polyvinylpyrrolidone dehydrated alcohol, put into carbon nano-fiber subsequently, high-speed stirred dispersion makes carbon nano-fiber 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 700-750 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 high heat-resisting alloy of Mg-Al-Zn system, and blended Mn wherein, B and nano level Mo powder, obtain the composite of good mechanical performance, the utilization rate of element is improved, in addition, using polyvinylpyrrolidone ethanol solution as medium, carbon nano-fiber is dispersed therein, again by itself and Mg powder mixed grinding, carbon nano-fiber 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 materials light weight of preparation, intensity is big, toughness is good, wear-and corrosion-resistant, resistance to compression cracking 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 5.5 wt.%, Zn powder 3.5wt.%, Mn powder 2wt.%, B powder 0.2 wt.%, nanometer Mo powder 0.1wt.%, carbon nano-fiber 1.5 wt.%, polyvinylpyrrolidone 0.01wt.%, 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 carbon nano-fiber subsequently, high-speed stirred dispersion makes carbon nano-fiber be completely dispersed uniformly in the solution, puts into Mg powder subsequently, and mixed slurry puts into after continuing dispersed with stirring 25min grinding in ball grinder stirring 45min, finally gained slurry drying is processed, completely removing dehydrated alcohol, gained mixed powder is standby, and wherein dehydrated alcohol is 1.3:1 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 720 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: 350MPa, elongation percentage: 15.4%, hardness: 142HV, under the conditions of 200 DEG C, tensile strength reaches 326MPa, elongation percentage is 12.3%, and the more congener ordinary magnesium alloy of wearability improves 64.8%.

Claims (2)

1. the Mg-Al-Zn series magnesium alloy material being used for casting the carbon nano-fiber 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 5-6 wt.%, Zn powder 3-4 wt.%, Mn powder 1-2wt.%, B powder 0.2-0.3 wt.%, nanometer Mo powder 0.1-0.2 wt.%, carbon nano-fiber 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 that a kind of carbon nano-fiber for casting auto parts and components is modified, 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 carbon nano-fiber subsequently, high-speed stirred dispersion makes carbon nano-fiber 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 700-750 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.