CN105543600A - Nano zirconium carbide modified Mg-Al-Zn series magnesium alloy material for casting automobile parts and preparation method of nano zirconium carbide modified Mg-Al-Zn series magnesium alloy material - Google Patents

Abstract

The invention relates to the technical field of preparing magnesium alloy and in particular to a nano zirconium carbide modified Mg-Al-Zn series magnesium alloy material for casting automobile parts and a preparation method of the nano zirconium carbide modified Mg-Al-Zn series magnesium alloy material. The nano zirconium carbide modified Mg-Al-Zn series magnesium alloy material belongs to Mg-Al-Zn series high heat resisting alloy, as elements including Mn, Ca and nanoscale Ta are blended into the material, a high-performance alloy material is obtained, and the utilization rate of the elements are increased; and in addition, with a polyvinyl pyrrolidone ethanol solution as a medium, nano zirconium carbide is dispersed in the polyvinyl pyrrolidone ethanol solution, then a mixture and Mg powder are mixed together and ground to ensure the nano zirconium carbide to be fully wrapped by and dispersed in the Mg powder, and the mixture is also more fully mixed with other metal elements in the subsequent smelting process, so that the modification effect is better compared with that of a direct blending manner, the prepared magnesium alloy is high in both rigidity and toughness and very good in abrasion and corrosion resistances, and the processability and the using performance of the automobile parts prepared by the nano zirconium carbide modified Mg-Al-Zn series magnesium alloy material are both improved.

Description

Mg-Al-Zn series magnesium alloy material of a kind of nano silicon carbide modified zirconia for casting of automobile component and preparation method thereof

Technical field

The present invention relates to magnesium alloy materials preparing technical field, Mg-Al-Zn series magnesium alloy material being specifically related to a kind of nano silicon carbide modified zirconia for casting of automobile component and preparation method thereof.

Background technology

It is comparatively extensive that magnesium alloy materials manufactures field application at automobile component, market demand also progressively rises, magnesium alloy materials has that mass density is little, damping property good, specific tenacity and specific rigidity 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 magnesium alloy materials application in the car is at present also very limited, causes the reason of this phenomenon to mainly contain: magnesium alloy exists high temperature creep difference, not environmental corrosion resisting; High-performance magnesium-alloy production cost is higher.

The kind of current magnesium alloy mainly contains Mg-Al-Zn system high-ductility alloy, Mg-Al system refractory alloy, Mg-Zn system refractory alloy and Mg-Zn-RE, Mg-RE etc. are several, wherein Mg-Al system refractory alloy most species, add the Mg-Al series alloy that different element proportionings can obtain different performance characteristics, no doubt there is its exclusive advantage in these alloy materials, also there are some defects, it is higher that existing problem mainly concentrates on production cost, the aspects such as material use efficiency is low, still be restricted in practical application, therefore, following research aspect mainly concentrates on and replaces rare earth element with other elements of part, to reduce the strengthening effect of production cost and more efficient comprehensive each element, suppress the detrimentally affect of single-element, improve the single mode of production, obtain the alloy material that over-all properties is more excellent.

Summary of the invention

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

A kind of Mg-Al-Zn series magnesium alloy material of the nano silicon carbide modified zirconia for casting of automobile component, it is characterized in that, this magnesium alloy materials is made up of the raw material of following weight percent: Al powder 5-8wt.%, Zn powder 3-4wt.%, Mn powder 1-2wt.%, Ca powder 0.2-0.3wt.%, nanometer Ta powder 1-2wt.%, nano-zirconium carbide 1-2wt.%, polyvinylpyrrolidone 0.01-0.02wt.%, dehydrated alcohol are appropriate, impurity element≤0.01wt.%, surplus are Mg powder.

The preparation method of the Mg-Al-Zn series magnesium alloy material of described a kind of nano silicon carbide modified zirconia for casting of automobile component is:

(1) first polyvinylpyrrolidone is dropped in appropriate dehydrated alcohol, be mixed with polyvinylpyrrolidone dehydrated alcohol, drop into nano-zirconium carbide subsequently, high-speed stirring dispersion makes nano-zirconium carbide be uniformly dispersed completely in the solution, drop into Mg powder subsequently, after continuing dispersed with stirring 20-30min, mixed slurry is dropped into grinding in ball grinder and stir 40-50min, finally by the process of gained slurry drying, remove dehydrated alcohol completely, gained mixed powder is for subsequent use, and wherein the volume ratio of dehydrated alcohol and Mg powder is 1-1.5:1;

(2) mixed powder that step (1) prepares is mixed with other leftover materials; fully be uniformly mixed in rear input resistance furnace; under shielding gas atmosphere, be heated to 700-750 DEG C while stirring carry out melting process; after the complete melting of material, 20-30min is placed in insulation; finally by the compression moulding of gained melt cast, to obtain final product.

Beneficial effect: the present invention has prepared the high refractory alloy of Mg-Al-Zn system, and the Mn of blending wherein, the element such as Ca and nano level Ta, obtain more high performance matrix material, improve the utilization ratio of element, in addition, using polyvinylpyrrolidone ethanol solution as medium, nano-zirconium carbide is scattered in wherein, again by itself and Mg powder mixed grinding, nano-zirconium carbide is evenly wrapped up and is scattered in Mg powder, what mix with other metallic element in follow-up fusion process is also more abundant, mode modified effect than direct blending is better, the magnesium alloy materials of preparation has high hardness and toughness concurrently, wear resistance and corrosion resistance is splendid, the automobile component processing characteristics prepared with this material and use properties all improve.

Embodiment

Embodiment

The magnesium alloy materials of the present embodiment is made up of the raw material of following weight part: Al powder 6.5wt.%, Zn powder 3.5wt.%, Mn powder 2wt.%, Ca powder 0.2wt.%, nanometer Ta powder 1.5wt.%, nano-zirconium carbide 1.5wt.%, polyvinylpyrrolidone 0.01wt.%, dehydrated alcohol are appropriate, impurity element≤0.01wt.%, surplus are Mg powder.

Its preparation method is:

(1) first polyvinylpyrrolidone is dropped in appropriate dehydrated alcohol, be mixed with polyvinylpyrrolidone dehydrated alcohol, drop into nano-zirconium carbide subsequently, high-speed stirring dispersion makes nano-zirconium carbide be uniformly dispersed completely in the solution, drops into Mg powder subsequently, after continuing dispersed with stirring 25min, mixed slurry is dropped into grinding in ball grinder and stirs 40min, finally by the process of gained slurry drying, remove dehydrated alcohol completely, gained mixed powder is for subsequent use, and wherein the volume ratio of dehydrated alcohol and Mg powder is 1.2:1;

(2) mixed powder that step (1) prepares is mixed with other leftover materials; fully be uniformly mixed in rear input resistance furnace; under shielding gas atmosphere, be heated to 730 DEG C while stirring carry out melting process; after the complete melting of material, 25min is placed in insulation; finally by the compression moulding of gained melt cast, to obtain final product.

The obtained magnesium alloy of the present embodiment is materialsed and is carried out the performance test results and be: the tensile strength under normal temperature: 316.2MPa, unit elongation: 11.5%, hardness: 137HV, under 200 DEG C of conditions, tensile strength reaches 294MPa, unit elongation is 9.3%, and the more congener ordinary magnesium alloy of wear resistance improves 60.3%.

Claims (2)

1. the Mg-Al-Zn series magnesium alloy material for the nano silicon carbide modified zirconia of casting of automobile component, it is characterized in that, this magnesium alloy materials is made up of the raw material of following weight percent: Al powder 5-8wt.%, Zn powder 3-4wt.%, Mn powder 1-2wt.%, Ca powder 0.2-0.3wt.%, nanometer Ta powder 1-2wt.%, nano-zirconium carbide 1-2wt.%, polyvinylpyrrolidone 0.01-0.02wt.%, dehydrated alcohol are appropriate, impurity element≤0.01wt.%, surplus are Mg powder.

2. the preparation method of a kind of Mg-Al-Zn series magnesium alloy material of the nano silicon carbide modified zirconia for casting of automobile component as claimed in claim 1, it is characterized in that, described preparation method is:

(1) first polyvinylpyrrolidone is dropped in appropriate dehydrated alcohol, be mixed with polyvinylpyrrolidone dehydrated alcohol, drop into nano-zirconium carbide subsequently, high-speed stirring dispersion makes nano-zirconium carbide be uniformly dispersed completely in the solution, drop into Mg powder subsequently, after continuing dispersed with stirring 20-30min, mixed slurry is dropped into grinding in ball grinder and stir 40-50min, finally by the process of gained slurry drying, remove dehydrated alcohol completely, gained mixed powder is for subsequent use, and wherein the volume ratio of dehydrated alcohol and Mg powder is 1-1.5:1;

(2) mixed powder that step (1) prepares is mixed with other leftover materials; fully be uniformly mixed in rear input resistance furnace; under shielding gas atmosphere, be heated to 700-750 DEG C while stirring carry out melting process; after the complete melting of material, 20-30min is placed in insulation; finally by the compression moulding of gained melt cast, to obtain final product.