CN105256211A - Graphene modifying Mg-Al-Mn magnesium alloy material for casting automobile parts and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of magnesium alloy preparation, in particular to a graphene modifying Mg-Al-Mn magnesium alloy material for casting automobile parts and a preparation method thereof. The material belongs to Mg-Al-Mn magnesium alloy and is doped with Nd, Mo and the like, so that the organization structure of the alloy material is further improved, and the functions of refining grains and improving the mechanical property are achieved. In addition, a polyvinylpyrrolidone absolute ethyl alcohol solution is used as a medium, graphene is scattered into the solution and then is mixed and ground with Mg powder, and the graphene is evenly wrapped scattered in the Mg powder. In the subsequent smelting process, the graphene is mixed with other metallic elements more fully; compared with a traditional direct mixing mode, the method is more efficient, and the prepared magnesium alloy material achieves corrosion prevention and abrasion resistance, is light and high in strength and has both good toughness and rigidity. The machinability and the using performance of the automobile parts prepared from the material are both improved.

Description

Mg-Al-Mn series magnesium alloy material of a kind of Graphene modification for casting of automobile component and preparation method thereof

Technical field

The present invention relates to magnesium alloy materials preparing technical field, Mg-Al-Mn series magnesium alloy material being specifically related to a kind of Graphene modification 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-Mn series magnesium alloy material that the invention provides a kind of Graphene modification 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-Mn series magnesium alloy material of the Graphene modification 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 4-6wt.%, Mn powder 1-2wt.%, Nd powder 0.1-0.2wt.%, Mo powder 0.02-0.03wt.%, Graphene 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-Mn series magnesium alloy material of described a kind of Graphene modification for casting of automobile component is:

(1) first polyvinylpyrrolidone is dropped in appropriate dehydrated alcohol, be mixed with polyvinylpyrrolidone dehydrated alcohol, drop into Graphene subsequently, high-speed stirring dispersion makes Graphene be uniformly dispersed completely in the solution, drops into Mg powder subsequently, after continuing dispersed with stirring 20-30min, mixed slurry is dropped into grinding in ball grinder and stirs 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 Mg-Al-Mn series magnesium alloy, and the Nd of blending wherein, the elements such as Mo, further improve the weave construction of alloy material, there is crystal grain thinning, improve effect of mechanical property, in addition, using polyvinylpyrrolidone ethanol solution as medium, by graphene dispersion in wherein, again by itself and Mg powder mixed grinding, graphene uniform is wrapped up to be scattered in Mg powder, what mix with other metallic element in follow-up fusion process is also more abundant, more traditional direct blending mode is more efficient, the magnesium alloy materials anticorrosion antiwear of preparation, high-strength light, have good toughness and rigidity concurrently, 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 5.0wt.%, Mn powder 2wt.%, Nd powder 0.2wt.%, Mo powder 0.02wt.%, Graphene 1.5wt.%, polyvinylpyrrolidone 0.02wt.%, 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 Graphene subsequently, high-speed stirring dispersion makes Graphene be uniformly dispersed completely in the solution, drops into Mg powder subsequently, after continuing dispersed with stirring 20min, 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 710 DEG C while stirring carry out melting process; after the complete melting of material, 20min 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: 318MPa, unit elongation: 16.4%, hardness: 134HV, under 200 DEG C of conditions, tensile strength reaches 292MPa, unit elongation is 12.2%, and the more congener ordinary magnesium alloy of wear resistance improves 61.2%.

Claims (2)

1. the Mg-Al-Mn series magnesium alloy material for the Graphene modification 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 4-6wt.%, Mn powder 1-2wt.%, Nd powder 0.1-0.2wt.%, Mo powder 0.02-0.03wt.%, Graphene 1-2wt.%, polyvinylpyrrolidone 0.01-0.02wt.%, dehydrated alcohol are appropriate, impurity element≤0.01wt.%, surplus are Mg powder.

2. the preparation method of the Mg-Al-Mn series magnesium alloy material of a kind of Graphene modification 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 Graphene subsequently, high-speed stirring dispersion makes Graphene be uniformly dispersed completely in the solution, drops into Mg powder subsequently, after continuing dispersed with stirring 20-30min, mixed slurry is dropped into grinding in ball grinder and stirs 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.