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GR reinforced magnesium alloy-based composite material wire and preparation method

A composite material and magnesium alloy technology, which is applied in the preparation of magnesium alloy-based composite material wire, and in the field of magnesium alloy-based composite material wire, can solve the problems of GR easy reunion or reconstruction, cumbersome preparation process, and component segregation. Achieve the effects of avoiding micro-cracks at the interface, expanding the application field, and high anti-friction characteristics

Active Publication Date: 2020-04-24
西安诺高镁新材料科技有限公司
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Problems solved by technology

For example, the patent "A Preparation Method for Graphene-Reinforced Magnesium-Based Composite Material" (Application No.: 201910031951.8, Publication No.: CN109593985A, Publication Date: 2019.04.09) discloses that reduced graphene oxide, nitric acid Graphene-reinforced magnesium-based composites made of lanthanum, nickel acetate, and magnesium alloys can uniformly disperse graphene in the matrix, but the preparation process is cumbersome.
"A Die-casting Preparation Method for Graphene-Reinforced Magnesium-Based Composite Materials" (Application No.: 201811547242.7, Publication No.: CN109371273A, Publication Date: 2019.02.22) discloses a method for preparing graphene-reinforced magnesium-based composite materials by semi-solid die-casting , when the composite material is prepared by melting and casting, defects such as material composition segregation, shrinkage cavity, and porosity will appear during the melting and casting process, resulting in lower performance of the material
At the same time, due to the difference in density between GR and the magnesium matrix, it is difficult for graphene to disperse uniformly in the magnesium alloy melt; and at high temperature, GR is easy to re-agglomerate or restructure, which weakens the dispersion effect of GR itself and has May lose the advantages of GR, deteriorating the performance of composite materials
Composite materials prepared by ordinary sintering methods have problems such as poor compactness and weak interfacial bonding, and the yield is low, making it difficult to achieve large-scale production
[0005] Although metal matrix composites have been developed for more than 40 years, basic research on the composite mechanism and interface strengthening mechanism of magnesium-based composites is still insufficient, and its preparation technology needs to be improved and perfected urgently. Performance needs further improvement

Method used

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  • GR reinforced magnesium alloy-based composite material wire and preparation method

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preparation example Construction

[0039] The present invention provides a method for preparing the above-mentioned GR reinforced magnesium alloy-based composite material wire, which includes the following steps:

[0040] Step 1, high energy ball milling:

[0041] Weigh the following raw materials according to weight percentages: 0.5-1.5% of GR powder, the balance being magnesium alloy powder, and the sum of the weight percentages of the above components is 100%;

[0042] Place GR powder and magnesium alloy powder in a high-energy ball mill at 70-100 rpm under the protection of argon gas for 25-36 hours;

[0043] In step 1, the GR powder is a single-layer graphene dry powder; the magnesium alloy powder is 250-400 mesh, any standard grade is AZ series or ZK series magnesium alloy powder, specific magnesium alloy powder or rare earth magnesium alloy powder as required.

[0044] In step 1, the ball-to-material ratio of the ball mill is 6:10.

[0045] The grinding balls used in step 1 are: 12mm diameter grinding balls and cap...

Embodiment 1

[0058] 250 mesh AZ91 alloy powder is selected as the matrix of the composite material, weighed according to the weight ratio, 0.5% GR powder, the rest is 250 mesh AZ91 powder, and the sum of the weight percentages of the above components is 100%. Use Φ12mm grinding balls and capsule grinding balls, the number of grinding balls and capsule grinding balls are the same, and the weight of the grinding balls is 60% of the weight of GR and AZ91 powder to be ball milled, that is, the ball-to-battery ratio of the ball mill is 6:10.

[0059] Put the above-mentioned powders and grinding balls into a ball mill tank together, and mix the powders in a high-energy ball mill at a speed of 70 rpm under the protection of argon for 25 hours. Mix uniformly through ball milling machine to avoid GR reconstruction and multilayering;

[0060] Put the completely mixed and uniform GR and AZ91 powder mixture into a special reciprocating extrusion device at 250°C with a reciprocating extrusion ratio of 10 an...

Embodiment 2

[0063] Select 400 mesh ZK60 alloy powder as the matrix of the composite material, weigh it according to the weight ratio, 1% GR powder, and the rest is 400 mesh ZK60 powder, and the sum of the weight percentages of the above components is 100%. Use Φ12mm grinding balls and capsule grinding balls, the number of grinding balls and capsule grinding balls is the same, and the weight of the grinding balls is 60% of the weight of GR and ZK60 powder to be ball milled, that is, the ball-to-battery ratio of the ball mill is 6:10.

[0064] Put the above-mentioned powders and grinding balls into a ball mill tank together, and mix the powders in a high-energy ball mill under the protection of argon at a speed of 100 rpm for 36 hours. Mix uniformly through ball milling machine to avoid GR reconstruction and multilayering;

[0065] Put the completely mixed and uniform GR and ZK60 powder mixture into a special reciprocating extrusion device. At 300°C, the reciprocating extrusion with an extrusion...

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Abstract

The invention discloses a GR reinforced magnesium alloy-based composite material wire. The GR reinforced magnesium alloy-based composite material wire comprises the following raw materials in percentage by weight: 0.5-1.5% of GR powder and the balance magnesium alloy powder, and the sum of the weight percentages of the components is 100%. The problems of multiple stratification and burning loss ofGR are avoided, the problem of the interface between single-layer graphene GR and magnesium alloy grains is solved, the reinforcing effect of the GR on a matrix is fully exerted, and interface microcracks are avoided. The invention also provides a preparation method of the composite material wire. The method comprises the following steps: 1, high-energy ball milling; and 2, extrusion forming, specifically, extrusion forming is carried out on the GR powder and the magnesium alloy powder subjected to ball milling in the step 1 in two steps, firstly reciprocating extrusion is carried out, and then normal forward extrusion is carried out, so that the graphene-reinforced magnesium alloy-based composite material wire is prepared.

Description

Technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and specifically relates to a GR-reinforced magnesium alloy-based composite material wire. The invention relates to a preparation method of the GR-reinforced magnesium alloy-based composite material wire. Background technique [0002] In recent years, because magnesium-based composite materials have high specific strength, elastic modulus, hardness and dimensional stability, as well as excellent wear resistance, corrosion resistance, vibration damping performance, high temperature performance and good electromagnetic shielding, high electronegative It has gained more and more attention and application in the fields of aerospace, military product manufacturing, automobile lightweight, electronics and transportation industry. [0003] Since the strengthening effect of the composite material depends largely on the ability to transfer the stress from the matrix to the stronger reinfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C23/00
CPCC22C1/0408C22C1/05C22C23/00
Inventor 徐春杰任国璐孙蕾李岩武向权郭灿张忠明曾凡宏D·谢赫特曼
Owner 西安诺高镁新材料科技有限公司
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