Method for preparing graphene reinforced magnesium-based composite material based on powder thixoforming

A technology of thixotropic deformation and composite materials, which is applied in the field of preparation of graphene-reinforced magnesium-based composite materials, can solve problems such as low density, poor graphene dispersion, and complex shapes, and achieve high density, simple process, and low cost effect

Active Publication Date: 2018-11-20
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] The purpose of the present invention is to solve: (1) the problem of poor dispersion of graphene in graphene-reinforced magnesium-based composite materials prepared by composite casting process; (2) the density of graphene-reinforced magnesium-based composite materials prepared by powder metallurgy is not high, difficult The problem of forming large-sized and complex-shaped products

Method used

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  • Method for preparing graphene reinforced magnesium-based composite material based on powder thixoforming
  • Method for preparing graphene reinforced magnesium-based composite material based on powder thixoforming
  • Method for preparing graphene reinforced magnesium-based composite material based on powder thixoforming

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Embodiment 1

[0034] The process of preparing graphene-reinforced magnesium-based composite material based on thixotropic deformation of the present embodiment is carried out in the following steps:

[0035](1) Add 0.5g of graphene nanosheets with a sheet thickness of 3-10nm and a radial size of 5-10μm into 500ml of absolute ethanol, and use an ultrasonic processor to sonicate for 60min to obtain a graphene ethanol suspension; Atomized spherical ZK61 magnesium alloy powder for -325 mesh was added to 100ml ethanol solution, and graphene ethanol suspension was slowly added dropwise to the ethanol slurry of ZK61 magnesium alloy powder while mechanically stirring to obtain GNP / ZK61 mixed slurry. After mechanically stirring for 120 minutes in a constant temperature water bath at 30°C, the mixed slurry was in a paste state, and the stirring speed was 500 r / min.

[0036] (2) Filter the GNP / ZK61 mixed slurry obtained in step (1), remove the ethanol solution, and then put it in a vacuum drying oven ...

Embodiment 2

[0042] The difference between this embodiment and Example 1 is that the remelting temperature in step (4) is increased to 635°C. Repeat the steps (1), (2) and (3) in Example 1 to obtain the GNP / ZK61 cold-pressed blank; raise the partial remelting temperature of the GNP / ZK61 compact to 635°C, and the remelting time is still 60min. Repeat the step (5) in Example 1 to obtain GNP / ZK61 semi-solid ingot; keep the mold temperature, pressure and pressure holding time in Example 1 unchanged, and obtain GNP / ZK61 magnesium-based composite after thixoforming Material.

Embodiment 3

[0044] The difference between this embodiment and Example 1 or 2 is that the remelting temperature in step (4) is lowered to 620° C., and the others are the same as Example 1 or 2.

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Abstract

The invention discloses a method for preparing a graphene reinforced magnesium-based composite material based on powder thixoforming. The method aims to solve the following problems that: firstly, dispersion of graphene in the graphene reinforced magnesium-based composite material prepared by a composite casting process is poor; and secondly, the graphene reinforced magnesium-based composite material prepared by a powder metallurgic method is not high in compactness, and has difficulty of forming a large-dimension product with a complex shape. The method comprises the following steps of: adopting an ultrasonic and mechanical stirring process for mixing magnesium alloy powder and a graphene nanosheet in alcohol, filtering and drying, pressing mixed powder into blank, heating the blank at asemi-solid-state temperature of the magnesium alloy to obtain semi-solid-state ingot; and performing thixoforming on the semi-solid-state ingot to obtain the graphene reinforced magnesium-based composite material.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite material preparation, and relates to the preparation technology of graphene-reinforced magnesium-based composite material. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, good damping and shock absorption and electromagnetic shielding, high dimensional stability, excellent machining performance and easy recycling and reuse. It is currently the lightest metal structural material in engineering applications. Aerospace, aviation, automobile, rail transit, electronics and military fields have great application potential. However, the mechanical properties of most magnesium alloys, especially the low mechanical properties at high temperature, restrict their wide application. It is well known that particle-reinforced metal matrix composites can not only significantly improve the chamber and high-temperature mechanical prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16C22C1/05C22C23/00
CPCC22C1/05C22C23/00B22F3/16C22C1/12
Inventor 陈体军王平波张斌
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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