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mg alloy/al2o3 composite material and preparation method

A composite material and alloy technology, applied in the field of Mg alloy/Al2O3 composite material and its preparation, can solve problems such as inappropriate use of nitrogen-containing atmosphere, inability to achieve metal and ceramic wetting, high brittleness, etc.

Inactive Publication Date: 2018-07-27
JILIN UNIV
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  • Claims
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Problems solved by technology

But for Mg alloys, since Mg and N 2 A large number of reactions will generate Mg 3 N 2 phase, resulting in severe powdering of the alloy and high brittleness, so it is not suitable to use a nitrogen-containing atmosphere, so that the wetting of metal and ceramics cannot be achieved
That is to say, the above pressureless infiltration cannot be used to prepare Mg-based metal-ceramic layered composites

Method used

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Embodiment Construction

[0023] The present invention is described in further detail below by enumerating the embodiment.

[0024] Mg alloy / Al of the present invention 2 o 3 Preparation of composite materials:

[0025] 1. Water-based Al 2 o 3 Preparation of slurry

[0026] Dissolve the dispersant sodium polymethacrylate in the aqueous solution at 40°C, and then mix with Al 2 o 3 Powders were mixed and milled for 6 hours with a planetary ball mill at a rotational speed of 100 r / min to make a ceramic slurry, in which Al 2 o 3 The volume percentage of powder in the whole slurry is 10-40 vol.%, and the content of dispersant is Al 2 o 3 1wt.% of the powder, the slurry after ball milling was vacuum stirred and degassed for 20 minutes, the stirring speed was 80-100r / min, and the water-based Al with a particle size of less than 5μm was obtained 2 o 3 slurry.

[0027] 2. Directional solidification

[0028] Put the above water-based Al 2 o 3 The slurry is poured into a polytetrafluoroethylene mol...

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Abstract

The invention relates to a light-weight and high-strength metal / ceramic composite material, in particular to a Mg alloy / Al2O3 composite material and a preparation method thereof. The Mg alloy / Al2O3 composite material of the present invention is composed of a layered structure Al2O3 matrix prepared by the ice template method and a Mg alloy impregnated and compounded in the interlayer gap of the matrix, and is a layered structure obtained by directional solidification by the ice template method. The Al2O3 green body is soaked in silica sol, and the nano-SiO2 is coated on the surface of the Al2O3 sheet, and then Mg alloy is impregnated in the Ar atmosphere. The composite material has high specific strength, and when the density of the composite material is 2.57g / cm3, its compressive strength can reach 697MPa.

Description

technical field [0001] The invention relates to light weight and high strength metal / ceramic composite material, especially a kind of Mg alloy / Al 2 o 3 Composite materials and methods for their preparation. Background technique [0002] With the development of science and technology, lightweight and high-strength materials are bound to become the development trend in the fields of aerospace, automobile industry and bulletproof armor. Mg alloy has the smallest density among metal materials, which is about 2 / 3 of that of Al alloy, so it becomes the first choice for light structural materials. However, the strength of Mg alloy is low, so it is necessary to increase its strength by compounding and other methods. Ceramic materials have high strength but poor plasticity. Combining the two to obtain a lightweight and high-strength structural material can meet the application requirements. But how to effectively compound is the key factor to determine the performance of Mg allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C23/00C22C32/00
CPCC22C1/1015C22C1/1036C22C23/00C22C32/0036C22C1/1021C22C1/1057
Inventor 沈平刘艳郭瑞芬张恒阿拉腾沙嘎付玉洁姜启川
Owner JILIN UNIV
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