Silicon carbide reinforced metal matrix composite with micro orientated structure and preparation method thereof

A composite material, silicon carbide technology, used in magnesium alloy and aluminum alloy matrix composite materials and their preparation, the field of metal magnesium, can solve the problem of reducing the integrity and coherence of the matrix alloy, reducing the plasticity and toughness of the material, and having no toughening mechanism, etc. problems, to achieve considerable application prospects, enhanced mechanical properties, and excellent comprehensive mechanical properties.

Inactive Publication Date: 2018-11-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existing composite materials and their preparation methods increase the strength, hardness and wear resistance of the materials by adding uniformly dispersed silicon carbide reinforcement phases in the matrix of magnesium alloys and aluminum alloys. The reduction of toughness is mainly due to the fact that the plasticity and toughness of the composite material are mainly contributed by the matrix alloy, while the addition of silicon carbide reduces the integrity and continuity of the matrix alloy while introducing brittle phases, and does not introduce effective toughening. mechanism

Method used

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  • Silicon carbide reinforced metal matrix composite with micro orientated structure and preparation method thereof
  • Silicon carbide reinforced metal matrix composite with micro orientated structure and preparation method thereof
  • Silicon carbide reinforced metal matrix composite with micro orientated structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] In this example, a silicon carbide whisker-reinforced magnesium-based composite material with a microscopic oriented structure was prepared. The raw materials used mainly include silicon carbide whiskers (average diameter 2.5μm, length 50-200μm), silicon oxide powder (average particle size 20nm), deionized water, polyvinyl alcohol, hydroxypropyl methylcellulose powder (average particle size 180 μm), polyacrylic acid and pure metal magnesium, the specific preparation process is as follows:

[0037] (A) Preparation of slurry

[0038] Add 700g of deionized water to a 1000ml plastic jar, add 90g of silicon carbide whiskers, 3.6g of silicon oxide powder, 31.5g of polyvinyl alcohol and 1.8g of polyacrylic acid into the bottle, and stir at a speed of 60rpm until solid The powder is evenly dispersed in water. Place the jar in a constant temperature water bath at 70°C, keep it warm for 30 minutes, slowly add 12.6g of hydroxypropyl methylcellulose powder into the bottle, and st...

Embodiment 2

[0049] In this example, a silicon carbide sheet-reinforced magnesium alloy-based composite material with a microscopic oriented structure was prepared. The raw materials used mainly include nano-silicon carbide powder (average particle size 100nm), nano-yttrium oxide powder (average particle size 30nm), nano-alumina powder (average particle size 20nm), deionized water, polyvinyl alcohol, hydroxyl Propyl methyl cellulose powder (average particle diameter 180 μm), polyacrylic acid and AZ91D type magnesium alloy (in terms of mass percentage, the composition is 9.0% aluminum, 0.5% zinc, 0.2% manganese, the rest is magnesium), the specific preparation process is as follows :

[0050] (A) Preparation of slurry

[0051] Add 185g of deionized water to a 500ml plastic jar, add 45g of nano-silicon carbide powder, 2.853g of nano-yttrium oxide powder, 2.147g of nano-alumina powder, 8g of polyvinyl alcohol and 1g of polyacrylic acid into the bottle , stirring at a speed of 60rpm until th...

Embodiment 3

[0062] In this example, a silicon carbide sheet-reinforced aluminum alloy matrix composite material with a microscopic oriented structure was prepared. The raw materials used mainly include nano-silicon carbide powder (average particle size 100nm), nano-yttrium oxide powder (average particle size 30nm), nano-alumina powder (average particle size 20nm), deionized water, polyvinyl alcohol, hydroxyl Propylmethylcellulose powder (average particle size 180 μm), polyacrylic acid and ZL303 aluminum alloy (by mass percentage, the composition is 1.0% silicon, 0.2% manganese, 5.2% magnesium, and the rest is aluminum), the specific preparation process is as follows:

[0063] (A) Preparation of slurry

[0064] The operation of this step is the same as step (A) in Example 2.

[0065] (B) Preparation of porous body

[0066] The operation of this step is the same as step (B) in Example 2.

[0067] (C) Body compression treatment

[0068] The operation of this step is similar to that of st...

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Abstract

The invention relates to a silicon carbide reinforced metal matrix composite with a micro orientated structure and a preparation method thereof. The composite consists of silicon carbide with a volumefraction of 5-90% and metal, and has the micro orientated structure which is expressed as oriented arrangement of the silicon car bide in a metal matrix. The preparation method of the composite comprises the following steps of: firstly preparing water-based slurry containing silicon carbide powder; processing the slurry by utilizing freeze casting and vacuum freeze drying to obtain a green body with an orientated porous structure; compressing the green body and removing organic matters in the green body; carrying out sintering to obtain an oriented porous skeleton of silicon carbide; and finally infiltrating the skeleton by utilizing liquid metal bath, and carrying out solidification and cooling to obtain the silicon carbide reinforced metal matrix composite with the micro orientated structure. The composite has excellent properties such as light mass, high intensity, wear resistance and high-temperature creep resistance, the micro structures and properties of the composite can be effectively controlled through adjusting the preparation process, and the composite has considerable application prospect when serving as a structural material.

Description

technical field [0001] The invention relates to the field of silicon carbide-reinforced metal-matrix composite materials, in particular to a metal magnesium, magnesium alloy and aluminum alloy-based composite material having a microscopic directional structure and reinforced with silicon carbide, and a preparation method thereof. Background technique [0002] Reducing the weight of structural materials can reduce the weight of structural parts on the premise of meeting the mechanical properties required for safe service, thereby helping to save energy and reduce environmental pollution, so it has important practical significance and demand. Especially in the field of transportation, the lightweight of automobiles can improve the fuel efficiency of automobiles, reduce fuel consumption and exhaust emissions, so it has become one of the main trends in today's automobile development. The realization of material lightweight mainly depends on its mechanical properties such as spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C21/00C22C23/00C22C29/06C22C32/00
CPCC22C1/1015C22C1/1036C22C21/00C22C23/00C22C29/065C22C32/0063
Inventor 刘增乾张明阳张健谈国旗张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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