Silicon carbide-hypereutectic silicon aluminum alloy composite material powder, preparation method and product

A composite material, silicon-aluminum alloy technology, applied in the field of powder metallurgy, can solve the problems of restricting the application of ordinary aluminum or aluminum alloy, easy to cause wear, etc., and achieve the effect of eliminating hard phase segregation, reducing contact probability, and lowering melting point

Active Publication Date: 2018-03-09
天津佐源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aluminum or aluminum alloy is considered to be an ideal material to replace iron. Aluminum or aluminum alloy has the characteristics of light weight, reasonable strength and good processability, and has been widely used as a substitute for iron materials in mechanical parts such as shells and structures , but the Mohs hardness of ordinary aluminum or aluminum alloy is low, only 2.75, which is prone to wear and tear, thus limiting the application of ordinary aluminum or aluminum alloy in sliding / friction parts

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  • Silicon carbide-hypereutectic silicon aluminum alloy composite material powder, preparation method and product

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Effect test

Embodiment 1

[0054] The invention provides a silicon carbide-hypereutectic silicon-aluminum alloy composite material powder. The raw materials include the following components according to weight percentage: 5% silicon carbide;

[0055] And alloy composition: 60% silicon, 0.5% iron and 34.5% aluminum.

[0056] The silicon carbide in the composite material powder has a particle size of 1-20 μm;

[0057] The grain size of primary silicon grains precipitated in the composite material powder is 1-10 μm.

[0058] The thermal expansion coefficient of the silicon carbide-hypereutectic silicon aluminum alloy composite powder is 7.5×10 -6 / °C.

[0059] The particle size of the silicon carbide-hypereutectic silicon aluminum alloy composite material powder is 10-200 μm.

[0060] The preparation method of described silicon carbide-hypereutectic silicon aluminum alloy composite material powder, comprises the following steps:

[0061] (1) Melting the alloy components to obtain an alloy melting beam,...

Embodiment 2

[0068] The invention provides a silicon carbide-hypereutectic silicon-aluminum alloy composite material powder. The raw materials include the following components according to weight percentage: 50% silicon carbide;

[0069] And alloy composition: 20% silicon, 1.0% copper, 2.0% magnesium and 27% aluminum.

[0070] The silicon carbide in the composite material powder has a particle size of 1-20 μm;

[0071] The grain size of primary silicon grains precipitated in the composite material powder is 1-10 μm.

[0072] The thermal expansion coefficient of the silicon carbide-hypereutectic silicon aluminum alloy composite powder is 12.6×10 -6 / °C.

[0073] The particle size of the silicon carbide-hypereutectic silicon aluminum alloy composite material powder is 10-200 μm.

[0074] The preparation method of described silicon carbide-hypereutectic silicon aluminum alloy composite material powder, comprises the following steps:

[0075] (1) Melting the alloy components to obtain an a...

Embodiment 3

[0083] The invention provides a silicon carbide-hypereutectic silicon-aluminum alloy composite material powder. The raw materials include the following components according to weight percentage: 5% silicon carbide;

[0084] And alloy composition: 20% silicon, 12% copper, 3.0% magnesium, 10% iron and 50% aluminum.

[0085] The silicon carbide in the composite material powder has a particle size of 1-20 μm;

[0086] The grain size of primary silicon grains precipitated in the composite material powder is 1-10 μm.

[0087] The thermal expansion coefficient of the silicon carbide-hypereutectic silicon aluminum alloy composite powder is 15×10 -6 / °C.

[0088] The particle size of the silicon carbide-hypereutectic silicon aluminum alloy composite material powder is 10-200 μm.

[0089] The preparation method of described silicon carbide-hypereutectic silicon aluminum alloy composite material powder, comprises the following steps:

[0090] (1) Melting the alloy components to obtai...

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Abstract

The invention relates to silicon carbide-hypereutectic silicon aluminum alloy composite material powder. Through adjusting the addition amount of silicon carbide and silicon, the wear resistance, thethermal conductivity, the specific heat capacity, a coefficient of thermal expansion and the strength of the composite material powder can adapt to different sliding/friction mating material, the abrasion is reduced, and the mechanical efficiency is improved. According to a preparation method of the composite material powder provided by the invention, raw material components are combined, a quickchilling spray powder producing process is adopted under an inert atmosphere condition, the size of a primary silicon grain size of the prepared composite material alloy powder is smaller than 10mu m,the prepared composite material alloy powder contains SiC micro grains with the size being 1 to 20mu m, and the alloy powder is quick chilled under the inert atmosphere, so that the oxygen content ofthe alloy powder is reduced, a composite material powder product shows low oxygen content, and a comprehensive mechanical performance and the wear resistance of the product are improved. In addition,the product conforms to a light-weight and miniaturized parts development trend, and has an excellent heat conduction and heat radiation performances, the mechanical efficiency is greatly improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a silicon carbide-hypereutectic silicon-aluminum alloy composite material powder, a preparation method and a product. Background technique [0002] For sliding / friction contact parts, the raw materials currently used are mainly steel materials, but considering the economy and material properties, although steel materials can meet the performance requirements of the mechanical parts, they are used for sliding There are still great deficiencies in sliding and friction parts, including: 1) the Mohs hardness of iron and steel materials is low, for example, the Mohs hardness of iron is only 4-5 grades, and it will be larger than that after being made into sliding or friction parts. When the hard particles of hardness produce relative sliding and friction, it is easy to wear and tear. Long-term wear will lead to changes in the matching dimensions of parts, causing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/08C22C21/02C22C32/00C22C29/06
CPCB22F1/0003B22F9/082B22F2009/0844B22F2009/0868C22C21/02C22C29/065C22C29/067C22C32/0063
Inventor 李珮豪彭波
Owner 天津佐源新材料科技有限公司
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