Graphene modified high-heat-conductivity aluminum-based composite material and powder metallurgy preparation method

An aluminum-based composite material and graphene modification technology, which is applied in the fields of nanotechnology, nanotechnology, and nanotechnology for materials and surface science, and can solve the problem that the thermal conductivity of the composite material is far away from the theoretical value, and the particle surface The thickness and uniformity of the coating are difficult to control, and the interface modification effect is not ideal, so as to achieve the effects of easy dispersion and adsorption, easy thickness and uniformity, and thickness and uniformity control.

Active Publication Date: 2015-01-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, document 3 "A predictive model for interfacial thermal conductance in surface metallized diamond aluminum matrix composites" (Materials and Design 55 (2014) 257-262) and document 4 "The effect of coating thickness on the thermal conductivity of titanium-coated diamond/aluminum composites" (Journal of Nonferrous Metals of China, 23 (2013) 802-808) has been confirmed from both theoretical and experimental aspects: the thermal conductivity of composite materials varies with the interface coating The thickness increases and drops sharply. Although the surface of diamond and other particles coated with W, Ti and other particles can improve the interface bonding and thermal conductivity of the composite

Method used

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  • Graphene modified high-heat-conductivity aluminum-based composite material and powder metallurgy preparation method
  • Graphene modified high-heat-conductivity aluminum-based composite material and powder metallurgy preparation method

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Effect test

Embodiment 1

[0038] Soak the diamond with a particle size of 20 μm in strong acid, wash it with pure water until it is neutral, and dry it, put it into the graphene dispersion and stir for 2.0 hours, and rinse it with water after filtering to obtain graphene-modified diamond particles; % volume fraction of graphene-modified diamond particles mixed with pure aluminum powder with a purity of 99.9%, compacted, and sintered at 630°C for 2 hours. The prepared graphene-modified diamond-reinforced aluminum matrix composite has a density of 99.2% and a thermal conductivity of It is 335W / mK.

Embodiment 2

[0040] Soak the diamond with a particle size of 600 μm in strong acid, wash it with pure water to neutrality, and dry it, put it into the graphene dispersion and stir for 2.0 hours, and rinse it with water after filtering out to obtain graphene-modified diamond particles; 65 % volume fraction of graphene-modified diamond particles mixed with pure aluminum with a purity of 99.9%, compacted, and sintered at 645°C for 2 hours. The prepared graphene-modified diamond-reinforced aluminum matrix composite has a density of 98.9% and a thermal conductivity of 846W / mK.

Embodiment 3

[0042] Soak silicon carbide with a particle size of 300 μm in strong acid, wash it with pure water until it is neutral, and dry it, put it into the graphene dispersion and stir for 2.0 hours, filter it out and rinse it with water to obtain graphene-modified silicon carbide particles; The graphene-modified silicon carbide particle-reinforced aluminum matrix composite material prepared by mixing 45% volume fraction of graphene-modified silicon carbide particles with Al-7% Si aluminum alloy powder, compacted, and sintered at 615°C for 2 hours was 98.6 %, thermal conductivity is 237W / mK.

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Abstract

The invention provides a graphene modified high-heat-conductivity aluminum-based composite material and a powder metallurgy preparation method thereof. The material comprises reinforced grains and an aluminum substrate, wherein the composite boundary of the reinforced grains and the aluminum substrate contains high-heat-conductivity graphene nanosheets. The method comprises the following steps: (1) soaking the reinforced grains with a strong acid solution, subsequently washing with deionized water till being neutral, drying, and removing the surface impurities, thereby obtaining activated reinforced grains; (2) adding the activated reinforced grains into a graphene dispersion liquid, mechanically stirring or performing ultrasonic dispersion, and wrapping the graphene nanosheets on the surface, thereby preparing the graphene modified reinforced grains; and (3) mixing the graphene modified reinforced grains with the aluminum substrate powder, pressing into blanks, and sintering, thereby preparing the graphene modified high-heat-conductivity aluminum-based composite material. The composite material provided by the invention is good in chemical stability, high in thermal conductivity and can be used as a heat management material of a large-power semiconductor device.

Description

technical field [0001] The invention relates to the technical field of metal-based composite materials, in particular to a method for modifying the surface of reinforcement particles by using graphene, and then using powder metallurgy technology to prepare aluminum-based composite materials with high thermal conductivity. Background technique [0002] In recent years, in order to meet the development needs of electronic technology, the research of high thermal conductivity and low expansion metal matrix composites used as thermal management materials has made great progress. Particle-reinforced aluminum matrix composites have become an ideal choice for future electronic packaging materials due to the comprehensive advantages of aluminum matrix and reinforcement particles, light weight, high thermal conductivity, and low expansion. However, the currently selected reinforcement particles are mainly carbon or carbon-containing high thermal conductivity materials, such as silico...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/05B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C22C1/05C22C21/00
Inventor 谭占秋李志强范根莲张荻
Owner SHANGHAI JIAO TONG UNIV
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