Graphene enhanced aluminium-based silicon carbide composite, preparation method and application thereof

Abstract

The invention relates to a graphene enhanced aluminium-based silicon carbide composite and a preparation method thereof. The composite comprises the following substances by volume percent: 40% to 70% of silicon carbide and 0.5% to 5% of graphene, and the balance being aluminium alloy. The composite is prepared through the powder metallurgy method and is obtained through the steps of blending, powder mixing, bagging, vacuum degassing and hot iso-hydrostatic forming treatment. The composite has the advantages of high thermal conductivity, high strength, high plasticity, light weight, good thermal diffusivity, isotropy, and the like, and becomes a second-generation electronic packaging material with wide application.

Description

technical field [0001] The invention relates to a graphene-reinforced aluminum-based silicon carbide composite material, a preparation method and an application thereof. Background technique [0002] The first generation of electronic packaging materials includes Cu, Al, Kovar alloy, Invar alloy, W, Mo alloy, etc. These materials usually have outstanding performance in some aspects, but there are many defects in their comprehensive performance. Kovar alloy has a low coefficient of thermal expansion and good processability, but its thermal conductivity is poor. The thermal expansion coefficient and thermal conductivity of Cu / Mo alloy and Cu / W alloy are relatively ideal, but their density is relatively high, and their machinability is not good. [0003] The thermal expansion coefficient of aluminum silicon carbide composite material (Al / SiC composite material) is 8~12×10 -6 K -1 , the thermal conductivity is as high as 170W / (m·K), which has a very high market potential val...

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Problems solved by technology

This method has the advantages of simple forming and no need for subsequent complicated mechanical processing, but there are problems such as uneven distribution of reinforcement phases and pore defects, which lead to anisotropy of material properties, large surface, uncontrollable volume addition of silicon carbide and other enhancements. Defects such as phase (e.g. graphene) content

Moreover, the method prepares graphene / silicon carbide reinforced aluminum matrix composites by preparing SiC ceramic preforms by pressure infiltration, and needs to heat the aluminum liquid to 700-750 ° C, which has control difficulties and safety problems; and adopts The method of ball milling (about 10 to 20 hours) adds the graphene ethanol dispersion to the aluminum silicon carbide composite material, and there are defects such as insufficient mixing

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