Preparation method of aluminum-base graphene composite material

Abstract

The invention discloses a preparation method of an aluminum-base graphene composite material, which comprises the following steps: 1) dispersing graphene in an organic solvent to form a graphene dispersion solution, wherein the organic solvent can not chemically react with aluminum; 2) acidizing interlocking pore foamed aluminum to remove the surface oxidizing layer, and drying; 3) immersing the interlocking pore foamed aluminum treated by the step 2) in the graphene dispersion solution, taking out, and drying to obtain the graphene / foamed aluminum composite; and 4) preheating the graphene / foamed aluminum composite, and rolling to finally obtain the aluminum-base graphene composite material, wherein the step 1) and step 2) can be exchanged, and the mass of the graphene and interlocking pore foamed aluminum is 0.1-10 wt%. The method prevents the high-energy ball mill from damaging graphene in the traditional powder metallurgical technique, can implement effective dispersion by using the foamed aluminum as the framework, is simple in technique, and has obvious industrialized application prospects.

Description

technical field [0001] The invention relates to a preparation process of a composite material, in particular to a preparation method of an aluminum-based graphene composite material. Background technique [0002] Aluminum-carbon composite materials have the characteristics of low density, high thermal conductivity, and designable thermal expansion coefficient. At the same time, they have the advantages of metal processing and welding. They are a new generation of electronic packaging and thermal management materials. The field has great application prospects. Conventional aluminum-carbon composite materials use natural graphite as the main thermally conductive modified filler, and the composite material is likely to be uneven due to the large scale. Moreover, natural graphite is limited by the degree of crystallization and impurity levels, making it increasingly difficult to further improve thermal conductivity. Therefore, it is particularly important to develop new therma...

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Problems solved by technology

[0003] Although theoretical studies have shown that graphene has excellent thermal properties, the complexity of the process and the interfacial reactions of composite materials hinder the industrial production of graphene / aluminum composites.

After searching the existing patents: the patent of CN102329976A is pre-milled on aluminum powder, added to the graphene solution, filtered, dried and then cold-pressed. Finally, it needs to be hot-extruded at high temperature. This process is complicated. In addition, Due to the need for hot extrusion at high temperature to increase the interfacial reaction, the performance of the prepared composite material does not give full play to the performance of graphene, and the thermal conductivity of the composite material is only 145W / m.K

So far, there are still great challenges in the preparation of high thermal conductivity aluminum matrix composites

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