Preparation method of high-thermal-conductivity composite material based on graphitized polydopamine coated metal particles

Abstract

The invention discloses a preparation method of a high-thermal-conductivity composite material based on graphitized polydopamine coated metal particles. The method comprises the following steps of: blending metal particles coated with a layer of thickness-controllable polydopamine with a carbon-based filler by using high thermal conductivity of graphene in the in-plane direction, isotropic thermalconductivity of metal and adhesivity of polydopamine, connecting a graphene sheet layer by using the adhesion of polydopamine, and finally, graphitizing polydopamine and melting metal particles through high-temperature compression treatment, thereby obtaining the high-thermal-conductivity composite material. According to the preparation method, high thermal conductivity of metal and graphitized polydopamine is utilized, and an efficient thermal conduction channel is built between graphene layers, so that the high thermal performance of the material in the thickness direction is effectively improved, the defect of poor thermal conductivity of the material in the thickness direction is overcome, and the high-performance thermal conduction material is prepared.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a method for preparing a graphene / metal particle composite material with high thermal conductivity, in particular to a carbon-based composite material with high thermal conductivity along the thickness direction and the horizontal direction. method. Background technique [0002] With the miniaturization and densification of electronic appliances, the requirements for thermal conductivity and electrical performance of related components are getting higher and higher. For example, the current common tablet computer and electronic appliances have increasingly diversified functions while the volume is continuously reduced. The ensuing problem is that electronic devices will generate a lot of heat during high-speed operation, and long-term use will cause the heat accumulation of electronic products to appear as an obvious heating phenomenon to the outside, which will cause ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, have significant anisotropic thermal conductivity for existing graphene material, promptly only have high thermal conductivity (greater than 1000W / (m·K) along graphene plane ) and in the thickness direction perpendicular to its horizontal plane, the thermal conductivity is too low (less than 10W / (m K)), and a method for preparing a graphene-based composite material with high thermal conductivity along the horizontal direction and thickness direction is provided , the thermal conductivity of the prepared composite material along the plane is as high as 800W / (m·K), and the thermal conductivity along the thickness direction is above 80W / (m·K).

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