Graphite-metal heat conduction composite material and preparation method thereof

Abstract

The invention relates to a graphite-metal heat conduction composite material and a preparation method thereof. The graphite-metal heat conduction composite material comprises a metal base body and a graphite composite body distributed in the interior and / or the surface of the metal base body. The graphite composite body comprises graphite particles, a carbide layer and a carbide forming element layer, wherein the carbide layer is combined to the surfaces of the graphite particles, and the carbide forming element layer is combined to the surface of the carbide layer; carbide forming elements comprise B, Si, Cr, W and Mo; carbides comprise a boron carbide, a silicon carbide, a tungsten carbide, a chromium carbide and a molybdenum carbide; and the graphite composite body is combined with the metal base body through the carbide forming element layer. The composite material has the excellent performance and is widely applied.

Description

Technical field [0001] The invention belongs to the field of thermally conductive composite materials. Specifically, the present invention relates to a graphite-metal thermally conductive composite material and a preparation method thereof. Background technique [0002] With the rapid development of the electronic technology industry, more and more heat is dissipated per unit area of ​​devices, which puts more stringent requirements on the performance of thermal management materials. As an important part of the development of electronic packaging materials, materials are required to have high thermal conductivity, low expansion coefficient, light weight, and low cost. However, although the traditional Al / SiC composite materials, Cu / W composite materials and Cu / Mo composite materials and other special alloy materials have low thermal expansion coefficients, they have all undergone special processing, sacrificing the performance of the materials in terms of thermal conductivity an...

AI Technical Summary

Problems solved by technology

However, the difficulty in the preparation of graphite-metal composites lies in: poor wettability and poor bonding between graphite and metal, and in the preparation process of commonly used graphite-metal composites, such as graphite-aluminum reaction will produce easily hydrolyzed phase Al 4 C 3 , the binding capacity between graphite and copper is low

In order to improve the bonding strength between graphite particles and metal, most of the existing processes adopt electroplating and electroless plating. These methods have high requirements on equipment, and the process is complicated. The uniform coating effect on the surface of the powder is not good, and the above problems cannot be solved.

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