By meanings of natural scale graphite powder, copper-plated flake graphite powder and copper powder, the graphite/copper heat-conducting composite material was produced by vacuum hot-pressing. Then the density, thermal conductivity and coefficient of thermal expansion of the composites were compared. The copper-coated flake graphite composites and natural flake graphite composites with the same volume fraction were observed. The results show that the thermal performance of the former is better than that of the latter. When the graphite volume fraction is 85%, the thermal conductivity of the composite material made of the copper-plated flake graphite powder is 520 W/m. K, and the thermal expansion coefficient is 1.74 ppm/K.

Graphite/copper composites with different composition were produced by cold pressing sintering of copper-plated graphite powder with particle size of 150μm and copper-free graphite powder. The current-carrying friction and wear properties of the graphite/copper composite were studied by using a pin-disk current-carrying friction and wear tester. The wear surface was also analyzed by scanning electron microscope. It is found that the copper-plated graphite powder can effectively reduce the friction factor of the composite material in the range of the test parameters. However, the effect of copper-plated graphite powder on the wear-resisting property is not obvious. As the graphite content increases, the friction factor of the graphite/copper composite is reduced. When the graphite mass fraction is 10%, the wear rate of the composite is the lowest.

In order to improve the lubricating performance of copper by adding graphite particles, we try to produce the copper/graphite composite by using the principle of powder metallurgy. The process of mixing, pressing and sintering is simple and efficient, so we mainly use this method to produce copper/graphite composite. The different parameters such as the particle size, graphite content, sintering temperature and thermal insulation time of the graphite particles were analyzed by means of the Hitachi S-4800 cold field emission scanning electron microscope. And the parameters of the internal structure and the appearance of the copper/graphite composite material are counted. The results show that the microstructure of copper/graphite composites is mainly affected by the particle size of graphite and the amount of graphite. If more small-scale graphite particles are added, the cutting effect of pure copper matrix will be improved.

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