Abstract
The molten salt method was used to plate chromium on the surfaces of MBD (Diamond grains for the Metal Bond tool) and RVD (Diamond grains for Resinoid and Vitrified bond) diamond particles, respectively, to metalize their surfaces. The Cr-coated diamond/copper composites were obtained by vacuum hot pressing method, and the thermal conductivity and coefficient of thermal expansion of the two composites were compared. The results indicate that the thermal conductivity of both composites prepared by Cr-coated diamond particles and copper matrix was greatly improved. The thermal conductivity showed a trend of increasing and then decreasing with the increase of chromium content. The thermal conductivity of RVD diamond/copper composites was up to 483 W m^-1 K^-1, and MBD diamond/copper composites was up to 450 W m^-1 K^-1, and the thermal conductivity of RVD diamond/copper composites was generally higher than that of MBD diamond/copper composites, the CTE of the composites prepared by Cr-coated diamond particles and copper matrix decreased significantly.

Key words
metal matrix composite, RVD diamond, MBD diamond, thermal conductivity, thermal expansion coefficient

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