The physical and chemical processes occurring at high pressures (8-9 GPa) and temperatures (up to 2400⁰ C) in the system of diamond particles of 3 – 5 μm in size with addition of nickel in amount of 1 – 2 % vol were investigated. Nickel was deposited on the surfaces of diamond particles as the layers near of 10 nm thickness without sp²-carbon formation in the final product. The deposition was performed by means of the dusty plasma technique in the RF plasma. The coatings with two different types of surface morphology – flat dense or dendritic were obtained depending on the plasma parameters. In the course of the diamond composite powder sintering the processes of the nickel recrystallization and the graphitization of diamond were observed at the temperatures more than 800⁰ C. At the sintering temperatures more than 1400⁰ C the graphite-like carbon is present in the diamond compacts as two phases with different interplanar spaces d₀₀₂. The absolute decrease of non-diamond carbon content in the specimens and relative increase of the graphite-like carbon with “low” interplanar distance as the sintering temperature increase were established.

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