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Abstract
A composite with hardness over 55 GPa is obtained by cobalt infiltration into a nanodiamond at a pressure of 8 GPa. Graphitization of a nanodiamond in pores is found to precede cobalt infiltration into them. In the presence of cobalt, graphite-like carbon is inversely transformed into diamond with a slight time delay and the nanodiamond recrystallizes, a polycrystal diamond frame being formed. The minimum cobalt concentration in compacts required for nanodiamond sintering using the infiltration technique is 6 vol %.
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