Cubic boron nitride - from hexagonal boron nitride and transition metal cpd initiators for abrasive tools

Cubic BN is made from a mixture containing hexagonal BN, and, as initiators, one or more borides nitrides, silicides, or germanides of transition metals of Groups IV, V, VI, and VIII at pressure >55 kilobars at above 1500 degrees C. There may be 40-2% initiators and the reaction time is 2-5 mins....

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