Cbn/cbn composite masses and their preparation

Details Cbn/cbn composite masses and their preparation Cbn/cbn composite masses and their preparation

C - Chemistry, Metallurgy

04

B

C04B 35/58 (2006.01) C01B 21/064 (2006.01) C04B 35/5831 (2006.01)

Patent

CA 2056497

60SD00455 CBN/CBN COMPOSITE MASSES AND THEIR PREPARATION ABSTRACT OF THE DISCLOSURE Broadly, the present invention is directed to a high pressure/high temperature (HP/HT) process for making polycrystalline CBN composite masses from graphitic boron nitride (GBN) in the substantial absence of catalytically-active material. The present invention specifically comprises subjecting a mixture of different structural forms of GBN to simultaneous conversion of each for making a CBN/CBN composite mass. Pyrolytic boron nitride/hexagonal boron nitride (PBN/HBN) mixtures are ideally suited for conversion into the inventive CBN/CBN composite masses of the present invention.

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