Production of cubic boron nitride

Details Production of cubic boron nitride Production of cubic boron nitride

C - Chemistry, Metallurgy

01

B

23/7

C01B 21/06 (2006.01) B01J 27/24 (2006.01) C01B 21/064 (2006.01)

Patent

CA 1072296

ABSTRACT OF DISCLOSURE A method of making elongate cubic boron nitride particles including the steps of providing a reaction zone, placing in the reaction zone a sleeve of hexagonal boron nitride around a core of catalyst for cubic boron nitride formation, the weight ratio of hexagonal boron nitride to catalyst being in the range 10:1 to 3:1 and the catalyst being selected from alkali metals, alkaline earth metals and nitrides thereof and subjecting the contents of the: reaction zone to conditions of temperature and pressure suitable for cubic boron nitride formation. This method produces novel cubic boron nitride particles which are characterised by a long axis and a short transverse axis, the ratio of the long axis to the short axis being at least 3 : 1 and the long axis being in the <111> crystallographic direction.

231085

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