Patent ID: 6508996
Filing Date: 2003-01-21
Classification: B01J,C04B

Abstract:
A method for producing cubic boron nitride comprising keeping hexagonal boron nitride under temperature and pressure conditions within the range of stability of cubic boron nitride, in the presence of (i) at least one compound selected from the group consisting of amides and imides of alkali metals and alkaline earth metals, (ii) at least one compound selected from the group consisting of carbides of alkali metals and alkaline earth metals and (iii) a boron source, to convert the hexagonal boron nitride to cubic boron nitride, wherein said boron source is used such that a total number of boron atoms making up the boron source is in a range of 0.05 to 15 parts to 100 parts by a number of molecules of hexagonal boron nitride.