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US 7,404,832 B2Granted
Method for producing cubic boron nitride abrasive grains
AssigneeShowa Denko K.K.
InventorsHirohiko Ohtsubo, Eiji Ihara, Takuya Okubo, Makoto Kasahara, Makoto Iizuka
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Abstract
The present invention relates to a method for producing cubic boron nitride abrasive grains used for producing a grinding wheel, etc., and to cubic boron nitride abrasive grains. The method comprises maintaining a mixture containing hexagonal boron nitride and seed crystals of cubic boron nitride under pressure and temperature conditions where cubic boron nitride remains thermodynamically stable, characterized in that the seed crystals contain cubic boron nitride twin crystals.
Claims4
A method for producing cubic boron nitride abrasive grains comprising:
- (A) a step of providing a mixture containing hexagonal boron nitride and seed crystals of cubic boron nitride, said seed crystals containing cubic boron nitride twin crystals;
- and
- (B) subjecting the mixture of step (A) to pressure and temperature conditions in which cubic boron nitride remains thermodynamically stable to transform hexagonal boron nitride to cubic boron nitride,
- wherein the cubic boron nitride abrasive grains consist essentially of mono-crystalline particles.
1 more element
Dependencies are inferred from the claim text.