Annealing natural or synthetic diamond crystal

Details Annealing natural or synthetic diamond crystal Annealing natural or synthetic diamond crystal

C - Chemistry, Metallurgy

01

B

148/3.6

C01B 31/06 (2006.01) B01J 3/06 (2006.01)

Patent

CA 1112134

ABSTRACT OF THE DISCLOSURE Type Ib diamond crystal is annealed at an annealing temperature ranging from about 1500°C to about 2200°C under a pressure which prevents significant graphitization of the diamond during the annealing to convert at least about 20% of the total amount of type Ib nitrogen present in the crystal to type Ia nitrogen. Where the diamond crystal is of gem quality the lighter color associated with the type Ia crystal isusually preferred. The type Ia crystal is also harder and stronger for use as an abrasive. The crystal norphology is unchanged in the annealing process. Annealing of synthetic crystal results in novel type Ia crystal forms not found in nature such as the cubo-octahedral form, particularly preferred for use in diamond saw blades.

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