Ultrahard diamonds and method of making thereof

Details Ultrahard diamonds and method of making thereof Ultrahard diamonds and method of making thereof

2007-12-18

2007-12-18

Johnson, Edward M. (Department: 1754)

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

Reexamination Certificate

active

11401288

ABSTRACT:
A single crystal diamond grown by microwave plasma chemical vapor deposition annealed at pressures in excess of 4.0 GPa and heated to temperature in excess of 1500 degrees C. that has a hardness of greater than 120 GPa. A method for manufacture a hard single crystal diamond includes growing a single crystal diamond and annealing the single crystal diamond at pressures in excess of 4.0 GPa and a temperature in excess of 1500 degrees C. to have a hardness in excess of 120 GPa.

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