HARD DIAMONDS AND METHOD OF ITS PREPARATION Russian patent published in 2008 - IPC C01B31/06 C30B29/04 C30B25/00

Abstract RU 2325323 C2

FIELD: chemistry.

SUBSTANCE: process of hard monocrystalline diamond preparation compises fixing of inoculating diamond in the holder and its growing by the way of chemical deposition from gaseous phase induced by microwave plasma. The process is implemented at temperature ca 1000°C - 1100°C in medium N₂/CH₄=0.2-5.0 and CH₄/H₂=12-20% at total pressure 120-220 torr. Derived monocrystalline diamond has the hardness in the range 50-90GPa and fracture strength 11-20MPa m^1/2.

EFFECT: increasing of diamond hardness.

7 cl, 4 dwg

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RU 2 325 323 C2

Authors

Khemli Rassell Dzh.

Mao Kho-Kvang

Jan' Chzhi-Shiju

Dates

2008-05-27—Published

2004-07-14—Filed