Polycrystalline diamond and method of manufacturing the same

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United States of America Patent

PATENT NO 8784767
APP PUB NO 20120258035A1
SERIAL NO

13517921

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Abstract

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Polycrystalline diamond includes cubic diamond and hexagonal diamond, and a ratio of X-ray diffraction peak intensity of a (100) plane of the hexagonal diamond to X-ray diffraction peak intensity for a (111) plane of cubic diamond is not lower than 0.01%. In addition, a present method of manufacturing polycrystalline diamond includes the steps of preparing a non-diamond carbon material having a degree of graphitization not higher than 0.58 and directly converting the non-diamond carbon material to cubic diamond and hexagonal diamond and sintering the non-diamond carbon material, without adding any of a sintering agent and a binder, under pressure and temperature conditions at which diamond is thermodynamically stable.

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Patent Owner(s)

Patent OwnerAddress
SUMITOMO ELECTRIC INDUSTRIES LTD5-33 KITAHAMA 4-CHOME CHUO-KU OSAKA-SHI OSAKA 541-0041

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Arimoto, Keiko Itami, JP 12 40
Sato, Takeshi Itami, JP 434 4801
Sumiya, Hitoshi Itami, JP 92 583
Yamamoto, Katsuko Itami, JP 30 122

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