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US 4,767,608 AGranted
Method for synthesizing diamond by using plasma
AssigneeNational Institute for Research in Inorganic Materials
InventorsSeiichiro Matsumoto, Mototsugu Hino, Yusuke Moriyoshi, Takashi Nagashima, Masayuki Tsutsumi
Life of this patent
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Abstract
A method for synthesizing diamond, which comprises: (a) generating a plasma by electric discharge in a gas selected from the group consisting of a hydrocarbon gas, hydrogen gas, an inert gas and a mixture thereof, (b) decomposing a carbon source by the plasma to form plasma gas containing carbon ions or carbon radicals, (c) effecting adiabatic expansion of the plasma gas to precipitate diamond.
Claims14
A method for synthesizing diamond, which comprises:
- (a) generating a plasma by electric discharge in a gas selected from the group consisting of a hydrocarbon gas, a hydrogen gas, an inert gas and a mixture thereof,
- (b) decomposing a carbon source by the plasma to form a plasma gas containing carbon ions or carbon radicals, and
- (c) effecting adiabatic expansion of the plasma gas to precipitate diamond.
Dependencies are inferred from the claim text.