Showa Denko K.k.

Other

Showa Denko Kabushiki Kaisha

Yoichi Hirose

Kunio Komaki

Masaaki Yanagisawa

Takashi Fujimaki

Isamu Yamamoto

Nobuyuki Nagato

Naoki Oyanagi

Shigehiro Nishino

A silicon carbide single crystal is produced by allowing a vapor evaporated from a silicon raw material to pass through a heated carbon member and then reach a seed crystal substrate on which a silicon carbide single crystal grows. For this production, an apparatus is used, which has a reaction tube, a heating device and a graphite crucible, wherein the lower part of the crucible constitutes a silicon raw material-charging part; a seed crystal substrate is situated at the top of the crucible; and a carbon member, through which the vapor evaporated from a silicon raw material in capable of passing, is disposed intermediately between the silicon raw material-charging part and the seed crystal. As the carbon member, a porous carbon structure, a carbon plate having a plurality of through holes and a carbon particle-packed layer can be mentioned.

Method and apparatus for producing silicon carbide single crystal

Apparatus for vapor-phase synthesis of diamond and method for

A composite diamond grain which comprises a heat-resistant grain as a nucleus and discrete diamond crystal particles distributed on the surface of the grain or diamond crystal films formed to cover the entire surface of the grain and a method for producing the composite diamond grain by the vapor-phase process are disclosed. For the filament method which is one form of the vapor-phase method, tantalum is useful as the material for the filament. Since tantalum is susceptible of embrittlement by hydrogen, a treatment to be performed on tantalum for the elimination of this drawback is also disclosed.

Composite diamond grain and method for production thereof

Method for vapor phase synthesis of diamond on electrochemically treated

Composite diamond granules

Composite diamond grain

A method for vapor-phase synthesis of diamond comprises burning a raw material compound for synthesis of diamond thereby forming a combustion flame, disposing a substrate for deposition of diamond in said combustion flame, and keeping said substrate at a prescribed temperature, thereby inducing deposition of diamond on said substrate.

Vapor-phase method for synthesis of diamond

Growing community of inventors

Tokyo, Japan

Kunio Komaki