National Institute for Researches in Inorganic Materials

National Institute for Research in Inorganic Materials

Nobuo Setaka

Seiichiro Matsumoto

Tadao Sato

Yusuke Moriyoshi

Takamasa Ishigaki

Shojiro Komatsu

Toshihiko Ishii

Mutsukazu Kamo

Yoichiro Sato

Masatsugu Futaki

A method for preparing diamond or diamond-like carbon, which comprises exciting carbon by decomposing, evaporating and dissociating an organic compound or a carbon material in a combustion flame of at least 600.degree. C. of a hydrocarbon, hydrogen or a mixture thereof and oxygen gas or air, mixing thereto hydrogen in an amount of at least one time by volume the amount of carbon, and maintaining the mixture at a temperature of from 600.degree. to 1,700.degree. C. to precipitate diamond or diamond-like carbon.

Method for preparing diamond or diamond-like carbon by combustion flame

Cubic system boron nitride from rhombohedral system boron nitride is produced by a shock wave compression method. The process comprises applying a thermodynamically stable pressure to rhombohedral system boron nitride to convert it to cubic system boron nitride.

Process for producing cubic system boron nitride

A method for synthesizing diamond wherein hydrogen gas which has passed through a micro-wave non-electrode discharge and mixed with hydrocarbon gas, or a mixture gas consisting of hydrocarbon and hydrogen after its passing through a micro-wave non-electrode discharge, is introduced onto the surface of a substrate heated to a temperature of from 300.degree. to 1300.degree. C. to decompose hydrocarbon in its energetically activated state for the diamond deposition.

Method for synthesizing diamond

A diamond powder is produced by a shock compressing method using a carbon precursor obtained by an organic compound such as furan resin, its derivative, a thermosettable resin, as a carbon source.

Process for producing diamond powder by shock compression

Growing community of inventors

Nagareyama, Japan

Nobuo Setaka