| 摘要 |
PURPOSE:To produce diamond crystals having uniform grain size, by disposing minute particles of a nucleating substance sporadically in a system for the synthesis of diamond under high temperature and pressure. CONSTITUTION:Diamond is synthesized under high temperature and pressure using a non-diamond carbon and a solvent metal such as Fe, Co, Ni, Cr, Ta, etc. In the above process, minute particles of a substance capable of easily forming diamond crystal nucleus, e.g. a metal or its alloy having lower melting point than the solvent metal, are arranged in the synthesis system keeping the particles from mutual contact in plane or in three-dimensional manner interposing nearly equal distance between the particles. The control of the synthetic condition of diamond can be facilitated by the process, and the generation of new nucleus in the unwanted region can be suppressed even if the condition of temperature and pressure is deviated to an extent from the otherwise rigorously restricted condition. Accordingly, a high-quality diamond can be synthesized in a practical rate of growth. |
