| 摘要 |
PURPOSE:To synthesize a cubic boron nitride crystal, in an extremely high conversion, by reacting a mixture of boron nitride and a catalyst composed of a metal or metallic compound under specific condition, and removing the catayst from the reaction product. CONSTITUTION:50-95mol% boron nitride obtained by the thermal decomposition of borazine and/or a borazine derivtive is mixed with 5-50mol% catalyst composed of a metal and/or a metallic compound, e.g. aluminum nitride. The mixture is made to react under >=3GPa pressure at >=70 deg.C, and the catalyst is removed from the reaction product to obtain the objective cubic boron nitride crystal.
|
