| 摘要 |
PURPOSE:To produce a sintered material of boron nitride free from crack, broken piece, etc., by direct conversion method not using a catalyst. CONSTITUTION:Before a molded article of low-pressure phase boron nitride of raw material is treated under statically extra-high pressure and high temperature, the molded article of raw material is covered with carbon. A sintered material of cBN free from crack, broken piece, etc., can be produced by direct conversion method not using a catalyst. |
