| 摘要 |
PURPOSE:To obtain a uniform sintered compact not having difference in properties between inside and outside of the compact. CONSTITUTION:After forming a mixture consisting of a silicon nitride as a main component and containing at least 0.5-10mol% one oxide of 3a group elements of the Periodic Table into a prescribed shape, the formed body is embedded in a silicon nitride powder containing 0.1-0.5wt.% of oxygen and calcinated in an unoxidizing atmosphere containing nitrogen at 1700-2000 deg.C. |
