| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that a conventional silicon nitride sintered compact shows a rapid loss of strength due to softening of the glass component present in the grain boundary when used in a high temperature environment of ≥1,000°C and improve its high-temperature strength, creep resistance, and oxidation resistance. <P>SOLUTION: The silicon nitride sintered compact is manufactured to have the grain boundary phase comprising Si, Hf, O, N, and rare-earth elements (atomic number 21, 39, 57-71) and containing Hf of 0.5-5 wt.% and rare-earth elements of 0.1-6 wt.%. <P>COPYRIGHT: (C)2004,JPO |
