| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicon nitride-based sintered compact excellent in strength at a temperature ranging from normal temperature to 1,000 deg.C and also excellent in static fatigue property and abrasion resistance. SOLUTION: This sintered compact comprises silicon nitride as a principal component, at least one of group 3a elements in an amount of 6.0-12.0 wt.% in terms of their oxides, aluminum in an amount of 1.0-5.0 wt.% in terms of its oxide, excess oxygen in an amount of 1.0-3.0 wt.% in terms of silicon dioxide and niobium in an amount of 0.5-7.0 wt.% in terms of its oxide. The sintered compact has a relative density of >=98% and also at least part of niobium is a carbide. |
