| 摘要 |
PROBLEM TO BE SOLVED: To obtain a good sintered compact of silicon nitride having higher strength and excellent abrasion resistance and oxidation resistance, and scarcely having heterogeneous phase. SOLUTION: This sintered compact of silicon nitride has a composition of 80-97 wt.% silicon nitride, 1-10 wt.% Ce expressed in terms of CeO, 0.5-5 wt.% Mg expressed in terms of MgO, 0.5-5 wt.% Sr expressed in terms of SrO and 5.5-6.9 Si expressed in terms of SiO2 , and the weight ratio of SiO2 /MgO regulated so as to be within a range of 1.4-1.7. |
