| 摘要 |
PURPOSE:To obtain a silicon nitride sintered compact improved in mechanical strength characteristics at elevated temperatures of as high as >=1200 deg.C, esp. creep-resistant characteristics and instantaneous fracture-resistant characteristics. CONSTITUTION:This sintered compact consists mainly of (A) silicon nitride and (B) at least one kind of sintering auxiliary selected from yttrium oxide, ytterbium oxide, hafnium oxide, scandium oxide and lanthanum oxide, with the aluminum content thereof being <=500ppm. |
