| 摘要 |
PURPOSE:To obtain the subject sintered material having high strength and uniform properties while suppressing the formation of abnormal texture caused by Fe, thereby reducing the breaking frequency caused by abnormal texture. CONSTITUTION:The objective material is produced by adding 0.01-2wt.% (in terms of W metal) of a W compound to a system composed mainly of silicon nitride and containing 0.5-10mol% (in terms of oxide) of a compound of Y and/or a rare-earth element and 5-2,000ppm (in terms of metallic element) of Fe as an impurity, molding the mixture and baking the produced molding at 1600-2000 deg.C in a non-oxidizing atmosphere. |
