| 摘要 |
PURPOSE:To obtain high-toughness Si3N4 type ceramics by molding metallic Si powder added with Si3N4 whiskers, then subjecting the molding to reaction nitriding and calcination. CONSTITUTION:An org. binder is added to the starting raw material prepd. by adding and mixing (B) 5-30wt.% Si3N4 whiskers and, if necessary, (C) 2-30wt.% sintering assistant such as Y2O3, MgO and spinel to and with (A) metallic silicon powder and after the mixture is thoroughly mixed, the mixture is molded and degreased. This degreased molding is subjected to the reaction nitriding for about 2hr at 1,300-1,500 deg.C in an N2 atmosphere, then to the regular calcination for about 3hr at 1,700-1,900 deg.C. |
