| 摘要 |
PURPOSE:To obtain transparent ceramics proof against high temp. and having superior corrosion resistance and strength by mixing Si3N4 powder with Sc2O3 powder and AlN powder as sintering aids, molding and sintering the mixture. CONSTITUTION:A mixture consisting of 2-4wt.% Sc2O3 powder and 0.2-0.5wt.% AlN powder as sintering aids and the balance Si3N4 powder is mixed with a solvent by means of a mill to prepare a slurry. This slurry is dried and the resulting powder is press-molded in a metal mold, vacuum-degassed and subjected to isostatic pressing to obtain a molded body. This molded body is sintered at 1,800-1,900 deg.C in a nonoxidizing atmosphere under the pressure of gaseous nitrogen. |
