| 摘要 |
PURPOSE:To obtain a highly reliable sintered compact having high strength and toughness by baking a mixture of powder of rareearth metal oxide-alumina- silica, SiC and Si3N4). CONSTITUTION:The objective silicon carbide-silicon nitride-mixed oxide sintered compact free from void, pore, etc., can be produced by mixing 5-95wt.% of a mixed oxide consisting of 95-5wt.% of rare-earth metal oxide, 4.9-94.9wt.% of alumina and 0.1-10wt.% of silica and 95-5wt.% of a non-oxide mixture consisting of 90-5wt.% of SiC powder, whisker or their mixture and 10-95wt.% of Si3N4 powder, whisker or their mixture, forming the obtained mixture, heating the formed product in a non-oxidizing atmosphere at a heating rate of 5-2000 deg.C/min and maintaining at 1500-1900 deg.C for 0.1-600 min. The above mixed oxide is e.g. composed of 99.9-90wt.% of Ln4AlO9 or LnAlO3 (Ln is rare-earth elements or their mixture) and 0.1-10wt.% of silica. |
