| 摘要 |
PURPOSE:To obtain the titled ceramics material which has high strength and high reliability and is inexpensive by molding, degreasing and sintering a compsn. composed of Si3N4 powder, aluminum chelate compd., yttrium chelate compd., and specific org. material. CONSTITUTION:The compsn. is obtd. by mixing 40-70vol.% Si3N4 powder having <=1mum average grain size and >=10m<2>/g BET specific surface area, 0.5-10wt.% (in terms of metal) aluminum chelate compd. (e.g.: acetoalkoxy aluminum diisopropyrate), 0.5-10wt.% (in terms of metal) yttrium chelate compd. (e.g.: acetoyttrium diisopropyrate), and 10-30vol.% org. matter selected from resins and wax. This compsn. is then molded and after the molding is degreased by heating at <=800 deg.C in the atmosphere, the molding is sintered at 1,600-2,000 deg.C in a nonoxidative atmosphere. |
