| 摘要 |
PURPOSE:To obtain the subject sintered compact consisting of smalldiameter grains and having high density and mechanical strength by compacting a mixture of SiC powder, a B-contg. compd., and a C-contg. compd., impregnating the compact with a soln. of an org. Al compd., and sintering the impregnated compact in a nonoxidizing atmosphere. CONSTITUTION:From 99.92-97.5wt.% SiC powder consisting essentially of beta-SiC having 0.03-0.3mu grain diameter, 0.02-0.1wt.% B-contg. compd. (e.g., B) corresponding to B atom, and 0.03-0.15wt.% C-contg. compd. (e.g., carbon black) corresponding to C atom are mixed. The mixture is compacted into a specified shape, and the compact is impregnated with the soln. of an org. Al compd. (e.g., aluminum alkoxide) in a solvent (e.g., benzene) so that the total amt. of the Al, B, and C atoms is controlled to 0.08-0.35wt.%. The impregnated compact is then sintered in a nonoxidizing atmosphere. |
