| 摘要 |
PURPOSE:To obtain the titled sintered compact having excellent folding endurance (at ordinary and high temperature), fracture toughness and oxidation resistance, etc., by sintering and molding a blend composition of a specific SiC whisker with a specific Si3N4 in the presence of oxide of rare earth elements. CONSTITUTION:5-40wt.% SiC whisker having 5-30mu average length, 0.2-5mu average diameter, 2-150 aspect ratio, <=1.0wt.% content of cation impurity (e.g. Al) and SiO2 and 95-60wt.% Si3N4 powder having >=90% alpha ratio are pulverized and blended in the presence of 5-30wt.% one or more oxide (e.g. Y2O3) of rare earth elements used as a sintering auxiliary until the above- mentioned SiC whisker is uniformly dispersed in the range of 5-30mu average length and then molded and sintered under reduction atmosphere or inert gas non-oxidative atmosphere at 1,650-1,850 deg.C until ratio of Si3N4 becomes <=40wt.% to provide the titled sintered compact. |
