| 摘要 |
PURPOSE: To Provide an alumina-based sintered compact having excellent resistance to oxidation at a high temperature, fracture toughness and high temperature strength, and its producing method. CONSTITUTION: This alumina-based sintered compact contains a perovskite- type dispersed phase having a mean crystal particle diameter of <=3μm in an amount of >=0.5vol.% to whole amount dispersing in alumina crystal granules. Preferably, the perovskite-type dispersed phase contains at least one kind of Nd, Sm, Eu and Gd. The alumina-based sintered compact is obtained by adding a solution containing a metal element constructing a perovskite-type dispersed phase to an alumina raw material, blending, drying the resultant mixture to make raw material powder or calcining the mixture to make raw material powder, molding the raw material powder and baking. |
