| 摘要 |
PROBLEM TO BE SOLVED: To obtain an alumina-based sintered compact having stable strength in an oxidizing atmosphere from a room temperature to a high temperature and improved toughness and to provide a method for production thereof. SOLUTION: A molding compact comprising alumina as a main component and containing at least Fe element is heated in an oxidizing atmosphere so as to subject the Fe element to solid solution treatment in alumina crystal. The solid solution is heat-treated in a temperature range of a reducing atmosphere and a compound oxide of the formula FeAl2 O4 is precipitated in the alumina crystal particle to give the objective alumina-based sintered compact comprising alumina crystal having <=6μm average particle diameter as a main phase and >=1vol.% based on the whole amount of the compound oxide of the formula FeAl2 O4 having <=0.5μm average particle diameter in the alumina crystal particle. Another metal oxide crystal phase, in an amount of 3vol.% based on the whole amount, different from the FeAl2 O4 crystal is added to the compact to suppress the granule growth. |
