| 摘要 |
PURPOSE:To obtain the subject sintered compact having excellent strength and toughness and suitable for practical use by specifying the baking temperature and the baking time of a mixture of a rare-earth metal oxide and alumina, thereby decreasing the crystal particle diameter of the sintered product below a prescribed level. CONSTITUTION:The objective rare-earth oxide-alumina sintered compact having crystal particle diameter of <=30mum and free from the generation of defects such as void and pore and the abnormal particle growth causing the lowering of strength and toughness can be produced by forming a mixture of 5-95wt.% of rare-earth metal oxide such as Sc2O3, Y2O3 and La2O3 and 5-95wt.% of alumina, heating the mixture at a heating rate of 1-200 deg.C/min and keeping at 1500-1800 deg.C for 0.1-10hr. The sintered compact is e.g. composed mainly of Ln4Al2O9 or LnAlO3 (Ln is rare-earth element or their mixture). |
