抄録
The Al2O3 compact with extremely fine grain size (about 0.8gm) was prepared by sintering in vacuum at 1523K and then HIP-treatment in argon at 1473K. The structure and mechanical properties of the white ceramics as above were mainly studied, comparing with those of conventional white ceramics. The results obtained, for instance, were as follows. The room temperature transverserupture strength of the fine grained ceramics reached the value of about 1.3 GPa, being in good contrast to that of about 0.7-0.9GPa of conventional one (according to JIS R 1601, 1981). It was noted that the value of creep strain of fine grained one surprisingly increased, in comparison with conventional one.
