| 摘要 |
Zirconia ceramics consisting mainly of ZrO2 and Y2O3 in a molar ratio of Y2O3/ZrO2 of 2/98~7/93 and consisting of crystal grains having a mixed phase consisting essentially of tetragonal phase and cubic phase or having a phase consisting essentially of tetragonal phase, the average size of the crystal grains being not larger than 2 .mu.m, has a high strength and is little in the deterioration of the strength due to the lapse of time, and is suitable as a solid electrolyte for oxygen concentration cell, machine parts for internal combustion engine, thermistor, cutting tool and other industrial materials. |
