| 摘要 |
PURPOSE:To obtain the product excellent in high temp. strength, having high hardness and in which a deteriorating phenomenon caused by heat is reduced in a low temp. area, in a mixed ceramic of a yttria-stabilized zirconia polycrystal body with alumina, by using a raw material in which the grain size or specific surface area in both powder of zirconia and alumina is controlled to specified range. CONSTITUTION:The mixed powder of A) ZrO2 contg. 1.5 to 4.5 mole % Y2O3 (having 5 to 50m<2>/g specific surface area) and B) Al2O3 powder (having 0.5 to 20m<2>/g specific surface area) where the grain size in both components is selected so that the sintering temp. in the Al2O3 powder is made to higher than that in the ZrO2 powder by 0 to 400 deg.C is compacted and pre-sintered at 1200 to 1650 deg.C, which is then subjected to HIP treatment at 1300 to 1650 deg.C under 100 to 2000kg/cm<2> gas pressure, by which the zirconia-based ceramic for structural materials can be obtd. |
