| 摘要 |
A ZrO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3 </SUB>composite ceramic material is provided, which is excellent in mechanical strength and toughness, and has the capability of preventing low temperature degradation. This ceramic material includes a first phase of ZrO<SUB>2 </SUB>grains having an average grain size of 0.1 to 0.8 mum, and containing 10 to 12 mol % of CeO<SUB>2 </SUB>and 0.005 mol % to less than 0.5 mol % of Y<SUB>2</SUB>O<SUB>3</SUB>, and a second phase of Al<SUB>2</SUB>O<SUB>3 </SUB>grains having an average grain size of 0.1 to 0.5 mum. The ZrO<SUB>2 </SUB>grains is composed of 90 vol % or more of tetragonal ZrO<SUB>2</SUB>, and a content of the second phase in the composite ceramic material is in a range of 20 to 60 vol %, and preferably 30 to 50 vol %.
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