ZrO 2 -Al 2 O 3 composite ceramic material

Details ZrO 2 -Al 2 O 3 composite ceramic material ZrO 2 -Al 2 O 3 composite ceramic material

2006-06-06

2006-06-06

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

Reexamination Certificate

active

07056851

ABSTRACT:
A ZrO2—Al2O3composite 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 ZrO2grains having an average grain size of 0.1 to 0.8 μm, and containing 10 to 12 mol % of CeO2and 0.005 mol % to less than 0.5 mol % of Y2O3, and a second phase of Al2O3grains having an average grain size of 0.1 to 0.5 μm. The ZrO2grains is composed of 90 vol % or more of tetragonal ZrO2, 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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