Fabrication and mechanical properties of ZrO{sub 2} solid solution and composite ceramics in the system ZrO{sub 2}(Y{sub 2}O{sub 3})-Al{sub 2}O{sub 3}
- Doshisha Univ., Kyoto (Japan)
- Osaka Prefectural Inst., Osaka (Japan); and others
In the system ZrO2-Al2O3, dense ZrO2 solid solution ceramics containing 25 mol% Al2O3 are fabricated by the HIP technique using metastable ZrO2 solid solution powders prepared from alkoxides. The ceramics with nanometer grain size show excellent high fracture toughness of {approx}23 MPa{center_dot}m1/2, although they exhibit weak bending strength of {approx}600 MPa. To improve the strength, metastable ZrO2 solid solutions containing 25 mol% Al2O3 and (0.75-3.75) mol% Y2O3 are hot isostatically pressed at 1130{degrees}C and 1230{degrees}C. Two kinds of materials are fabricated: (1) ZrO2 solid solution ceramics and (2) composite ceramics of ZrO2 solid solution and {alpha}-Al2O3. Their mechanical properties are examined in connection with the microstructures and t/m ZrO2 ratios.
- OSTI ID:
- 175589
- Report Number(s):
- CONF-9501103--
- Country of Publication:
- United States
- Language:
- English
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