Formation and Sintering of Yttria-Doped Tetragonal Zirconia with 50 mol% Alumina Prepared by the Hydrazine Method |
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| Authors: | Shinya Kimoto Ken Hirota Osamu Yamaguchi Hideki Kume Suguru Inamura Hiroki Miyamoto |
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| Affiliation: | Department of Applied Chemistry, Faculty of Engineering, Doshisha University, Kyoto 602, Japan;Osaka Prefectural Institute of Industrial Technology, Osaka 550, Japan |
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| Abstract: | Al2O3/Y2O3-doped ZrO2 composite powders with 50 mol% Al2O3 are prepared by the hydrazine method. As-prepared powders are mixtures of AlO(OH) gel and amorphous ZrO2 solid solutions containing Y2O3 and Al2O3. The formation process leading to α-Al2O3- t -ZrO2 composite powders is examined. Hot isostatic pressing is performed for 2 h at 1400°C under 196 MPa using θ-Al2O3- t -ZrO2 composite powders. The resulting dense, sintered α-Al2O3- t -ZrO2 composites show excellent mechanical strength. |
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