Phase stability of (Y,NB)-TZP/Al₂O₃ composites under low temperature hydrothermal conditions

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• 作者：Lee ; Deuk Yong ; Kim ; Dae-Joon ; Jang ; Joo-Wung ; Choi ; Dae-Weon ; Lee ; Seung-Jae
• 关键词：Tetragonal zirconia polycrystals ; Y₂O₃ and Nb₂O₅ co-doped zirconia/Al₂O₃ composite ; Hydrothermal stability ; Mechanical properties
• 刊名：Materials Letters
• 出版年：1999
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：May, 1999
• 卷：39
• 期：4
• 页码：221-226
• 文件大小：533 K

摘要

Y₂O₃ and Nb₂O₅ co-doped tetragonal zirconia polycrystals (TZP) containing 10 to 30 vol.%Al₂O₃ ((Y,Nb)-TZP/Al₂O₃) were sintered for 5 h at 1550°C in air and hydrothermal stability of the composites was evaluated after aging for 5 h at 180°C in 0.3 MPa H₂O vapor pressure. (Y,Nb)-TZP/Al₂O₃ composites showed superior phase stability under the hydrothermal condition as compared with 3Y-TZP/Al₂O₃ composites due to the effects of Y–Nb ordering in t-ZrO₂ and the Al₂O₃ addition. The optimized strength and fracture toughness were 670 MPa and 7.3 MPa m^1/2, respectively, when 20 vol.%of 2.8 μm Al₂O₃ particles were added.