Influence of Gd2O3 and Yb2O3 Co-doping on Phase Stability,Thermo-physical Properties and Sintering of 8YSZ |
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Authors: | ZHANG Yanli a GUO Lei a YANG Yongping b GUO Hongbo a ZHANG Hongju a GONG Shengkai a a |
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Institution: | School of Materials Science and Engineering, Beihang University, Beijing 100191, China b Guizhou Liyang Aviation Power Co., Ltd., Anshun 561102, China |
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Abstract: | The role of multicomponent rare earth oxides in phase stability, thermo-physical properties and sintering for ZrO2-based thermal barrier coatings (TBCs) materials is investigated. 8YSZ co-doped with 3 mol% Gd2O3 and 3 mol% Yb2O3 (GYb-YSZ) powders are synthesized by solid state reaction for 24 h at various temperatures. As temperature increases, stabilizers are dissolved into zirconia matrix gradually. Synthesized at 1 500 °C, GYb-YSZ is basically composed of cubic phase. GYb-YSZ exhibits excellent phase stability and sinters lower than 8YSZ by nearly three times. The thermal conductivity of GYb-YSZ is much lower than that of 8YSZ, and the thermal expansion coefficient of GYb-YSZ is comparable to that of 8YSZ. The influence of Gd2O3 and Yb2O3 co-doping on phase stability, thermal conductivity and sintering of 8YSZ is discussed. |
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Keywords: | thermal barrier coatings (TBCs) Gd2O3 and Yb2O3 co-doped 8YSZ (GYb-YSZ) phase stability sintering ther-mo-physical properties |
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