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Thermophysical Properties of Y2O3 and Gd2O3 Co―doped SrZrO3 Thermal Barrier Coating Material

Author(s): MA Wen, SONG Feng-Yu, DONG Hong-Ying, XU Ping, LUN Wen-Shan, ZHENG Xue-Bin

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 2;
Start page: 209;
Date: 2012;
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Keywords: thermal barrier coatings; perovskite; thermophysical properties; rare earth oxides

Y2O3 (5mol%) and Gd2O3 (5mol%) co―doped SrZrO3 (Sr(Zr0.9Y0.05Gd0.05)O2.95, SZYG) was synthesized by solid state reaction method. The phase stability of the SZYG powder synthesized at high temperature of 1450¡æ for a long period and at temperature range of 200?1400¡æ was characterized by XRD and DSC, respectively. The coefficients of thermal expansion (CTEs) of bulk SZYG recorded by a high―temperature dilatometer show that the phase transitions of SrZrO3 is suppressed remarkably by co―doping Y2O3 and Gd2O3. The thermal conductivity of bulk SZYG at 1000¡æ is 1.36 W/(m·K), which is 35% lower than that of bulk SrZrO3 and 8YSZ. The good chemical compatibility of SZYG with 8YSZ and Al2O3, is detected after heat―treatment at 1250¡æ for 24 h.
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