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

doi:10.3724/SP.J.1077.2012.00209

Abstract

Abstract:

Y₂O₃ (5mol%) and Gd₂O₃ (5mol%) co-doped SrZrO₃ (Sr(Zr_0.9Y_0.05Gd_0.05)O_2.95, SZYG) was synthesized by solid state reaction method. The phase stability of the SZYG powder synthesized at high temperature of 1450℃ for a long period and at temperature range of 200-1400℃ 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℃ 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℃ for 24 h.

Key words: thermal barrier coatings, perovskite, thermophysical properties, rare earth oxides

CLC Number:

TG174

MA Wen, SONG Feng-Yu, DONG Hong-Ying, XU Ping, LUN Wen-Shan, ZHENG Xue-Bin. Thermophysical Properties of Y₂O₃ and Gd₂O₃ Co-doped SrZrO₃ Thermal Barrier Coating Material[J]. Journal of Inorganic Materials, 2012, 27(2): 209-213.

Figures/Tables 6

Fig. 1 XRD patterns of SZYG powder sintered at 1450℃ for different times

Fig. 2 DSC curves of as-synthesized SZYG and SrZrO3 powders

Fig. 3 Coefficients of thermal expansion of bulk SZYG, Sr(Zr0.8Gd0.2)O2.9 and SrZrO3

Fig. 4 Thermal diffusivities of bulk SZYG, Sr(Zr0.8Gd0.2)O2.9 and SrZrO3

Fig. 5 Thermal conductivities of bulk SZYG, Sr(Zr0.8Gd0.2)O2.9 and SrZrO3

Fig. 6 XRD patterns of SZYG+8YSZ (a) and SZYG+Al2O3 (b) mixtures after heat-treated at 1250℃ for 24 h

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

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