Abstract
RE2CrTaO7 (Y, Sm, Dy, Yb) thermal barrier coating material was obtained by sintering high-purity RE2O3 (Y, Sm, Dy, Yb), Cr2O3, and Ta2O5 powder at 1600 °C. Phase-structure, microstructure, and thermal-physical properties of the material were investigated. Results show that RE2CrTaO7 (Y, Dy, Yb) thermal barrier coating with single fluorite crystal-structure and Sm2CrTaO7 with single pyrochlore-type crystal-structure were successfully synthesized. Thermal conductivity of the material at 1000 °C falls within 1.005 W/m·K-0.868 W/m·K, and the coefficient of thermal expansion is 9.3 × 10−6 K−1-10.8 × 10−6 K−1. Although thermal expansion performance of this material is equivalent to that of common YSZ materials, thermal conductivity is much lower than that of YSZ material, which proves that RE2CrTaO7 (Y, Sm, Dy, Yb) is potential thermal barrier coating material.
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