Preparation and thermophysical properties of RE2CrTaO7 (Y, Sm, Dy, Yb) ceramics for thermal barrier coating applications

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 degrees 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 degrees C falls within 1.005 W/m center dot K-0.868 W/m center dot K, and the coefficient of thermal expansion is 9.3 x 10-6 K-1-10.8 x 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.

Automated summary

RE2CrTaO7 (Y, Sm, Dy, Yb) thermal barrier coating material with desirable thermal expansion performance and low thermal conductivity was successfully synthesized by sintering high-purity powders. This material has the potential to be an excellent thermal barrier coating material.