Thermophysical Properties of (Sm0.5Yb0.5)3TaO7 Ceramics for Thermal Barrier Coating Applications

Abstract

Abstract: In this paper, (Sm_0.5Yb_0.5)₃TaO₇ was prepared via solid-reaction method in order to develop a novel ceramic layer material with excellent performance for thermal barrier coating and explore the influence of Yb addition on thermophysical performances of Sm₃TaO₇. Its crystal structure, microstructure, element composition, thermophysical performances and phase-stability at high temperatures were investigated. The final results indicate that the synthesized (Sm_0.5Yb_0.5)₃TaO₇ is of single pyrochlore-type lattice-structure, and compact microstructure, no element loss is found in the synthesis procedure. Owing to phonon scattering caused by doping cations, the thermal conductivity of (Sm_0.5Yb_0.5)₃TaO₇ reduces. Its thermal conductivity at high-temperature is about 1.02 W/(m· K), which is less than that of Sm₃TaO₇ (1.31 W/(m·K)) and Yb₃TaO₇ (1.14 W/(m·K)). Because of low electronegativity of Yb³⁺, its thermal expansion coefficient at 1 300 ℃ is about 9.92×10^-6 K^-1. Its thermal expansion coefficient is higher than that of Sm₃TaO₇ and lies in the same order with that of YSZ and La₂Zr₂O₇. The thermal conductivity and expansion coefficient of synthesized (Sm_0.5Yb_0.5)₃TaO₇ meet the requirements for thermal barrier coatings. This oxide also shows excellent phase-stability up to 1 300 ℃.

Key words: rare-earth tantalate, phonon scattering, thermophysical property, thermal barrier coating, thermal conductivity

CLC Number:

TQ174.1

GUO Yi, NIU Miaomiao. Thermophysical Properties of (Sm_0.5Yb_0.5)₃TaO₇ Ceramics for Thermal Barrier Coating Applications[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(12): 2066-2072.

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Thermophysical Properties of (Sm_0.5Yb_0.5)₃TaO₇ Ceramics for Thermal Barrier Coating Applications

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