热障涂层用(Sm0.5Yb0.5)3TaO7陶瓷的热物理性能

摘要/Abstract

摘要： 为开发性能优异的新型热障涂层表面陶瓷层材料,探索Yb掺杂对Sm₃TaO₇热物理性能的影响,采用高温固相反应法,成功制备了(Sm_0.5Yb_0.5)₃TaO₇陶瓷,并对其晶体结构、微观结构、元素含量、热物理和高温相稳定性能进行了研究。结果表明,制备的(Sm_0.5Yb_0.5)₃TaO₇陶瓷具有单一焦绿石结构,致密的显微组织,制备过程中无元素损失现象发生。元素掺杂增加了声子散射程度,(Sm_0.5Yb_0.5)₃TaO₇热导率明显降低,其高温热导率仅为1.02 W/(m·K),远低于Sm₃TaO₇和Yb₃TaO₇的1.31 W/(m·K)和1.14 W/(m·K)。由于掺杂离子Yb³⁺较低的电负性,其在1 300 ℃时的热膨胀系数为9.92×10^-6 K^-1,热膨胀系数明显高于Sm₃TaO₇,与YSZ和La₂Zr₂O₇的热膨胀系数在同一数量级。其热导率和热膨胀系数满足热障涂层的要求,在室温至1 300 ℃表现出良好的高温相稳定性能。

关键词: 稀土钽酸盐, 声子散射, 热物理性能, 热障涂层, 热导率

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

中图分类号:

TQ174.1

郭怡, 牛苗苗. 热障涂层用(Sm_0.5Yb_0.5)₃TaO₇陶瓷的热物理性能[J]. 人工晶体学报, 2024, 53(12): 2066-2072.

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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热障涂层用(Sm_0.5Yb_0.5)₃TaO₇陶瓷的热物理性能

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

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