大气等离子喷涂ZrO2–YO1.5–TaO2.5热障涂层的非平衡晶界钽偏析失效机理

姚尧; 毋敌; 赵晓峰; 杨帆

doi:10.1007/s12613-021-2394-z

Volume 29 Issue 12

Dec. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(12): 2189-2200

Yao Yao, Di Wu, Xiaofeng Zhao, and Fan Yang, Premature failure induced by non-equilibrium grain-boundary tantalum segregation in air-plasma sprayed ZrO₂–YO_1.5–TaO_2.5 thermal barrier coatings, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2189-2200. https://doi.org/10.1007/s12613-021-2394-z

Cite this article as:

Yao Yao, Di Wu, Xiaofeng Zhao, and Fan Yang, Premature failure induced by non-equilibrium grain-boundary tantalum segregation in air-plasma sprayed ZrO2–YO1.5–TaO2.5 thermal barrier coatings, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2189-2200. https://doi.org/10.1007/s12613-021-2394-z

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研究论文

大气等离子喷涂ZrO₂–YO_1.5–TaO_2.5热障涂层的非平衡晶界钽偏析失效机理

1)
上海交通大学上海市先进高温材料及其精密成形重点实验室, 上海 200240, 中国
2)
上海交通大学机械与动力工程学院, 上海 200240, 中国

通讯作者:
赵晓峰 E-mail: xiaofengzhao@sjtu.edu.cn

杨帆 E-mail: fanyang_0123@sjtu.edu.cn

中文摘要

ZrO₂–YO_1.5–TaO_2.5(ZYTO)三元体系因其低的热导率、稳定的四方相结构和铁弹性增韧机制，成为了热障涂层陶瓷层候补材料中的研究热点。然而，目前ZYTO材料的研究主要集中在块体结构及性能方面，对于其作为热障涂层实际应用的结构及性能却鲜有报道。本文旨在系统地研究ZYTO热障涂层在高温服役过程中的结构及性能演变，并明确其高温失效机理。本文通过大气等离子喷涂方法制备了ZYTO热障涂层，并研究了其在1150°C下的热循环性能及微观结构演变。研究结果表明，尽管ZYTO块体材料具有良好的热学和力学性能，但是大气等离子喷涂ZYTO热障涂层却表现出极短的热循环寿命。这主要归因于在超高温的大气等离子喷涂过程中Ta元素有限的溶解度以及急速冷却所伴随的非平衡晶界Ta偏析现象，导致 ZYTO热障涂层发生了从稳定四方相到亚稳四方相和立方相的相变过程。相变过程带来了~0.74vol%的体积收缩，使得涂层中亚稳四方相和立方相的相界处萌生了大量微裂纹。此外，具有大量晶界Ta偏析的立方相表现出明显的晶间脆化，显著降低了涂层的结合强度(~5.3 MPa)，使得大气等离子喷涂ZYTO热障涂层过早失效。

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Research Article

Premature failure induced by non-equilibrium grain-boundary tantalum segregation in air-plasma sprayed ZrO₂–YO_1.5–TaO_2.5 thermal barrier coatings

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Abstract

Abstract

ZrO₂–YO_1.5–TaO_2.5 (ZYTO) is a promising top-coat material for thermal barrier coatings (TBCs). The bulk properties of ZYTO have been reported by several studies, but its performances as TBCs are less-well understood. In this work, ZYTO TBCs were prepared by air plasma spraying (APS) and their thermal cycling performances were investigated at 1150°C. Despite of the good bulk properties, APS ZYTO TBCs present an extremely short thermal fatigue life. This is attributed to the non-equilibrium grain-boundary segregation of TaO_2.5 induced by limited solubility and rapid quenching during APS process, resulting in a tetragonal (t) to cubic (c) and metastable-tetragonal (t_m) phase transformation in ZYTO TBCs. The volume shrinkage (~0.74vol%) of phase transformation leads to many cracks at the c/t_m phase boundaries after deposition. On the other hand, the formation of cubic phase with massive grain-boundary Ta segregation induces a large intergranular embrittlement and a weak bonding strength (~5.3 MPa), resulting in the premature failure of the ZYTO TBCs.
- thermal barrier coatings;
- air plasma spray;
- tantalum segregation;
- phase transformation

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大气等离子喷涂ZrO₂–YO_1.5–TaO_2.5热障涂层的非平衡晶界钽偏析失效机理

中文摘要

Premature failure induced by non-equilibrium grain-boundary tantalum segregation in air-plasma sprayed ZrO₂–YO_1.5–TaO_2.5 thermal barrier coatings

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