Investigation of Thermal Shock Behavior of Nanostructured (Gd0.9Yb0.1)2Zr2O7/ YSZ Thermal Barrier Coatings

被引：0

作者：

Fan W. ^{[1
]}

Bai Y. ^{[2
]}

Wang Y. ^{[2
]}

机构：

[1] School of Energy and Power Engineering, North University of China, Taiyuan

[2] State Key Laboratory for Mechanical Behavior of Materials, Xi’ an Jiaotong University, Xi’an

来源：

Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2023年 / 41卷 / 04期

关键词：

failure analysis; nanostructure; quasi-gradient coating; rare earths; thermal barrier coatings; thermal shock behavior;

D O I：

10.11785/S1000-4343.20230412

中图分类号：

学科分类号：

摘要：

The high thrust-to-weight ratio and high efficiency of aero-engines require developing new thermal barrier coatings materials and structures. Thermal barrier coatings with （Gd0.9Yb0.1）2Zr2O7/YSZ double-ceramic layer structure and quasi-gradient structure were prepared by synchronous dual powder feeding system. Their thermal shock properties and failure mechanism were analyzed at 1350-1400 ℃ . The results show that （Gd0.9Yb0.1）2Zr2O7 （GYbZ） thermal barrier coatings exhibit high phase stability at elevated temperature. The phase compositions of both the as-sprayed coatings and the failedones remain single fluorite structure. The GYbZ/ YSZ thermal barrier coating presents a bimodal structure consisting of nano-sized unmelted particles and molten crystallization zone. The thermal shock life of GYbZ/YSZ double-layered structure is about 113 times，and that of GYbZ/YSZ quasi-gradient structure reaches 370 times. The spalling of the double-layered coating mainly occurs inside of GYbZ and/or at the interlayer between GYbZ and YSZ，while the spalling of the quasi-gradient coating occurs in the YSZ layer near the thermally grown oxides （TGOs）. The combination of quasi-gradient structure and nano bimodal structure is an effective way to improve the thermal shock life of thermal barrier coatings. © 2023 Chinese Society of Rare Earths. All rights reserved.

引用

页码：757 / 764

页数：7

共 21 条

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