Achieving high anti-sintering performance of plasma-sprayed YSZ thermal barrier coatings through pore structure design

Huang, Jibo ¹Chu, Xin ¹Yang, Tin ²Fang, Huanjie ²Ye, Dongdong ³Wang, Weize ²Zhang, Xiaofeng ¹Sun, Wen ¹Huang, Renzhong ¹Li, Chang-Jiu⁴

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作者信息

1. Guangdong Acad Sci
2. East China Univ Sci & Technol
3. Anhui Polytech Univ
4. Xi An Jiao Tong Univ
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Abstract

Sintering is one of the critical factors leading to thermal and mechanical degradation of plasma-sprayed thermal barrier coatings (TBCs) in service under high temperature. The sintering resistance of the coating is expected to be improved through pore structure design. In this study, through a strategically improved powder feeding process, 8YSZ powders with fine-sized and coarse-sized pores were injected from the tail of plasma flame during plasma spraying to design porous coatings containing two differently flattened particles with different pore structures. The microstructural and property evolutions during sintering of the coatings were systematically studied compared with traditionally structured coatings. The effect of pore morphology on its sintering behavior was analyzed by quasi-in-situ observation of microstructure evolution. Results show that the anti-sintering performance of plasma-sprayed coating can be improved by adjusting the pore structure of coating with porous unmelted particles. In particular, the introduction of unmelted particles with coarse-sized pores can ensure that the coating has excellent thermal and mechanical properties for a long time. The results of this study provide guidance for structural design of anti-sintering plasma-sprayed coatings.

Key words

Thermal barrier coating/Plasma spraying/Pore structure design/Sintering/MICROSTRUCTURAL CHARACTERIZATION/MECHANICAL-PROPERTIES/FRACTURE-TOUGHNESS/ZIRCONIA COATINGS/CERAMIC COATINGS/EVOLUTION/INTERFACES/EXPOSURE/SPLAT

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出版年

2022

Surface & Coatings Technology

ISTP

ISSN：0257-8972

被引量11

参考文献量51

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