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Research Article | Open Access

Investigation of microstructure changes in Al2O3-YSZ coatings and YSZ coatings and their effect on thermal cycle life

Meiqi DAIa,bXuemei SONGaChucheng LINaZiwei LIUaWei ZHENGaYi ZENGa,b( )
The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

Yttria-stabilized zirconia (YSZ) coatings and Al2O3-YSZ coatings were prepared by atmospheric plasma spraying (APS). Their microstructural changes during thermal cycling were investigated via scanning electron microscopy (SEM) equipped with electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). It was found that the microstructure and microstructure changes of the two coatings were different, including crystallinity, grain orientation, phase, and phase transition. These differences are closely related to the thermal cycle life of the coatings. There is a relationship between crystallinity and crack size. Changes in grain orientation are related to microscopic strain and cracks. Phase transition is the direct cause of coating failure. In this study, the relationship between the changes in the coating microstructure and the thermal cycle life is discussed in detail. The failure mechanism of the coating was comprehensively analyzed from a microscopic perspective.

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Journal of Advanced Ceramics
Pages 345-353
Cite this article:
DAI M, SONG X, LIN C, et al. Investigation of microstructure changes in Al2O3-YSZ coatings and YSZ coatings and their effect on thermal cycle life. Journal of Advanced Ceramics, 2022, 11(2): 345-353. https://doi.org/10.1007/s40145-021-0538-2

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Received: 08 May 2021
Revised: 03 September 2021
Accepted: 20 September 2021
Published: 11 January 2022
© The Author(s) 2021.

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