Effects of gradient transitional layer on thermal cycling life and failure of LaZrCeO/YSZ thermal barrier coatings

•The LaZrCeO/YSZ with GTL showed relativity good thermal cycling life and thermal stability.•After thermal cycles, the Cr element diffuses out and concentrates in LaZrCeO layer.•The crack evolution and diffusion behavior appear to be relevant with the failure mechanism. The present work focuses on i...

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Bibliographic Details
Published in:Corrosion science 2020-02, Vol.163, p.108224, Article 108224
Main Authors: Shen, Zaoyu, He, Limin, Mu, Rende, Xu, Zhenhua, Huang, Guanghong
Format: Article
Language:English
Subjects:
A. Ceramic
B. Thermal cycling
C. Interfaces
C. Oxidation
Coatings
Diffusion layers
Electron microscopes
Electron microscopy
Evolution
Failure mechanisms
Microscopy
Thermal barrier coatings
Thermal cycling
Thermal stability
Thermodynamic properties
Yttria-stabilized zirconia
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Summary:•The LaZrCeO/YSZ with GTL showed relativity good thermal cycling life and thermal stability.•After thermal cycles, the Cr element diffuses out and concentrates in LaZrCeO layer.•The crack evolution and diffusion behavior appear to be relevant with the failure mechanism. The present work focuses on investigation of the effects of gradient transitional layer (GTL) on thermal cycling life and failure behavior of LaZrCeO/YSZ thermal barrier coatings. Characterization of microstructure evolution is implemented using correlative methods, which links together the observations and analysis from X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The LaZrCeO/YSZ with GTL showed relatively good thermal cycling life and thermal stability. After thermal cycles, Cr element diffuses out and concentrates in LaZrCeO layer. The crack evolution, diffusion behavior and thermal stability are the key factors for the good thermal cycling life and failure mechanism of LaZrCeO/YSZ.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108224