Microstructure and thermal cycling life of LaZrCeO thermal barrier coatings deposited by electron beam physical vapor deposition

MU Rende; LIU Guanxi; XIE Xiaochang

doi:10.11868/j.issn.1005-5053.2021.000024

Journal of Aeronautical Materials (Feb 2022)

Microstructure and thermal cycling life of LaZrCeO thermal barrier coatings deposited by electron beam physical vapor deposition

MU Rende,
LIU Guanxi,
XIE Xiaochang

Affiliations

MU Rende: 1.Key Laboratory for Advanced Corrosion and Protection of Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
LIU Guanxi: AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
XIE Xiaochang: AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China

DOI: https://doi.org/10.11868/j.issn.1005-5053.2021.000024
Journal volume & issue: Vol. 42, no. 1
pp. 33 – 39

Abstract

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Advanced thermal barrier coatings (TBCs) have attracted extensive attention in the field of advanced aero-engine. The thermal cycling life and failure behavior of advanced TBCs still remain a challenge. This work focuses on crystal structure, microstructure and failure behavior of the LaZrCeO/YSZ double ceramic layers TBCs. A composite of pyrochlore and fluorite is formed in LaZrCeO/YSZ coating. The microstructure of LaZrCeO/YSZ coating is composed of feathery nanostructure and intra-columnar pores. The LaZrCeO/YSZ DCL TBCs exhibit good thermal cycling life at 1100 °C. After thermal cycling test, the cracks initiated and propagated in TGO layer due to the stress concentration, including horizontal cracks and vertical cracks, led to the instability of the whole coating system, and finally caused the failure of TBCs.

Published in Journal of Aeronautical Materials

ISSN: 1005-5053 (Print)
Publisher: Journal of Aeronautical Materials
Country of publisher: China
LCC subjects: Technology: Motor vehicles. Aeronautics. Astronautics
Website: http://jam.biam.ac.cn/indexen.htm

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