Study on the effect of CMAS and NaCl melting sequence on the corrosion resistance of thermal barrier coatings

Yang feng; Yong Shang; Chun Li; Xiao Zhang; Yanling Pei; Shengkai  Gong; Huibin Xu

doi:10.1007/s12613-024-3017-2

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International Journal of Minerals, Metallurgy and Materials > 2024 > Accepted Manuscript > DOI: 10.1007/s12613-024-3017-2

Yang feng, Yong Shang, Chun Li, Xiao Zhang, Yanling Pei, Shengkai Gong , and Huibin Xu, Study on the effect of CMAS and NaCl melting sequence on the corrosion resistance of thermal barrier coatings, Int. J. Miner. Metall. Mater.,(2024). https://dx.doi.org/10.1007/s12613-024-3017-2

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Research Article

Study on the effect of CMAS and NaCl melting sequence on the corrosion resistance of thermal barrier coatings

Yang feng^1,2),
Yong Shang^1,2),
Chun Li³⁾,
Xiao Zhang¹⁾,
Yanling Pei¹⁾,
Shengkai Gong ^1,2) and
Huibin Xu^1,2)

Author Affilications

1)
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2)
Tianmushan Laboratory, Hangzhou 311115, China
3)
Aerospace Research Institute of Materials & Processing Technology, Beijing 100080, China

Received: 29 May 2024; Revised: 19 August 2024; Accepted: 23 September 2024; Available Online: 24 September 2024

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Abstract

Abstract

Calcium-magnesium-alumina-silicate (CMAS) and/or molten salt corrosion has attracted increased attentions, which is an important cause of thermal barrier coatings (TBCs) failure. In this study, the effect of CMAS and NaCl melting sequence on the corrosion mechanisms of the Yttria-stabilised zirconia (YSZ) TBCs was revealed through experiments and finite element simulations. The YSZ TBCs were prepared via an atmospheric plasma spraying. Subsequently, the CMAS and NaCl corrosion experiments of the TBCs were conducted at 1250℃. The results indicated that the melting sequence of CMAS and NaCl could affect the TBCs failure mode. The coating failure modes of after CMAS+NaCl mixed corrosion and firstly melting NaCl, with secondly melting CMAS corrosion were the buckling failure, and conversely the coating failure mode was the spalling failure. This study provides data support for the optimization of TBC system in complex corrosive environments.
- Thermal barrier coatings,
- CMAS+NaCl,
- Corrosion mechanism,
- Buckling failure,
- Spalling failure

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