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Corrosion Behavior and Failure Prediction of YSZ Coatings Under CMAS Attack

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Abstract

In aeroengines, thermal barrier coatings (TBCs) are usually utilized to protect the hot components from hot gases. The ability to predict the TBC failure is crucial to avoid economic losses. In this study, plasma-sprayed 8 wt.% yttria-stabilized zirconia (YSZ) coatings were subjected to corrosion by calcium–magnesium–aluminosilicate (CMAS, 33CaO–9MgO–13Al2O3–45SiO2) glass at 1250 °C. After the test, two morphologies were observed on the coating surface. At the sample edges, the coating underwent over-sintering because of the locally high temperature: the molten glass easily penetrated the YSZ layer and reacted with it; and iron spinel was detected on the surface. In the sample central region submitted to a relatively lower temperature, a dense layer consisting of both CMAS glass and YSZ was formed. The analysis of the self-luminescence of the YSZ coating after corrosion revealed the presence of sintered regions on the coating surface, which increased as the corrosion temperature increased. This came with a decrease in the coating luminescence. This study shows that the self-luminescence properties can be used to monitor the degree of corrosion and predict the failure of the coating.

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Acknowledgements

This work was supported by the Natural Science Foundation of Liaoning Province (Grant No. 2019-ZD-0283), the China Postdoctoral Science Foundation (Grant No. 2017M621128) and the High-Level Talent Innovation Support Program of Dalian, Liaoning Province (Grant No. 2017RQ056).

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Authors and Affiliations

  1. School of Textile and Material Engineering, Dalian Polytechnic University, No. 1 Qinggongyuan, Dalian, 116034, People’s Republic of China

    Shenghui Han & Jingjing Zhang

  2. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Jingjing Zhang & Tingju Li

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  1. Shenghui Han
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Correspondence to Jingjing Zhang.

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Han, S., Zhang, J. & Li, T. Corrosion Behavior and Failure Prediction of YSZ Coatings Under CMAS Attack. J Therm Spray Tech 30, 708–715 (2021). https://doi.org/10.1007/s11666-020-01141-3

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