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Real-time Detection of CMAS Corrosion Failure in APS Thermal Barrier Coatings Under Thermal Shock

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Abstract

Calcium-magnesium-alumina-silicate (CMAS) corrosion has been regarded as the most important factor that leads to the degradation of thermal barrier coatings (TBCs). The failure mechanism of TBCs attacked by CMAS corrosion in the actual service conditions is still not clear due to the lack of an environmental simulator and nondestructive testing techniques. To solve the above problems, a real-time acoustic emission method combined with infrared thermography are developed to investigate the failure mechanism of TBCs attacked by CMAS corrosion. The results show that the acoustic emission signal spectrum only depends on the failure mode of the TBCs, and five failure modes are identified: surface vertical cracks, sliding interfacial cracks, opening interfacial cracks, substrate deformation and noise. The lifetime of TBCs attacked by CMAS corrosion is 40 thermal shock cycles, which is nearly six times lower than that of TBCs without CMAS corrosion (350 cycles). Conclusions: The failure mechanism of the former is interlaminar cracking and delamination in the ceramic coating; while that for the latter is interfacial delamination in the vicinity of thermal growth oxide.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11890684, 51590891 and 51672233), the Foundation for Innovative Research Groups of Hunan Province (Grant No. 2020JJ10005) and the Outstanding Youth Science Foundation of Hunan Province (Grant No. 2020JJ30031).

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Authors and Affiliations

  1. Key Laboratory of Key Film Materials & Application for Equipment (Hunan province), School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, Hunan, China

    W. Zhu, Z. Y. Li, L. Yang, Y. C. Zhou & J. F. Wei

  2. Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, Hunan, China

    W. Zhu, Z. Y. Li, L. Yang, Y. C. Zhou & J. F. Wei

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  1. W. Zhu
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  2. Z. Y. Li
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Correspondence to L. Yang.

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Zhu, W., Li, Z.Y., Yang, L. et al. Real-time Detection of CMAS Corrosion Failure in APS Thermal Barrier Coatings Under Thermal Shock. Exp Mech 60, 775–785 (2020). https://doi.org/10.1007/s11340-020-00603-7

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