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Impedance Analysis of 7YSZ Thermal Barrier Coatings During High-Temperature Oxidation

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Abstract

ZrO2-7 wt.%Y2O3 (7YSZ) thermal barrier coatings (TBCs) were prepared by atmospheric plasma spraying. High-temperature oxidation of 7YSZ TBCs was accomplished at 950 °C and characterized by impedance spectroscopy and scanning electron microscopy with energy-dispersive spectrometry. The results indicated that the thermally grown oxide (TGO) mainly contained alumina. The increase of the thickness of the TGO layer appeared to follow a parabolic law. Impedance analysis demonstrated that the resistance of the TGO increased with increasing oxidation time, also following a parabolic law, and that characterization of the TGO thickness based on fitting an equivalent circuit to its measured resistance is feasible. The YSZ grain-boundary resistance increased due to increasing cracks within the coating for oxidation time less than 50 h. However, beyond 150 h, the YSZ grain-boundary resistance slightly decreased, mainly due to sintering of the coating during the oxidation process.

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Acknowledgements

We would like to acknowledge the financial support from Fundamental Research on Thermal Protection (Grant No. 2016A030312015), Development and Application of Technology of Advanced Plasma Spraying (Grant No. 2013B050800031), Development and Application of Technology of Advanced High Temperature Protective Coating (Grant No. 2013B010102023), and Construction of Sino - French Modern Material Surface Engineering Technology International Cooperation Base (Grant No. 2014B050502008).

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Authors and Affiliations

  1. School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China

    Wen-Long Chen

  2. National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China

    Wen-Long Chen, Min Liu & Ji-Fu Zhang

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  1. Wen-Long Chen
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  2. Min Liu
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Correspondence to Min Liu.

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Chen, WL., Liu, M. & Zhang, JF. Impedance Analysis of 7YSZ Thermal Barrier Coatings During High-Temperature Oxidation. J Therm Spray Tech 25, 1596–1603 (2016). https://doi.org/10.1007/s11666-016-0471-z

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  • DOI: https://doi.org/10.1007/s11666-016-0471-z

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