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Residual Stress Change in Thermal Barrier Coating Due to Thermal Exposure Evaluated by Curvature Method

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Abstract

Thermal barrier coatings (TBCs) are used to protect the hot sections of gas turbine and jet engines. A TBC system comprises of a substrate, bond coat (BC), and TBC top coat (TC). The residual stress development mechanism by high temperature exposure in TBC is important in designing a high-performance TBC. However, quantitative studies of the stress change and its modeling are few because of its difficulty. The objective of this study is to reveal the changing mechanism of coating stress under high temperature exposure. For this purpose, we applied a three-layered beam model to evaluate the TBC’s residual stress using the curvature change. Time-dependent residual stresses in the TC and BC thermally exposed at 600-1000 °C were evaluated by the curvature method. Subsequently, we investigated the stress-generating mechanism of the coatings by using a finite element analytical (FEA) model that reproduces the measured curvatures. Our experimental result revealed that the residual stress in the BC changed from tensile to compressive by thermal exposure. However, thermal exposure had an insignificant effect on the residual stress in the TC. These changes in coating stress, including temperature and time dependency, were consistently explained by stress relaxation in the BC using the FEA model.

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Acknowledgments

We wish to thank Dr. T. Kuwashima (Iwate Industrial Research Institute) for preparation of the specimens, and Pulstec Industrial Co., Ltd., for XRD stress measurement. This research was supported by JSPS KAKENHI Grant Number JP17K06039.

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Authors and Affiliations

  1. Graduate School of Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate, 020-8551, Japan

    Tomoyuki Hayase

  2. Department of Systems Innovation Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate, 020-8551, Japan

    Hiroyuki Waki & Kanta Adachi

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  1. Tomoyuki Hayase
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  2. Hiroyuki Waki
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Correspondence to Hiroyuki Waki.

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This article is part of a special topical focus in the Journal of Thermal Spray Technology on Advanced Residual Stress Analysis in Thermal Spray and Cold Spray Processes. This issue was organized by Dr. Vladimir Luzin, Australian Centre for Neutron Scattering; Dr. Seiji Kuroda, National Institute of Materials Science; Dr. Shuo Yin, Trinity College Dublin; and Dr. Andrew Ang, Swinburne University of Technology.

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Hayase, T., Waki, H. & Adachi, K. Residual Stress Change in Thermal Barrier Coating Due to Thermal Exposure Evaluated by Curvature Method. J Therm Spray Tech 29, 1300–1312 (2020). https://doi.org/10.1007/s11666-020-01032-7

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  • DOI: https://doi.org/10.1007/s11666-020-01032-7

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