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An Effective Electrical Resonance-Based Method to Detect Delamination in Thermal Barrier Coating

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Abstract

This research proposes a simple yet highly sensitive method based on electrical resonance of an eddy-current probe to detect delamination of thermal barrier coating (TBC). This method can directly measure the mechanical characteristics of TBC compared to conventional ultrasonic testing and infrared thermography methods. The electrical resonance-based method can detect the delamination of TBC from the metallic bond coat by shifting the electrical impedance of eddy current testing (ECT) probe coupling with degraded TBC, and, due to this shift, the resonant frequencies near the peak impedance of ECT probe revealed high sensitivity to the delamination. In order to verify the performance of the proposed method, a simple experiment is performed with degraded TBC specimens by thermal cyclic exposure. Consequently, the delamination with growth of thermally grown oxide in a TBC system is experimentally identified. Additionally, the results are in good agreement with the results obtained from ultrasonic C-scanning.

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Acknowledgments

This work was supported by the Basic Science Research Program provided by National Research Foundation of Korea (NRF), funded by the Ministry of Science, and ICT and Future Planning (Grant No. 2011-0020024).

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Authors and Affiliations

  1. School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Suwon, Gyeonggi-do, 16419, South Korea

    Jong Min Kim, Ho Girl Lee, Hak-Joon Kim, Sung-Jin Song, Chang-Sung Seok & Young-Ze Lee

  2. Center for Safety Measurement, Korea Research Institute of Standards and Science, 267 Gajeong-ro Yuseong-gu, Daejeon, 34113, South Korea

    Jae-Ha Park

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  1. Jong Min Kim
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  2. Jae-Ha Park
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  3. Ho Girl Lee
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  4. Hak-Joon Kim
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  6. Chang-Sung Seok
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  7. Young-Ze Lee
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Correspondence to Jong Min Kim.

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Kim, J.M., Park, JH., Lee, H.G. et al. An Effective Electrical Resonance-Based Method to Detect Delamination in Thermal Barrier Coating. J Therm Spray Tech 27, 336–343 (2018). https://doi.org/10.1007/s11666-017-0670-2

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  • DOI: https://doi.org/10.1007/s11666-017-0670-2

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