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Microstructure Evolution and Interface Stability of Thermal Barrier Coatings with Vertical Type Cracks in Cyclic Thermal Exposure

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Abstract

In this study, the effects of intrinsic feature of microstructure in thermal barrier coatings (TBCs) with and without vertical cracks on the microstructure and mechanical properties were investigated in cyclic thermal exposure. The hardness values of TBCs with vertical cracks were higher than those without vertical cracks, showing a good agreement with microstructure. The TBC prepared without vertical cracks using the 204-NS was delaminated after 250 cycles in the cyclic thermal exposure test. The TBCs with and without vertical cracks prepared with 204 C-NS and the TBC with vertical cracks prepared with 204 NS showed a sound condition without any cracking at the interface or spalling of top coat. After the thermal exposure of 381 cycles, the hardness values were increased in the survived TBC specimens, and the thicknesses of TGO layer for the TBCs with 204 C-NS and 204 NS were measured as in the ranges of 5-9 and 3-7 μm, respectively. In the thermal shock test, the advantage of vertical cracks for thermal durability of TBC could be well investigated, showing relatively longer sustained cycles in the TBCs with vertical cracks. The TBCs with vertical cracks are more efficient in improving thermal durability than those without vertical cracks in cyclic thermal exposure.

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Acknowledgments

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2012-0009450), by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy (10041233), and by the Power Generation & Electricity Delivery of the Korean Institute of Energy Technology Evaluation and Planning (KETEP) grants funded by the Korean Ministry of Knowledge Economy (2011T100200224).

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Authors and Affiliations

  1. School of Nano & Advanced Materials Engineering, Changwon National University, Changwon, Kyungnam, 641-773, Republic of Korea

    Zhe Lu, Sang-Won Myoung, Hyun-Sung Kim, Min-Sik Kim, Je-Hyun Lee & Yeon-Gil Jung

  2. Korea Electric Power Research Institute, Korea Electric Power Corporation, Daejeon, 305-760, Republic of Korea

    Jung-Chel Jang

  3. Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic of Korea

    Ungyu Paik

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  1. Zhe Lu
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  2. Sang-Won Myoung
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Correspondence to Zhe Lu.

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Lu, Z., Myoung, SW., Kim, HS. et al. Microstructure Evolution and Interface Stability of Thermal Barrier Coatings with Vertical Type Cracks in Cyclic Thermal Exposure. J Therm Spray Tech 22, 671–679 (2013). https://doi.org/10.1007/s11666-013-9886-y

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  • DOI: https://doi.org/10.1007/s11666-013-9886-y

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