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In situ observation and strain distribution measurements of atmospheric plasma-sprayed mullite and Si multilayered coatings on SiC substrates

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Abstract

A mullite/Si multilayer coating was deposited on a SiC substrate using atmospheric plasma spraying. Mud cracking of the protective surface mullite layer was examined using a high-temperature observation system (HTOS). In-plane surface strain distributions were also measured using the digital image correlation (DIC) method. The experimental results showed that mud cracks nucleated in the mullite layer during heating, primarily due to shrinkage of the mullite during crystallization. The cracking event was detectable by mapping the maximum principal strain distribution. We clearly demonstrated that HTOS and DIC are effective tools for investigating the degradation mechanisms of thick coatings at high temperatures.

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Acknowledgements

This research was partially supported by a Grant-in-Aid for Young Scientists (B) by the Ministry of Education, Culture, Sports, Science and Technology (MEXT, Japan), No. 17K18144.

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Authors and Affiliations

  1. Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1, Niijyuku, Katsushika-ku, Tokyo, 125-8585, Japan

    Ryo Inoue

  2. Katayanagi Advanced Research Laboratories, Tokyo University of Technology, 1404-1 Katakuramachi, Hachioji, Tokyo, 192-0982, Japan

    Yutaro Arai

  3. Bonding and Manufacturing Field, Structural Non-oxide Ceramics Group, Research Center for Structural Materials, National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0021, Japan

    Hideki Kakisawa

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  1. Ryo Inoue
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Correspondence to Ryo Inoue.

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Inoue, R., Arai, Y. & Kakisawa, H. In situ observation and strain distribution measurements of atmospheric plasma-sprayed mullite and Si multilayered coatings on SiC substrates. J Mater Sci 54, 2824–2835 (2019). https://doi.org/10.1007/s10853-018-3080-z

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