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High-temperature dielectric and microwave absorption property of plasma sprayed Ti3SiC2/cordierite coatings

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Abstract

The high-temperature dielectric and microwave absorption property of plasma sprayed Ti3SiC2/cordierite coatings at temperature ranging from 25 to 700 °C in the frequency of 8.2–12.4 GHz were investigated. Both the real and imaginary part of permittivity increase with the elevating temperature, which can be ascribed to the shortened relaxation time and the enhanced electrical conductivity, respectively. Moreover, for as-sprayed Ti3SiC2/cordierite coatings, the results show that the relaxation loss dominates the ε″ at a lower temperature and the electrically conductive loss dominates the ε″ at a higher temperature. Further investigations of microwave absorption property were carried out based on the calculated reflection loss and indicated that the Ti3SiC2/cordierite coating was an excellent absorber at high temperature. At the temperature of 400, 500 and 600 °C, the coating with a thickness of 1.5 mm exhibits a proper microwave absorption property with an effective absorption bandwidth (≤−5 dB) across the whole measured frequency, which indicates the Ti3SiC2/cordierite coating is an excellent absorber at high temperature.

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Acknowledgments

This work was supported by Chinese National Natural Science Foundation (Grant No. 51072165), National Natural Science Foundation of China (No. 51402239), Fundamental Research Funds for the Central Universities (No. 3102014JCY01002), States Key Laboratory of the Solidification Processing in NWPU, Nos. KP201307 and KP201422.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Jinbu Su, Wancheng Zhou, Yi Liu, Yuchang Qing, Fa Luo & Dongmei Zhu

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  1. Jinbu Su
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  2. Wancheng Zhou
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  3. Yi Liu
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  4. Yuchang Qing
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  5. Fa Luo
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  6. Dongmei Zhu
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Correspondence to Jinbu Su.

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Su, J., Zhou, W., Liu, Y. et al. High-temperature dielectric and microwave absorption property of plasma sprayed Ti3SiC2/cordierite coatings. J Mater Sci: Mater Electron 27, 2460–2466 (2016). https://doi.org/10.1007/s10854-015-4046-4

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  • DOI: https://doi.org/10.1007/s10854-015-4046-4

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