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Microwave absorption and thermal properties of coral-like SiC aerogel composites prepared by water glass as a silicon source

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Abstract

As a heat-resistant wave-absorbing material, silicon carbide (SiC) aerogel has become a research hotspot at present. However, the most common silicon sources are organosilanes, which are costly and toxic. In this work, SiC aerogels were successfully prepared by using water glass as the silicon source. Specifically, the microstructure and chemical composition of SiC aerogels were controlled by adjusting the Si to C molar ratio during the sol–gel process, and the effect on SiC aerogel microwave absorption properties was investigated. The SiC aerogels prepared with Si:C molar ratio of 1:1 have an effective electromagnetic wave absorption capacity, with a minimum reflection loss value of −46.30 dB at 12.88 GHz and an effective frequency bandwidth of 4.02 GHz. They also have good physical properties, such as the density of 0.0444 g/cm3, the thermal conductivity of 0.0621 W/(m·K), and the specific surface area of 1099 m2/g. These lightweight composites with microwave-absorbing properties and low thermal conductivity can be used as thermal protection materials for space shuttles and reusable carriers.

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Acknowledgements

This research was supported by the Program of Applied Basic Research Program of Shanxi Province, China (No. 202103021223055), the Shanxi Scholarship Council of China, and the Key R&D program of Shanxi Province, China (No. 202102030201006).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    **nyuan Zhang, Chenkang **a, Weihai Liu, Mingyuan Hao, Yang Miao & Feng Gao

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  1. **nyuan Zhang
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  2. Chenkang **a
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  3. Weihai Liu
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  4. Mingyuan Hao
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  5. Yang Miao
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Correspondence to Yang Miao.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Zhang, X., **a, C., Liu, W. et al. Microwave absorption and thermal properties of coral-like SiC aerogel composites prepared by water glass as a silicon source. Int J Miner Metall Mater 30, 1375–1387 (2023). https://doi.org/10.1007/s12613-023-2605-x

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  • DOI: https://doi.org/10.1007/s12613-023-2605-x

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