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

Xinyuan Zhang; Chenkang Xia; Weihai Liu; Mingyuan Hao; Yang Miao; Feng Gao

doi:10.1007/s12613-023-2605-x

Volume 30 Issue 7

Jul. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(7): 1375-1387

Xinyuan Zhang, Chenkang Xia, Weihai Liu, Mingyuan Hao, Yang Miao, and Feng Gao, 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(2023), No. 7, pp. 1375-1387. https://doi.org/10.1007/s12613-023-2605-x

Cite this article as:

Xinyuan Zhang, Chenkang Xia, Weihai Liu, Mingyuan Hao, Yang Miao, and Feng Gao, 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(2023), No. 7, pp. 1375-1387. https://doi.org/10.1007/s12613-023-2605-x

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Research Article

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

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Corresponding author:
Yang Miao E-mail: miaoyang198781@163.com
Received: 26 October 2022; Revised: 20 January 2023; Accepted: 1 February 2023; Available online: 2 February 2023

Abstract

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.
- water glass;
- silicon carbide aerogel;
- microwave absorbing;
- thermal insulation performance

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