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

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 sourc...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2023-07, Vol.30 (7), p.1375-1387
Main Authors: Zhang, Xinyuan, Xia, Chenkang, Liu, Weihai, Hao, Mingyuan, Miao, Yang, Gao, Feng
Format: Article
Language:English
Subjects:
Absorption
Aerogels
Ceramics
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Composite materials
Composites
Corrosion and Coatings
Electromagnetic radiation
Glass
Heat conductivity
Heat resistant materials
Heat transfer
Materials Science
Metallic Materials
Microwave absorption
Natural Materials
Physical properties
Silicon
Silicon carbide
Sol-gel processes
Space shuttles
Surfaces and Interfaces
Thermal conductivity
Thermal properties
Thermal protection
Thermodynamic properties
Thin Films
Tribology
Wave resistance
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Summary: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/cm 3 , the thermal conductivity of 0.0621 W/(m·K), and the specific surface area of 1099 m 2 /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.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-023-2605-x