Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 22, Pages 18395-18404Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b04062
Keywords
SiC/C foam; dielectric property; reflection loss; effective bandwidth frequency; hollow structure
Categories
Funding
- National Natural Science Foundation of China [51772151]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_0178]
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The porous structure has been proved to be beneficial to improve the microwave absorption performance. In this rticle, the SiC coating reinforced carbon foam (SiC/C) was synthesized via the direct pyrolysis of melamine foam and chemical vapor deposition process of SiC coating. Then the wrapping architecture consisting of three-dimensional carbon foam and ultrathin SiC coating was annealed at elevated temperature. The result shows that the anneal temperature does have a big impact on the dielectric property as the real and imaginary permittivities remain at a certain level with the increasing heat treatment temperature and finally drop to a low level until 900 degrees C. After being heated at 900 degrees C, the SiC/C foam attains a minimum reflection loss value of -51.58 dB with a matching thickness of 3.60 mm at 8.96 GHz, which is enhanced by 30.88% compared with the raw SiC/C foam. It also possesses an effective bandwidth frequency of 10.84 GHz ranging from 7.16 to 18.00 GHz, which is ascribed to the three-dimensional hollow structure to improve the polarization relaxation and interfacial polarization. The superior microwave absorption performance guarantees the potential application of a promising efficient microwave absorber in the harsh realities.
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