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所属单位：材料科学与技术学院

发表刊物：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

关键字：SiC/C foam dielectric property reflection loss effective bandwidth frequency hollow structure

摘要：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.

ISSN号：2168-0485

是否译文：否

发表时间：2019-11-18

合写作者：Ye, Xinli,Li, Min,Wang, Ting,Wu, Cao,曹瑞武,Zhang, Junxiong,Zhou, Qianbo,Liu, Hezhou,Cui, Sheng

通讯作者：陈照峰