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Ordered mesoporous inter-filled SiC/SiO2 composites with high-performance microwave absorption by adding ethylenediamine

Author:
Yuan, Xiaoyan, Wang, Xiaolin, Tang, Qingqing, Zhang, Yajuan, Guo, Shouwu
Source:
Journal of materials science 2017 v.52 no.22 pp. 13163-13172
ISSN:
0022-2461
Subject:
silica, silicon carbide, electrical conductivity, absorption, carbon, porous media, pyrolysis
Abstract:
In this study, ordered mesoporous inter-filled silicon carbide/silica composites containing ethylenediamine (EDA-SiC/SiO₂) were fabricated by nanocasting and cold-pressing. The as-prepared composites exhibited enhanced microwave absorption. By multi-technique approach utilization, it was demonstrated that EDA acted as a carbon source during pyrolysis progress. The EDA-SiC/SiO₂ fabricated at 1300 °C exhibited a minimum reflection loss (RL) of −53.0 dB at 10.1 GHz, and effective absorption bandwidth (RL < −10 dB) covered the entire X-band. It was also illustrated that the enhanced dielectric loss originated from the high electrical conductivity induced by the ordered inter-filled network and crystalline carbon. Furthermore, the optimal absorbing thickness was also determined by the impedance match and quarter-wavelength law.
Agid:
5796342