Journal of Materials Science, Vol.52, No.22, 13163-13172, 2017
Ordered mesoporous inter-filled SiC/SiO2 composites with high-performance microwave absorption by adding ethylenediamine
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 A degrees 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.