Abstract
Fe-SiC/SiO2 monolithic composites with ordered inter-filled structure and high crystallinity were successfully prepared by nanocasting and cold-pressing at 1200°C, using polycarbosilane as a precursor and ordered mesoporous silica SBA-15 as a template. In the composites, SiC particles can be endowed with high crystallinity by a trace of Fe-doping and incorporated into nanochannels of the SBA-15 to form the ordered rodlike arrays. Their high-temperature microwave absorbing properties were investigated from 25 to 500°C in X-band (8.2–12.4GHz), in which SiC particles acted as electromagnetic (EM) wave absorbers and SiO2 as EM wave transparent matrix. Both of the complex permittivity and dielectric loss gradually enhanced with the rising temperatures. A minimum reflection loss (RL) value of −32dB and a broader absorption band (RL<−10dB) over the whole X-band (4.2GHz) were obtained for the Fe-SiC/SiO2 at 500°C. These good properties were attributed to the enhanced dielectric loss resulting from the intrinsic physical properties and special structures. Such monolithic composite exhibited a promising prospect as a high-temperature microwave absorbing material.
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