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.
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Acknowledgements
This work is supported by the funds of the Natural Science Foundation of China (51502164), Natural Science Foundation of Shaanxi (2017JM5041), Doctoral Scientific Research Foundation of Shaanxi University of Science and Technology (BJ16-05), Scientific Research Fund of San Qin Scholar (BJ11-26), and College Students’ Innovation Fund of China (201610708025).
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Yuan, X., Wang, X., Tang, Q. et al. Ordered mesoporous inter-filled SiC/SiO2 composites with high-performance microwave absorption by adding ethylenediamine. J Mater Sci 52, 13163–13172 (2017). https://doi.org/10.1007/s10853-017-1428-4
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DOI: https://doi.org/10.1007/s10853-017-1428-4