Microwave Absorbing Properties of Mesoporous Heterogeneous SiO2@SiC@C Microsphere Prepared by Magnesiothermic Reaction

Abstract

Abstract: The mesoporous SiO₂ synthesized by modified Stöber method was used as precursor. The phenolic resin was coated on the surface of SiO₂ by self-assembly technology and SiO₂@C was formed after carbonization. The mesoporous heterogeneous SiO₂@SiC@C microspheres with uniform morphology were obtained by magnesiothermic reaction at 800 ℃. As shown in the characterization results of XRD, XPS, Raman, BET, SEM and TEM, the SiO₂@SiC@C microspheres were composed of SiC, amorphous SiO₂, amorphous C and SiO_xC_y phases, and a large number of mesoporous structures can be found on the surface. The mesoporous heterogeneous SiO₂@SiC@C microspheres exhibit excellent microwave absorption performance in the simulation results of microwave absorption performance. When the simulated matching thickness is 2 mm, the minimum reflection loss reaches-36.83 dB at 17.74 GHz. The maximum absorption bandwidth reaches 6.63 GHz at the simulated matching thickness of 2.5 mm, completely covering the Ku band. The mesoporous heterogeneous SiO₂@SiC@C microspheres show strong absorption and wide frequency band. This is the result of the synergistic effect of mesoporous structure optimizing the impedance matching and heterogeneous interface enhancing the interface polarization. The mesoporous heterogeneous SiO₂@SiC@C microspheres prepared in this experiment can meet the application requirements in the field of electromagnetic wave absorption protection.

Key words: mesoporous structure, interface polarization, electromagnetic wave absorption, magnesium thermal reaction, SiC, SiO₂

CLC Number:

TB742

GAO Bowen, ZHANG Xiaowei, LIU Yuan, LI Qiwang, CHEN Liuling, ZHANG Weike. Microwave Absorbing Properties of Mesoporous Heterogeneous SiO₂@SiC@C Microsphere Prepared by Magnesiothermic Reaction[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4542-4551.

References

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Microwave Absorbing Properties of Mesoporous Heterogeneous SiO₂@SiC@C Microsphere Prepared by Magnesiothermic Reaction

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