镁热反应制备介孔非均质SiO2@SiC@C微球的吸波性能研究

摘要/Abstract

摘要： 以改良Stöber法合成的介孔SiO₂为前驱体,通过自组装技术在SiO₂表面包覆酚醛树脂,碳化后形成SiO₂@C,再经800 ℃镁热反应得到形貌均匀的介孔非均相SiO₂@SiC@C微球,并利用XRD、XPS、Raman、BET、SEM和TEM对SiO₂@SiC@C进行表征/分析。结果表明,SiO₂@SiC@C微球由SiC、非晶SiO₂、非晶C和SiO_xC_y相组成,且表面存在大量介孔结构。介孔非均相SiO₂@SiC@C微球展现出优异的吸波性能,当模拟匹配厚度为2 mm时,最小反射损耗在17.74 GHz处达到-36.83 dB,当模拟匹配厚度为2.5 mm时,最大吸收带宽达到了6.63 GHz,完全覆盖了Ku段,表现出强吸收、宽频段的性能,这是介孔结构优化阻抗匹配和非均质界面增强界面极化协同作用的结果。本文制备的介孔非均相SiO₂@SiC@C微球可满足电磁波吸收防护领域的应用需求。

关键词: 介孔结构, 界面极化, 电磁波吸收, 镁热反应, SiC, SiO₂

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

中图分类号:

TB742

高博文, 张晓卫, 刘渊, 李琦旺, 陈柳玲, 张卫珂. 镁热反应制备介孔非均质SiO₂@SiC@C微球的吸波性能研究[J]. 硅酸盐通报, 2023, 42(12): 4542-4551.

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.

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镁热反应制备介孔非均质SiO₂@SiC@C微球的吸波性能研究

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

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