碳化硅材料吸波性能的研究

Study on the Microwave Absorption Behavior of Silicon Carbide

摘要: 吸波材料能有效吸收电磁波，避免电磁波反射，在军工等领域应用广泛。本实验采用简单易行的机械混合法制备了一系列环氧树脂/碳化硅/镍复合材料并研究了其吸波性能。结果显示，当环氧树脂占比在20 wt%~30 wt%之间时，随着碳化硅含量的增加，环氧树脂/碳化硅复合材料的吸波性能得到显著提升；而在环氧树脂占比20 wt%的环氧树脂/碳化硅/镍复合材料中，随着镍含量的增加，复合材料吸波性能先好后差，其中环氧树脂/碳化硅/镍质量比为2:7:1的样品在材料厚度为1 mm时最低反射率为−13.26 dB，频带宽度约为1.65 GHz，达到了吸波材料基本要求，有望成为8.2~18 GHz波段下性能较好的吸波材料。

Abstract: Microwave absorbing materials can effectively absorb electromagnetic waves and avoid their re-flection, which are widely used in areas such as war industry. A series of epoxy resin/SiC/Ni com-posites were prepared by simple mechanical mixing and their microwave absorption behaviors were investigated. It was found that when the mass proportion of epoxy resin was between 20 wt% and 30 wt%, the microwave absorption behaviors of epoxy resin/SiC composites improved significantly with the increase of the mass proportion of SiC. In the epoxy resin/SiC/Ni composites with 20 wt% epoxy resin, the microwave absorption behaviors of the composites improved first but then deteriorated with the increase of the mass proportion of Ni. The sample with an epoxy res-in/SiC/Ni mass ratio of 2:7:1 and thickness of 1 mm had the minimum reflection loss of −13.26 dB and bandwidth of ~1.65 GHz, which meets the basic requirement for microwave absorbing materi-als, and is expected to be a good microwave absorbing material in the 8.2~18 GHz frequency range.