Yonggang Xu
材料科学技术（英）
The electromagnetic (EM) wave absorbing property of silicone rubber filled with carbonyl iron particles (CIPs) and multi-walled carbon nanotubes (MWCNTs) was examined. Absorbents including MWCNTs and spherical/ flaky CIPs were added to silicone rubber using a two-roll mixer. The complex permittivity and complex permeability were measured over the frequency range of 1{18 GHz. The two EM parameters were verified and the uniform dispersion of MWCNTs and CIPs was confirmed by comparing the measured reflection loss (RL) with the calculated one. As the MWCNT weight percent increased, the RL of the spherical CIPs/silicone rubber composites changed insignificantly. It was attributed to the random distribution of spherical CIPs and less content of MWCNTs. On the contrary, for composites filled with flaky CIPs the absorption bandwidth increased at thickness 0.5 mm (RL value lower than -5 dB in 8-18 GHz) and the absorption ratio increased at lower frequency (minimum {35 dB at 3.5 GHz). This effect was attributed to the oriented distribution of flaky CIPs caused by interactions between the two absorbents. Therefore, mixing MWCNTs and flaky CIPs could achieve wider-band and higher-absorption ratio absorbing materials.
关键词:
Absorbing materials
张宝芹
,
于名讯
,
张伟
,
黄成亮
,
李永波
宇航材料工艺
介绍了各向异性吸波材料高频磁性能,对近年来研究较多的薄膜、纤维、片状磁性吸波材料及其研究进展进行了总结,并分析了在工程化应用中存在的问题,最后,对其发展趋势和方向进行了展望.
关键词:
各向异性
,
电磁性能
,
吸波材料
