Aligning flaky FeSiAl particles with a two-dimensional rotating magnetic field to improve microwave-absorbing and shielding properties of composites
Aligning flaky FeSiAl particles with a two-dimensional rotating magnetic field to improve microwave-absorbing and shielding properties of composites
复制标题
将片状 FeSiAl 颗粒与二维旋转磁场对齐以提高复合材料的微波吸收和屏蔽性能
DOI：
10.1016/j.jmmm.2018.02.091
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发表时间：
2018-07
影响因子：
2.7
通讯作者：
Zhang Deyuan
中科院分区：
文献类型：
--
作者：
Liu Chang;Cai Jun;Duan Yubing;Li Xinghao;Zhang Deyuan
为了提高复合材料的微波吸收和屏蔽性能，嵌入在环氧树脂聚合物中的纳米FeSiAl颗粒与二维旋转磁场对齐。研究了非取向和取向FeSiAl/环氧复合材料的形貌、电磁特性、吸波屏蔽性能。结果表明，取向处理后，取向FeSiAl颗粒在旋转磁场中趋于均匀取向，取向复合材料在1-18 GHz频率范围内的介电常数和磁导率均比随机分布的复合材料有所提高。计算结果表明，取向复合材料的回波损耗（RL）峰值可达8.8dB，而厚度为2.5mm（60wt%）的非取向复合材料的回波损耗峰值为5.8dB，RL值大于6dB的频带宽度在1 ~ 2.8GHz之间。计算结果表明，取向复合材料的屏蔽效能比未取向复合材料的屏蔽效能提高了1.1 ~ 3倍，取向复合材料在18 GHz、厚度为2.5mm时的最大屏蔽效能为31.8dB。
In order to enhance the microwave-absorbing and shielding properties of the composites, the flaky FeSiAl particles embedded in an epoxy polymer were aligned with a two-dimensional rotating magnetic field. The morphologies, electromagnetic (EM) characteristics, and microwave-absorbing and shielding properties of the unaligned and aligned FeSiAl/epoxy composites were investigated. The results showed that after alignment treatment, the flaky FeSiAl particles tend to orient uniformly in the rotating magnetic field, and the permittivity and permeability of the aligned composites were increased in the frequency range of 1–18 GHz compared with that of randomly distributed composites. The calculated microwave-absorbing properties indicated that the peak value of the return loss (RL) of the aligned composites can reach 8.8 dB, compared with 5.8 dB of the unaligned composites of 2.5 mm in thickness (60 wt%); and the bandwidth with RL value more than 6 dB is in a wider frequency range from 1 to 2.8 GHz. And the calculated shielding effectiveness (SE) of the aligned composites is 1.1–3 times higher than that of unaligned one in every thickness, and the maximum SE of the aligned one is 31.8 dB at 18 GHz with a thickness of 2.5 mm.
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