Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8153171 | Journal of Magnetism and Magnetic Materials | 2018 | 7 Pages |
Abstract
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 1-18â¯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 8.8â¯dB, compared with 5.8â¯dB of the unaligned composites of 2.5â¯mm in thickness (60â¯wt%); and the bandwidth with RL value more than 6â¯dB is in a wider frequency range from 1 to 2.8â¯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 31.8â¯dB at 18â¯GHz with a thickness of 2.5â¯mm.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Chang Liu, Jun Cai, Yubing Duan, Xinghao Li, Deyuan Zhang,