Electromagnetic microwave absorption of Fe–Si flakes with different mixtures
Electromagnetic microwave absorption of Fe–Si flakes with different mixtures
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DOI：
10.1016/j.jmmm.2013.03.003
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发表时间：
2013-08
影响因子：
2.7
通讯作者：
N. Tian;C. You;J. Liu;F. Qu;C. Wang;Z. X. Lu
中科院分区：
文献类型：
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作者：
N. Tian;C. You;J. Liu;F. Qu;C. Wang;Z. X. Lu
制备了Fe-Si合金薄片以获得相对高的磁导率。将石墨烯、TiO 2和ZnO添加剂与Fe-Si薄片混合。Fe-Si合金薄片的磁性能受混合的影响较小，复磁导率的降低不大。但与石墨烯、TiO 2或ZnO混合后，由于界面电阻率的提高，复合材料的复介电常数显著降低，从而实现了更好的电磁阻抗匹配。结果表明，掺混TiO 2的微波吸收性能最好：当吸收体厚度为1.5mm时，在7.1GHz处反射损耗最小为-14.1dB，在3.6GHz处反射损耗小于-10dB;当吸收体厚度为2.4mm时，在4.2GHz处反射损耗最小为-35.3dB。石墨烯、TiO 2和ZnO添加剂对电磁性能的不同影响主要与添加剂的形貌有关，而与其本征特性无关。
Flakes of Fe–Si alloy were fabricated to get a relatively high permeability. Additives of graphene, TiO2and ZnO were mixed with the Fe–Si flakes. The magnetic properties of the Fe–Si alloy flakes were slightly affected by mixing, causing little decrease of the complex permeability. But the complex permittivity was significantly reduced due to the enhanced interfacial resistivity after mixing with graphene, TiO2or ZnO, resulting in a better electromagnetic impedance matching. The best microwave absorption performance was achieved by mixing TiO2: for an absorber thickness of 1.5mm, a minimum reflection loss (RL) of −14.1dB was obtained at 7.1GHz with a large width of 3.6GHz in which the RL is lower than −10dB; with the absorber thickness of 2.4mm, the minimum RL reaches −35.3dB at 4.2GHz. The different effects among graphene, TiO2and ZnO additives on the electromagnetic properties are mainly related to the morphology of the additives rather than their intrinsic characteristics.