Zheng Yu, Wu Mei, Qian Congyi, Jin Yuxin, Xiao Wei, Liang Xiaohui
Hangzhou Dianzi University, Hangzhou 310018, China.
Nanomaterials (Basel). 2023 Mar 3;13(5):930. doi: 10.3390/nano13050930.
Magnetic materials have a very broad application prospect in the field of microwave absorption, among which soft magnetic materials become the focus of magnetic materials research because of their high saturation magnetization and low coercivity. FeNi alloy has been widely used in soft magnetic materials because of its excellent ferromagnetism and electrical conductivity. In this work, FeNi alloy was prepared by the liquid reduction method. The effect of the filling ratio of FeNi alloy on the electromagnetic properties of absorbing materials was studied. It is found that the impedance matching ability of FeNi alloy is better when the filling ratio is 70 wt% than that of other samples with different filling ratios (30-60 wt%), showing better microwave absorption characteristics. When the matching thickness is 2.35 mm, the minimum reflection loss (RL) of FeNi alloy with a 70 wt% filling ratio reaches -40.33 dB, and the effective absorption bandwidth is 5.5 GHz. When the matching thickness is between 2 and 3 mm, the effective absorption bandwidth ranges from 7.21 GHz to 17.81 GHz, almost covering the whole X and Ku bands (8-18 GHz). The results show that FeNi alloy has adjustable electromagnetic properties and microwave absorption properties with different filling ratios, which is conducive to selecting excellent microwave absorption materials.
磁性材料在微波吸收领域具有非常广阔的应用前景，其中软磁材料因其高饱和磁化强度和低矫顽力而成为磁性材料研究的重点。FeNi合金因其优异的铁磁性和导电性而被广泛应用于软磁材料中。在本工作中，采用液相还原法制备了FeNi合金。研究了FeNi合金填充率对吸波材料电磁性能的影响。结果发现，当填充率为70 wt%时，FeNi合金的阻抗匹配能力优于其他不同填充率（30 - 60 wt%）的样品，表现出更好的微波吸收特性。当匹配厚度为2.35 mm时，填充率为70 wt%的FeNi合金的最小反射损耗（RL）达到-40.33 dB，有效吸收带宽为5.5 GHz。当匹配厚度在2至3 mm之间时，有效吸收带宽在7.21 GHz至17.81 GHz之间，几乎覆盖了整个X和Ku波段（8 - 18 GHz）。结果表明，FeNi合金具有不同填充率下可调节的电磁性能和微波吸收性能，有利于筛选出优异的微波吸收材料。
