Zhou Bingwen, Lv Mengnan, Wu Jiali, Ya Bin, Meng Linggang, Jianglin Lanqing, Zhang Xingguo
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116081, China.
Ningbo Research Institute, Dalian University of Technology, Ningbo 315000, China.
Materials (Basel). 2022 Mar 31;15(7):2558. doi: 10.3390/ma15072558.
In order to decrease and control electromagnetic pollution, absorbing materials with better electromagnetic wave absorption properties should be developed. In this paper, a nanocrystalline alloy ribbon with the composition of Fe73.2Si16.2B6.6Nb3Cu1 was designed and prepared. Nanocrystalline alloy powder was obtained by high-energy ball milling treatment. The effects of ball milling time on the soft magnetic properties, microstructure, morphology, and electromagnetic wave absorption properties of alloy powder were investigated. The results showed that, as time increased, α-(Fe, Si) gradually transformed into the amorphous phase, and the maximum saturation magnetization (Ms) reached 135.25 emu/g. The nanocrystalline alloy powder was flakelike, and the minimum average particle size of the powder reached 6.87 μm. The alloy powder obtained by ball milling for 12 h had the best electromagnetic absorption performance, and the minimum reflection loss RLmin at the frequency of 6.52 GHz reached −46.15 dB (matched thickness was 3.5 mm). As time increased, the best matched frequency moved to the high-frequency direction, and the best matched thickness decreased, while the maximum effective absorption bandwidth ΔfRL<−10 dB was 7.22 GHz (10.78−18 GHz).
为了减少和控制电磁污染，应开发具有更好电磁波吸收性能的吸收材料。本文设计并制备了一种成分为Fe73.2Si16.2B6.6Nb3Cu1的纳米晶合金薄带。通过高能球磨处理获得纳米晶合金粉末。研究了球磨时间对合金粉末软磁性能、微观结构、形貌和电磁波吸收性能的影响。结果表明，随着时间增加，α-(Fe, Si)逐渐转变为非晶相，最大饱和磁化强度(Ms)达到135.25 emu/g。纳米晶合金粉末呈片状，粉末的最小平均粒径达到6.87μm。球磨12 h获得的合金粉末具有最佳的电磁吸收性能，在6.52 GHz频率下的最小反射损耗RLmin达到−46.15 dB(匹配厚度为3.5 mm)。随着时间增加，最佳匹配频率向高频方向移动，最佳匹配厚度减小，而最大有效吸收带宽ΔfRL<−10 dB为7.22 GHz(10.78−18 GHz)。
