Preparation and Electromagnetic Wave Absorption Properties of FeSiBPCu Nanocrystalline Soft Magnetic Alloys Powders
ZHANG Chunxuan, LI Yanhui, LI Yanan, ZHANG Wei
Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Abstract: Fe83.3Si4B8P4Cu0.7 nanocrystalline alloy powders with outstanding electromagnetic (EM) wave absorption properties in high frequency were prepared by a high-energy ball milling method. The effects of milling time on structure, morphology, EM parameters and EM wave absorption properties of the powders were investigated. Microstructure and morphology of the powders were characterized by XRD and SEM, respectively. EM parameters were measured by a network vector analyzer in the frequency range of 2—18 GHz, and reflection losses (RL) evaluating EM wave absorption properties were calculated according to transmission line theory. The results showed that near spherical powders with average particle sizes of 4.7—10.9 μm have been formed after milling for 20—140 h. The powders possess an α-Fe nanocrystalline/amorphous compo-site structure, and the average grain size of the α-Fe phase decreases with increasing milling time to 60 h and then maintains at about 6 nm for longer milling time. The alloy powders exhibit excellent soft magnetic properties, and have the highest saturation magnetization of 182.3 emu/g after milling for 100 h. The powders possess high permeability, matchable permittivity, and excellent EM wave absorption properties. The powders milled for 100 h and paraffin composite sample with a thickness of 2.0 mm exhibits the minimum RL of -44.0 dB at 11.5 GHz, and effective absorption bandwidth (RL<-10 dB) is 5.8 GHz covering 9.2—15.0 GHz.
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2020, Vol. 34 
