铁基FeSiBPCu纳米晶软磁合金粉体的制备及电磁波吸收性能

doi:10.11896/cldb.19050047

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Abstract Fe_83.3Si₄B₈P₄Cu_0.7 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.

Key words： nanocrystalline soft magnetic alloys powders soft magnetic properties EM wave absorption properties ball milling

Published: 26 April 2020

CLC number:

TG132.2+71

Fund:This work was financially supported by the National Natural Science Foundation of China (51771039, 51571047) and the Fundamental Research Funds for the Central Universities (DUT17LAB10)

Corresponding Authors: Yanhui Lireceived his B.S. degree in materials phy-sics from Hefei University of Technology in 2005, and received his Ph.D. degree in materials physics and chemistry from Dalian University of Technology in 2011. He is currently an associate professor in School of Materials Science and Engineering, Dalian University of Technology. His research interests include amorphous/nanocrystalline alloys, magnetic materials, bulk metallic glasses and their composites, and high entropy alloys.

About author:: Chunxuan Zhangreceived his B.E. degree in mate-rial forming and control engineering from Hefei University of Technology in 2016. He is currently pursuing his master degree at School of Materials Science and Engineering, Dalian University of Technology under the supervision of Associate Prof. Yanhui Li. His research has focused on magnetic EM wave absorption materials.

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Cite this article:

ZHANG Chunxuan,LI Yanhui,LI Yanan, et al. Preparation and Electromagnetic Wave Absorption Properties of FeSiBPCu Nanocrystalline Soft Magnetic Alloys Powders[J]. Materials Reports, 2020, 34(10): 10076-10081.

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http://www.mater-rep.com/EN/10.11896/cldb.19050047 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10076

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