Microwave absorption properties of FeSi flaky particles prepared via a ball-milling process
Microwave absorption properties of FeSi flaky particles prepared via a ball-milling process
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球磨法制备FeSi片状颗粒的微波吸收性能
DOI：
10.1016/j.jmmm.2015.06.085
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发表时间：
2015-12-01
影响因子：
2.7
通讯作者：
Zhen, Liang
中科院分区：
文献类型：
--
作者：
Liu, Chao;Yuan, Yong;Zhen, Liang
通过球磨和随后的退火制备了具有不同长径比的片状FeSi合金颗粒。采用XRD和SEM对产物的微观结构和形貌进行了表征。测试了材料的直流电阻率、静态磁化特性和电磁特性。发现具有高长径比的颗粒具有高的介电常数和磁导率。另一方面，发现晶粒尺寸和缺陷密度的变化影响介电常数和磁导率。高的比表面积被认为有助于强的介电损耗和高的形状磁各向异性导致在目标带中的高磁导率。电磁参数的增加迫使吸收峰向低频移动。以球磨12 h的FeSi合金颗粒为填料制备的涂层在2 GHz处的反射损耗为-10 dB，匹配厚度为1.88 mm。通过球磨和退火制备的FeSi合金颗粒可用于1-4 GHz波段的ELM。(C)2015 Elsevier B. V.版权所有。
Flaky FeSi alloy particles with different aspect ratio were produced via ball-milling and a subsequent annealing. The microstructure and the morphology of the particles were examined by XRD and SEM. The dc resistivity, the static magnetization properties and electromagnetic properties were measured. Particles with high aspect ratio were found possess high permittivity and permeability. On the other hand, the variation of grain size and defects density was found influence the permittivity and permeability. High specific area was believed contribute to the intense dielectric loss and the high shape magnetic anisotropy lead to high permeability in the target band. Increased electromagnetic parameters compel the absorption peak's shift to lower frequency. Coating using flaky FeSi particles milled for 12 h as fillers presented a reflection loss of -10 dB at 2 GHz and a matching thickness of 1.88 mm. The flaky FeSi alloy particles prepared through ball-milling and annealing can be promising candidates for ELM application at 1-4 GHz band. (C) 2015 Elsevier B.V. All rights reserved.