Enhancement of electromagnetic and microwave absorbing properties of gas atomized Fe-50 wt%Ni alloy by shape modification
Enhancement of electromagnetic and microwave absorbing properties of gas atomized Fe-50 wt%Ni alloy by shape modification
复制标题
DOI：
10.1016/j.jmmm.2012.03.029
复制
发表时间：
2012-08-01
影响因子：
2.7
通讯作者：
Qiu, Tai
中科院分区：
文献类型：
--
作者：
Feng, Yongbao;Qiu, Tai
为了提高fe - 50wt %Ni合金的电磁参数，提高其在1 ~ 4ghz范围内的吸波性能，在行星磨床上对球形fe - 50wt %Ni合金进行了气雾化加工。采用扫描电镜、x射线衍射和振动样品磁强计研究了FeNi合金颗粒的形貌、相组成和饱和磁化强度。利用矢量网络分析仪和传输线理论，研究了乙烯-丙烯-二烯单体橡胶和Fe-50 wt%Ni合金的复合介电常数、复合磁导率和反射损耗。结果表明：fe - 50wt %Ni雾化粉末的形貌可以通过机械铣削得到。在10 ~ 30 h内，随着铣削时间的增加，Fe-50 wt%的片状Ni颗粒的长宽比逐渐增大。机械铣削对FeNi合金的相组成没有影响，但峰强度降低，峰宽变宽。随着磨矿时间的延长，饱和磁化强度减小，矫顽力增大。随着长宽比的增大，材料的电磁参数和吸波性能得到增强。在1 ~ 4 GHz频率范围内，Fe-50 wt%Ni片状粉末填充30 h的橡胶吸波器具有较低的反射损耗。(C) 2012 Elsevier B.V.版权所有
In order to increase the electromagnetic parameters and improve the microwave absorbing properties in the range of 1-4 GHz, gas atomized Fe-50 wt%Ni alloys with spherical form were processed in a planetary mill. The morphology, phase composition and saturation magnetization of the FeNi alloy particles were investigated by means of scanning electron microscopy, X-ray diffraction and vibrating sample magnetometer. The complex permittivity, complex permeability and reflection loss of the microwave absorbing material made from Ethylene-Propylene-Diene Monomer rubber, and the Fe-50 wt%Ni alloys were also studied using vector network analyzer and transmission line theory. The results show that the shape of the atomized Fe-50 wt%Ni powders can be modified by mechanical milling. The flaky Fe-50 wt% Ni particles were prepared, and the aspect ratio increases with increasing the milling time from 10 to 30 h. Mechanical milling does not change the phase compositions of the FeNi alloys but decreases the peak intensity and broadens the peak width. The saturation magnetization decreases and the coercivity increases as the milling time increases. The electromagnetic parameters and microwave absorbing properties are enhanced with the increase of the aspect ratio. The rubber absorbers filled with flaky Fe-50 wt%Ni powders milled for 30 h exhibit the low reflection loss in the 1-4 GHz frequency range. (C) 2012 Elsevier B.V. All rights reserved.