摘要
以非晶Fe-Cr-Si-B-C雾化合金粉末为原料,改变粗粉(−250~+400目)和细粉(−600目)质量比(粉末级配)分别制备软磁粉心,考察了有效磁导率、直流偏置性能和功率损耗。结果表明,软磁粉心的有效磁导率与其密度正相关,适当的级配可有效提升密度。在同一磁导率水平下,适当增加细粉比例可提高磁心内部的气隙分布均匀性,进而提升其偏置性能,并降低高频(MHz)损耗。当粗细合金粉末按40:60质量比混合时,粉心在1 MHz处的有效磁导率为19.52,且直流偏置场为100 Oe时,磁导率百分比为83.04%;1 MHz/20 mT下的损耗为1467.5 mW/cm^(3)。40:60样品相对原始雾化粉样品密度提高2.4%,孔隙率降低5.8%,有效磁导率(1 MHz)提高5.9%。
The atomized powder of amorphous Fe-Cr-Si-B-C was used as raw material,and soft magnetic powder cores were prepared by changing the mixed mass ratio(powder gradation)of coarse powder(−250 to+400 mesh)and fine powder(−600 mesh),respectively.The effective permeability,DC bias performance,and power loss were investigated.Effective permeability is positively correlated with the density of powder core,which can be improved with proper particle grading.When the effective permeability is almost identical to each other,the uniformity of air gap in the magnetic cores can be increased with the proper mass ratio of fine powders.Accordingly,the DC-bias performance can be improved and power loss at high-frequencies(MHz)decreased.The effective permeability was 19.52 at 1 MHz for the sample with the mixing ratio of 40:60(coarse powder:fine powder).Moreover,the percentage of permeability is 83.04%under the DC bias field of 100 Oe.The power loss at 1 MHz/20 mT is 1467.5 mW/cm^(3).The 40:60 sample shows a 2.4%increase in density and a 5.8%reduction in porosity compared to the sample with raw powders,and the effective permeability at 1 MHz increases by 5.9%.
作者
周章桥
李奇
周瑞霖
王韬
聂彦
王鲜
ZHOU Zhang-qiao;LI Qi;ZHOU Rui-lin;WANG Tao;NIE Yan;WANG Xian(School of Integrated Circuits,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《磁性材料及器件》
CAS
2024年第6期18-23,共6页
Journal of Magnetic Materials and Devices
基金
湖北省重点研发计划项目(2022BAA022)。
