粉末级配对非晶Fe-Cr-Si-B-C软磁粉心的性能影响
Effect of partcle grading on the properties of amorphous Fe-Cr-Si-B-C soft magnetic powder cores
周章桥 1李奇 1周瑞霖 1王韬 1聂彦 1王鲜1
作者信息
- 1. 华中科技大学集成电路学院,湖北 武汉 430074
- 折叠
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/cm3.40:60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%.
Abstract
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/cm3.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%.
关键词
非晶Fe-Cr-Si-B-C合金粉末/软磁粉心/粉末级配/直流偏置性能Key words
Fe-Cr-Si-B-C amorphous powders/soft magnetic powder cores/particle grading/DC-bias performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据