Magnetic properties of high permeability iron powder `KIP MG270H' for line filter cores
Magnetic properties of high permeability iron powder `KIP MG270H' for line filter cores
复制标题
线路滤波器芯用高导磁率铁粉“KIP MG270H”的磁性能
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Fujinaga
中科院分区：
文献类型：
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作者：
Y. Ozaki;M. Fujinaga
摘要：研究了还原铁粉芯的初始渗透率与材料特性依赖性、杂质浓度、晶粒尺寸和压实过程中引入的残余应变的关系。杂质（O、C、P和S）的减少和晶粒的粗化对提高透气性是有效的。通过对铁颗粒晶界周围的透射电镜观察，发现沿晶界形成了非磁性夹杂物，其尺寸与纯铁的畴壁厚度相当。这一事实表明，晶界是强钉住畴壁位移的部位。在这些发现的基础上，川崎钢铁开发了一种新的还原铁粉“KIP MG270H”，实现了比传统材料高几百赫兹的磁导率。该材料适用于线噪声滤波器芯。
Synopsis : The initial permeability of reduced iron powder cores has been investigated in relation to the effects of material characteristics dependence, impurity concentration, grain size and residual strain introduced during the compacting process. The reduction of impurities (O, C, P and S) and coarsening of grains have been found effective for improving the permeability. Transmission electron microscope observation around the grain boundaries of an iron particle revealed that nonmagnetic inclusions are formed along the grain boundaries with sizes comparable to the domain wall thickness of pure iron. This fact suggests that the grain boundaries act as the sites of strong pinning of the domain wall displacement. On the basis of these findings, Kawasaki Steel has developed a new reduced iron powder "KIP MG270H", realizing permeability higher than the conventional materials up to several hundreds Hertz. This material is applicable to line noise filter cores.