FeNi含量对FeSiAl/FeNi复合磁粉芯性能的影响

Dependence of properties of FeSiAl/FeNi composite magnetic powder core on the FeNi content

对气雾化法制备的250目FeSiA和400目FeNi磁粉分别进行绝缘包覆,然后按不同质量比混合,经压制成型,制得复合磁粉芯,研究了FeNi细粉的掺入量对复合磁粉芯性能的影响。结果表明,向FeSiAl磁粉中添加FeNi细粉可以提高复合磁粉芯的容积密度和有效磁导率,但损耗也增大。掺入适量的FeNi细粉可有效提高复合磁粉芯的坯体的最大荷重。同时,也可以有效提高复合磁粉芯的直流偏置特性,掺入50 wt%FeNi细颗粒的复合磁粉芯在100 Oe外加直流磁化磁场下显示的直流偏置特性达71.2%。

Two types of gas atomized 250 mesh FeSiAl and 400 mesh FeNi magneticpowders used as raw materials were coated to realize their surface insulation,respectively.The composite magnetic powder cores were obtained by mixing different mass ratios of insulated FeNi powder toinsulated FeSiAl powder followed by cold pressing.The influence of the content of 400-mesh FeNi fine powder is studied on the performance of composite magnetic powder cores.The research shows that adding FeNi fine powder to 250 mesh FeSiAl magnetic powder can increase the bulk density of composite magnetic powder core,reduce the effective demagnetization field and increase the effective permeability of magnetic powder core.Adding proper amount of FeNi fine powder can effectively increase the maximum load of the green body of the composite magnetic powder core,and at the same time,it can also effectively improve the DC bias characteristics of the composite magnetic powder core.The DC bias characteristics of the composite magnetic powder core doped with 50 wt%FeNi fine particles can reach 71.2%under 100 Oe plus DC magnetization magnetic field.