Fe-50％Ni soft magnetic alloy was prepared through metal injection molding (MIM) technique using carbonyl iron powder and carbonyl nickel powder as raw materials. The effects of microstructure and impurity levels on the magnetic properties of MIM Fe-50％Ni soft magnetic alloy were investigated. The results show that the saturation induction is mainly influenced by porosity, while the porosity, impurity levels and grain size play an important role on the permeability and coercive force. There is a quantitative relationships among coercive force, maximum permeability and initial permeability. The maximum permeability and initial permeability can be characterized by the coercive force. The grain size is the predominant factor influencing coercive force compared with the porosity and impurities.%以羰基铁粉和羰基镍粉为原料,采用金属注射成形(MIM)工艺制备Fe-50%Ni软磁合金.通过对不同工艺条件下试样的杂质含量、密度、金相组织和磁性能的分析,研究显微结构和杂质对磁性能的影响.结果表明:孔隙是影响MIM Fe-50%Ni饱和磁感应强度的主要因素,孔隙、杂质和晶粒尺寸是影响磁导率和矫顽力的因素;最大磁导率、初始磁导率和矫顽力之间存在一定的联系,矫顽力可以作为最大磁导率和初始磁导率的参考依据.通过对比分析孔隙度、杂质含量和晶粒尺寸对矫顽力的影响规律,发现晶粒尺寸是影响MIM Fe-50%Ni合金矫顽力的主要因素.
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