(中南大學(xué) 粉末冶金院國家重點實驗室，長沙 410083)
摘 要: 以羰基鐵粉和羰基鎳粉為原料，采用金屬注射成形(MIM)工藝制備Fe-50%Ni軟磁合金。通過對不同工藝條件下試樣的雜質(zhì)含量、密度、金相組織和磁性能的分析，研究顯微結(jié)構(gòu)和雜質(zhì)對磁性能的影響。結(jié)果表明：孔隙是影響MIM Fe-50%Ni飽和磁感應(yīng)強度的主要因素，孔隙、雜質(zhì)和晶粒尺寸是影響磁導(dǎo)率和矯頑力的因素；最大磁導(dǎo)率、初始磁導(dǎo)率和矯頑力之間存在一定的聯(lián)系，矯頑力可以作為最大磁導(dǎo)率和初始磁導(dǎo)率的參考依據(jù)。通過對比分析孔隙度、雜質(zhì)含量和晶粒尺寸對矯頑力的影響規(guī)律，發(fā)現(xiàn)晶粒尺寸是影響MIM Fe-50%Ni合金矯頑力的主要因素。
關(guān)鍵字: Fe-50%Ni軟磁合金；雜質(zhì)；顯微結(jié)構(gòu)；磁性能
magnetic properties of metal injection molding Fe-50%Ni alloy
（State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: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.
Key words: Fe-50%Ni soft magnetic alloy; impurity; microstructure; magnetic properties
