Fabrication of High Performance Fe-Si-Al Soft Magnetic Composites

Abstract

Soft magnetic composites (SMC) offers several advantages over traditional soft magnetic materials, for example, new shaping possibilities opens up for 3D design, very low eddy current loss, high magnetic permeability, high resistivity and low coercivity[1]. In recent years, effect of particle size, magnetic particle content, compaction parameters and annealing parameters on properties of soft magnetic composites has been verfied[2-6], and some theoretical works have been studied[7,8]. The conventional Fe-Si-Al (sendust) alloys are known to have several advantages, which include magnetostriction of 0, anisotropy constant of 0, higher electrical resistance, high permeability and lower cost[9,10]. The soft magnetic composites fabricated with Fe-Si-Al powder have a higher performance-cost and have a quick rising output all over the world. But few published information can be found about Fe-Si-Al soft magnetic composites.In this study, the effect of shaping pressure, annealing tempreture, magnetic annealing and dielectric content on properties of Fe-Si-Al soft magnetic powder cores was investigated. Through experimental optimization, the optimum process parameters were obtained.