Effect of processing parameters on electrical, mechanical and magnetic properties of iron–resin soft magnetic composite

Abstract

In the present paper, a practical thermal treatment process has been introduced to stress relieve the iron powders in a soft magnetic composite. The composites were pressed and treated at different pressures and temperatures. Also, some of the samples were treated for various periods of time at 200uC. Density, electrical resistivity and transverse rupture strength of the samples were measured and fracture surfaces were studied by SEM. A series of tests were performed to determine the DC magnetic properties of the samples. It has been shown that there are optimum amounts of resin content and compaction pressure and temperature, rather than time is the dominant factor in stress relief of the iron powders.

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

“…According to equation (2), the coercivity of Fe-Si-Al magnetic powder cores was decreased by increasing shaping pressure. Generally, the high coercivity can induce the high loss for soft magnetic material [4]. So, total loss and coercivity present similar trend with increasing shaping pressure.…”

“…For SMCs spencimens made by powder metallurgy processes, pores were stress concentration centers and higher porosity (lower density) decreased the mechanical strength of specimens. By increasing shaping pressure, the porosity can be decreased and RCS can be improved [4]. Fig.3 shows the metallographic photos of Fe-Si-Al magnetic powder cores in different shaping pressure.…”

“…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][3][4][5][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].…”

Low loss Sendust powder cores comprised of particles coated by sodium salt insulating layer

“…[2][3][4][5] In recent years, the effect of particle size, magnetic particle content, compaction parameters, and annealing conditions on soft magnetic properties of composites has been widely investigated in both experiment and theory. [6][7][8][9][10] It is also well known that 4%-6% Al in the binary Fe-Si alloys significantly improves soft magnetic properties 11,12 since the magnetocrystalline anisotropy and magnetostriction become nearly zero at these alloys. This discovery leads to a series of alloys that are collectively know as Sendust.…”

Determination Of Power Loss In Fe-Based Soft Magnetic Composites

“…The main feature of these materials is that iron particles are insulated by a thin organic or inorganic coating. SMCs offer several advantages over laminated steel sheets, for example isotropic magnetic properties, the opportunity to tailor their physical properties to requirements, very low eddy current loss, relatively high resistivity and high magnetic permeability [4,5].…”