Abstract
Fe-based amorphous alloy has excellent soft magnetic properties; traditionally, Fe-based amorphous alloy such as soft magnetic devices was fabricated by insulation enveloping and suppression molding methods. In this process, the aging of organic envelope materials and the crystallization of Fe-based amorphous alloy were usually occurring, accompanying with low magnetic induction and poor mechanical properties. The direct ink writing (DIW) technique can make complex-shaped parts and needs no heating treatment after forming, which can avoid the effect of traditional molding process. In the present study, varying mass fraction FeSiB/EP composite parts were prepared by the DIW technique with the Fe-based amorphous alloy powder and epoxy resin, in which microscopic morphology, magnetic properties, and mechanical properties of FeSiB/EP soft magnetic composites were studied. The results indicate that the slurry with iron powder mass fraction of 92.3, 92.6, and 92.8 wt% has good printing performance and self-support ability, which is suitable for DIW. The density of the printed parts is about 4.317, 4.449, and 4.537 g/cm3, which is almost similar with the iron powder. The tensile strength and elongation of printing parts are significantly improved compared with the pure epoxy resin. From the photos of microscopic morphology of printing parts, it can be seen that FeSiB powders are evenly dispersed in EP, no pores, and defects, with the proportion increasing of powders; the insulation coating thickness decreases; and the magnetic performance improves. The optimal sample is 92.8 wt% FeSiB/EP, in which saturation magnetic induction strength is 137.9759 emu/g and coercivity is 4.6523 A/m.
Highlights
Soft magnetic composites (SMCs) were composed of ferromagnetic phase and insulation coating; the ferromagnetic phase was embedded in an insulating matrix (Shokrollahi and Janghorban,2007)
As the shear stress increased, the two curves intersected, the intersection was yield stress point of the slurry, and the yield stress increased with the growing of iron powder content
Different mass ratios of 3D printing slurry were configured with iron-based amorphous alloy powder and epoxy resin (ER)
Summary
Soft magnetic composites (SMCs) were composed of ferromagnetic phase and insulation coating; the ferromagnetic phase was embedded in an insulating matrix (Shokrollahi and Janghorban,2007). Soft Magnetic Properties by Direct Ink Writing magnetic anisotropy caused by crystal structure, and its curie point was much lower than crystal soft magnetic material; it could greatly reduce eddy currents and diminish their total energy losses (Wang et al, 2016). As it is well known, limited by the ability of amorphous formation, Fe-based amorphous alloy was usually in powder form, so the powder metallurgy method was used to make soft magnetic device, but the possible crystallization in post-processing was an inevitable defect of this processing method (Luo et al, 2021; Vijayakumar et al, 2021)
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