Study of amorphous powder cores with increased magnetic saturation and permeability

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-02-27 DOI:10.1016/j.powtec.2025.120847

Ángel Sota Muñoz , Nerea Burgos , Valentina Zhukova , Ahmed Talaat , Julián González , Mikel Osinalde , Jose Manuel Martín

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Abstract

Soft magnetic composites (SMCs) made of amorphous powder typically result in low densities due to the brittleness of the amorphous, thereby providing poor magnetic properties. For this reason, this work focuses on mixing the particle sizes of amorphous powders to increase the packing, and therefore the compact density and magnetic properties. Enhanced packing density is obtained by mixing particle size fractions of 20–45 μm and 0–10 μm in a proportion of 73:27 vol%, respectively. Properties of the SMC made from the mixed fractions are compared with those made from each fraction using an Fe-Co composition ((Fe_0.425 Co_0.30 Si_0.125 B_0.15)_96.5Nb₃Cu_0.5). The mixing of fractions shows an increase of 10 % in density, thus reducing interparticle voids and enhancing magnetic saturation and permeability. By contrast, lower power losses are provided by the SMC fabricated with the 0–10 μm fraction due to lower eddy currents. A comparative study on magnetic properties and power losses of SMCs made from the mixed fractions for four compositions reveal that highest permeability (μ’ = 34.5) is achieved with composition (Fe_0.46 Co_0.30 Si_0.09 B_0.10 P_0.05)_96.5Nb₃Cu_0.5 and lowest power losses at high frequency (3437 mW/cm³ at 1 MHz and B = 50 mT) with Fe_72.5 Si_12.5 B₁₅ after annealing and subsequent resin infiltration.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.