ACTA

Preparation and Characterization of Fe Based Soft Magnetic Composites Coated by SiO₂ Layer Prepared by Stöber Method

P. Slovenský^a, A. Zeleňáková^a, P. Kollár^a, J. Füzer^a, M. Jakubčin^a, M. Fáberová^b
^aInstitute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
^bInstitute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

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Atomised iron powders of two different particle sizes (particle size below 63 μm and 75-100 μm) were coated with an SiO₂ insulating layer by a chemical procedure, also called Stöber's method, and then have been used as the basis material to form a compact Fe/SiO₂ soft magnetic composite (SMC) using warm compaction techniques. It turned out that a more coherent coating was formed on particles sized below 63 μm rather than on those with size between 75 and 100 μm. This observation was confirmed by SEM images, as well as by higher value of electrical resistance of iron-based SMCs with lower Fe particle size. Annealed Fe/SiO₂ SMCs showed an increased of the value of relative initial permeability (from 100 to 120), and a decreased of the value of coercivity (from 480 A/m to 310 A/m).

DOI:10.12693/APhysPolA.137.872
topics: soft magnetic material, composite, powder coating, powder consolidation, magnetic properties