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Atomised iron powders of two different particle sizes (particle size below 63 mu m and 75-100 mu m) were coated with an SiO2 insulating layer by a chemical procedure, also called Stober'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 mu m rather than on those with size between 75 and 100 mu m. 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).

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

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