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<p>To overcome the shortcomings of traditional single organic or inorganic coating layers, a hybrid coating layer is used to improve the performance of soft magnetic composites (SMCs). In this study, the FeSi powders was coated by phosphate and epoxy-modified organic silicon resin (ESR) hybrid insulating layer and the influences of phosphoric acid and ESR content on microstructure and magnetic properties of soft magnetic composites were investigated. The reasonable phosphoric acid and ESR coating treatment form a homogeneous insulating layer on magnetic particles and then effectively decrease the core loss of the SMCs. Excess thick coating results in rupture or aggregation of insulation layer, which increases the eddy loss and hysteresis loss. The optimized magnetic properties were obtained from the composite with 0.5&#xa0;wt% phosphoric acid and 2&#xa0;wt% ESR coating, the permeability achieves 50 and the core loss declines to 467.13&#xa0;kW/m<sup>3</sup> (40&#xa0;mT and 200&#xa0;kHz), the DC bias performance is higher than 65% at 100&#xa0;Oe.</p>

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Magnetic properties of FeSi soft magnetic composites optimized by phosphate and epoxy-modified organic silicon resin hybrid insulation

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Lirong Dai,
  • Nan Qiu,
  • Kun Peng

摘要

To overcome the shortcomings of traditional single organic or inorganic coating layers, a hybrid coating layer is used to improve the performance of soft magnetic composites (SMCs). In this study, the FeSi powders was coated by phosphate and epoxy-modified organic silicon resin (ESR) hybrid insulating layer and the influences of phosphoric acid and ESR content on microstructure and magnetic properties of soft magnetic composites were investigated. The reasonable phosphoric acid and ESR coating treatment form a homogeneous insulating layer on magnetic particles and then effectively decrease the core loss of the SMCs. Excess thick coating results in rupture or aggregation of insulation layer, which increases the eddy loss and hysteresis loss. The optimized magnetic properties were obtained from the composite with 0.5 wt% phosphoric acid and 2 wt% ESR coating, the permeability achieves 50 and the core loss declines to 467.13 kW/m3 (40 mT and 200 kHz), the DC bias performance is higher than 65% at 100 Oe.