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<p>The warm compaction was employed for producing high performance FeSiBCCr amorphous soft magnetic composites (ASMCs). The effects of compacting temperature (<i>T</i><sub>c</sub>), molding pressure (<i>P</i><sub>m</sub>), pressure holding duration (<i>t</i><sub>h</sub>), and resin content (<i>C</i><sub>r</sub>) on the compaction density (<i>ρ</i><sub>c</sub>) and magnetic properties were investigated. An appropriate increase in the compacting temperature (<i>T</i><sub>c</sub>) enhances the surface lubricity of magnetic powders, thereby facilitating the infiltration of finer particles into the interstitial voids between coarser particles and promoting a more uniform particle size distribution. This improvement ultimately results in a higher compaction density (<i>ρ</i><sub>c</sub>). The magnetic loss separation analysis reveals that hysteresis loss (<i>P</i><sub>h</sub>) is dominated in total core loss (<i>P</i><sub>cv</sub>) between 20 and 200&#xa0;kHz. Under the optimized fabrication parameters of <i>T</i><sub>c</sub> = 140&#xa0;°C, <i>P</i><sub>m</sub> = 300&#xa0;MPa, <i>t</i><sub>h</sub> = 10&#xa0;s, and <i>C</i><sub>r</sub> = 3.0 wt%, the compaction density (<i>ρ</i><sub>c</sub>) of ASMCs is boosted by 5.2% to 5.48&#xa0;g/cm<sup>3</sup>, compared with the samples prepared at room temperature (<i>T</i><sub>c</sub> = 25 ℃). The effective permeability (<i>μ</i><sub>e</sub>) increases by 23.1% to 20.4 at 100&#xa0;kHz; the core loss (<i>P</i><sub>cv</sub>) decreases by 21.4% to 297.0 mW/cm<sup>3</sup> under operating conditions of 100&#xa0;kHz/0.05&#xa0;T; and the percentage of permeability retention (<i>μ</i><sub>e</sub> %) reaches 93.3% at <i>H</i> = 100Oe. This study establishes a robust foundation for the application of amorphous soft magnetic powders in high-frequency molded inductors.</p>

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Amorphous soft magnetic composites with excellent soft magnetic properties prepared by warm compaction

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Ce Wang,
  • Hongya Yu,
  • Yangzhou Li,
  • Haibo Sun,
  • Zhongwu Liu

摘要

The warm compaction was employed for producing high performance FeSiBCCr amorphous soft magnetic composites (ASMCs). The effects of compacting temperature (Tc), molding pressure (Pm), pressure holding duration (th), and resin content (Cr) on the compaction density (ρc) and magnetic properties were investigated. An appropriate increase in the compacting temperature (Tc) enhances the surface lubricity of magnetic powders, thereby facilitating the infiltration of finer particles into the interstitial voids between coarser particles and promoting a more uniform particle size distribution. This improvement ultimately results in a higher compaction density (ρc). The magnetic loss separation analysis reveals that hysteresis loss (Ph) is dominated in total core loss (Pcv) between 20 and 200 kHz. Under the optimized fabrication parameters of Tc = 140 °C, Pm = 300 MPa, th = 10 s, and Cr = 3.0 wt%, the compaction density (ρc) of ASMCs is boosted by 5.2% to 5.48 g/cm3, compared with the samples prepared at room temperature (Tc = 25 ℃). The effective permeability (μe) increases by 23.1% to 20.4 at 100 kHz; the core loss (Pcv) decreases by 21.4% to 297.0 mW/cm3 under operating conditions of 100 kHz/0.05 T; and the percentage of permeability retention (μe %) reaches 93.3% at H = 100Oe. This study establishes a robust foundation for the application of amorphous soft magnetic powders in high-frequency molded inductors.