The Influence of Sintering Temperature on Microstructure and Magnetic Properties of Fe/Fe3O4 Powder Cores Fabricated by Spark Plasma Sintering
Composite powders made from 90wt%Fe and 10wt%Fe3O4 were fabricated by dry-type ball milling.The resultant composite powders were consolidated to magnetic powder cores by spark plasma sintering(SPS)at temperatures of 600-850oC.The effect of sintering temperatures on microstructure,density and magnetic properties were investigated together with the densification process of the composite compacts.The temperature effect on microstructure and magnetic properties of Fe/Fe3O4 powder cores were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and B-H analyzer.The densification process of the compact can be indirectly measured by recording the movement of the upper punch which reflects the change in the thickness of the compact.The experimental results indicated that Fe/Fe3O4 powder core sintered at 700oC exhibited excellent soft magnetic properties: Bs=1.5 T(measured at 40000 A/m),Hc=20 Oe,μm=223.The cellular-structured composite powder cores display much lower core loss(367 W/kg(P50mT/100kHz))than that of the Fe raw powder cores without Fe3O4 additions(3086 W/kg(P50mT/100kHz)).Core losses decreased to nearly 1/10 of those of Fe powder core due to the insulation effect of Fe3O4 particles,which significantly expands its applicable frequency ranges.Overall,this work provided great potential for realizing low core loss and outstanding soft magnetic properties of Fe-based powder cores.
Spark Plasma Sintering Soft Magnetic Composite Microstructure Sintering Temperature Insulation
Xie Yuye Yan Biao
School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials,Shanghai 201804,China
国际会议
北京
英文
1372-1377
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）