Magnetic Properties of Iron-based Soft Magnetic Composites with ZrO2 Coating Obtained by Sol-gel Method
The Zirconia sol was obtained using zirconyl chloride as a precursor.Fe particles were coated with ZrO2 using a sol-gel method and subsequently calcinated at 650℃ for 2 h.The effect of coating process and addition amount of Zirconia sol on the magnetic properties of the Fe/ZrO2 composites was investigated.Scanning electron microscopy(SEM)and energy-dispersive spectroscopy(EDS)revealed that the surfaces of iron powders contain a thin ZrO2 insulation layer.X-ray diffraction(XRD)pattern showed the crystal phase of ZrO2 prepared by sol-gel method was monoclinic.Vibrating sample magnetometer(VSM)and soft magnetic AC measuring instrument were uesd to measure the magnetic properties of the powders and the toroidal-shaped samples respectively.Magnetic measurements indicated that coating process could decrease Ms of powders slightly and improve the real part of permeability of samples at medium and high frequencies obviously.Furthermore,the core loss of the sample decreased dramatically after coating.The Fe/ZrO2 composites displayed much lower imaginary part of permeability than those of the pure Fe powder cores without ZrO2 insulation layers at medium and high frequencies.Samples with different ZrO2 content exhibited different magnetic properties.The sample coated with 3 wt%ZrO2 showed relatively low imaginary part of permeability,core loss and an acceptable real part of permeability.
Soft magnetic composites Sol-gel Insulation coating Core loss
Hou Zhenguo Yan Biao
School of Materials Science and Engineering,Tongji University,Shanghai,China;Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials,Shanghai,China
国际会议
北京
英文
1522-1526
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）