Fabrication and Properties of Iron-based Soft Magnetic Composites Coated with NiZnFe2O4
WU Shen1, FAN Jiang-lei1, LIU Jian-xiu1, GAO Hong-xia1, SUN Ai-zhi2
1. School of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：This paper focuses on iron-based soft magnetic composites which were synthesized by utilizing the sol-gel method prepared Ni-Zn ferrite particles as insulating compound to coat iron powder, and the influence of NiZnFe2O4 content and molding pressure on the magnetic properties was studied. The morphology, magnetic properties and density of Ni-Zn ferrite insulated compacts were investigated. Scanning electron microscope,line-scan EDX analysis and distribution maps show that the iron particle surface is covered with a thin layer of uniform Ni-Zn ferrites. The existing of the insulating layer can effectively improve the electrical resistivity of soft magnetic composites. Magnetic measurements show that the real part of permeability decreases with the increase of the Ni-Zn ferrite content, and the sample with 3%(mass fraction, the same below) Ni-Zn ferrite has an acceptable real part and minimum imaginary part of permeability in comparison with other samples. Results show that the addition of NiZnFe2O4 can dramatically decrease the internal magnetic loss, the magnetic loss of coated samples decreases by 83.8% as compared with that of uncoated samples at 100kHz. The density of the Fe-3%NiZnFe2O4 compacts reaches 7.14g/cm3 and the saturation magnetization is 1.47T when the molding pressure is 1000MPa.
吴深, 樊江磊, 刘建秀, 高红霞, 孙爱芝. NiZnFe2O4包覆铁基软磁复合材料的制备及性能[J]. 材料工程, 2017, 45(7): 60-65.
WU Shen, FAN Jiang-lei, LIU Jian-xiu, GAO Hong-xia, SUN Ai-zhi. Fabrication and Properties of Iron-based Soft Magnetic Composites Coated with NiZnFe2O4. Journal of Materials Engineering, 2017, 45(7): 60-65.
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