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晶界绝缘Fe/MnZnFeO软磁复合材料的微观结构与磁性能

Microstructure and Magnetic Properties of Grain Boundary Insulated Fe/MnZnFeO Soft Magnetic Composites.

作者信息

Yan Liang, Yan Biao, Peng Lei

机构信息

School of Intelligent Manufacturing and Control Engineering, Shanghai Polytechnic University, Shanghai 201209, China.

School of Material Science and Engineering, Tongji University, Shanghai 201209, China.

出版信息

Materials (Basel). 2022 Mar 2;15(5):1859. doi: 10.3390/ma15051859.

DOI:10.3390/ma15051859
PMID:35269090
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8911620/
Abstract

MnZnFeO nano-powder was coated on Fe microparticles by mechanical ball milling combined with high-temperature annealing. The effects of milling time on the particle size, phase structure and magnetic properties of core-shell powder were studied. Scanning electron microscopy (SEM), energy-dispersive spectroscopy and X-ray diffraction showed that the surface of the milled composite powder was composed of thin layers of uniform MnZnFeO insulating powder. SEM also revealed a cell structure of Fe particles, indicating that the Fe particles were well separated and isolated by the thin MnZnFeO layers. Then, Fe/MnZnFeO soft magnetic composites were prepared by spark plasma sintering. The amplitude permeability of Fe/MnZnFeO SMCs in the Fe/MnZnFeO soft magnetic composites was stable. The resistivity decreased with the increase in sintering temperature. The loss of the composite core was obviously less than that of the iron powder core. Hence, the preparation method of MnZnFeO insulating iron powder is promising for reducing core loss and improving the magnetic properties of soft magnetic composites.

摘要

通过机械球磨结合高温退火的方法，将锰锌铁氧体纳米粉末包覆在铁微粒上。研究了球磨时间对核壳粉末的粒径、相结构和磁性能的影响。扫描电子显微镜（SEM）、能谱分析和X射线衍射表明，球磨后的复合粉末表面由均匀的锰锌铁氧体绝缘粉末薄层组成。SEM还揭示了铁颗粒的胞状结构，表明铁颗粒被薄的锰锌铁氧体层很好地分离和隔离。然后，通过放电等离子烧结制备了铁/锰锌铁氧体软磁复合材料。铁/锰锌铁氧体软磁复合材料中，铁/锰锌铁氧体软磁复合材料的幅值磁导率稳定。电阻率随烧结温度的升高而降低。复合磁芯的损耗明显小于铁粉磁芯。因此，锰锌铁氧体绝缘铁粉的制备方法在降低磁芯损耗和改善软磁复合材料磁性能方面具有广阔的前景。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d9e3/8911620/3565794941f3/materials-15-01859-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d9e3/8911620/380d67570449/materials-15-01859-g012.jpg
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