High permeability and low core loss Fe-based soft magnetic composites with Co-Ba composite ferrite insulation layer obtained by sol-gel method

Zheng, Jingwu ¹Zheng, Danni ¹Qiao, Liang ¹Ying, Yao ¹Tang, Yiping ¹Cai, Wei ¹Li, Wangchang ¹Yu, Jing ¹Li, Juan ¹Che, Shenglei¹

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作者信息

1. Zhejiang Univ Technol
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Abstract

To balance the core loss and permeability of soft magnetic composites (SMCs), a Co-Ba composite ferrite insulation layer was employed to clad the surface of reduced iron powder by sol-gel method. The successful preparation of the honeycomb-like Co-Ba composite ferrite coating layer was verified by scanning electron microscopy (SEM), the composition of the coating was determined by X-ray diffraction (XRD), and the magnetic properties were tested with a B-H curve analyzer. BSEM images of the polished cross-section and core loss separation results confirmed that an excessively high annealing temperature causes the composite ferrite insulation layer to fail. A high effective permeability of up to 121 at 300 kHz and low core loss (P-cv) of 129 kW/m(3) at 100 kHz and 0.02 T were obtained in prepared samples at the optimized annealing temperature of 500 degrees C. Subsequently, simulation analysis based on the Clausius-Maxwell formula model was used to confirm the feasibility of the enhancement on effective permeability in Fe@Co-Ba composite ferrite theoretically. The agreement between simulation and experimental results further indicated that a good balance between the core loss and permeability of Fe-based SMCs was achieved by Co-Ba composite ferrite cladding. (C) 2021 Elsevier B.V. All rights reserved.

Key words

Fe-based soft magnetic composites/Co-Ba composite ferrite/Insulation layer/Permeability calculation/Sol-gel processes/HEAT-TREATMENT/NANOPARTICLES/PARTICLES/COFE2O4

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出版年

2022

Journal of Alloys and Compounds

EISCI

ISSN：0925-8388

被引量22

参考文献量48

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