Fe-based amorphous powder cores with low core loss and high permeability fabricated using the core-shell structured magnetic flaky powders

•High-quality inorganic insulating layer was performed for industrial Fe-based amorphous flaky powders.•FeSiBCCr MFPCs show better magnetic properties and lower raw material cost than the Finemet MFPCs.•The FeSiBCCr MFPCs exhibit higher permeability and lower core loss than conventional FeSiB MFPCs....

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-05, Vol.502, p.166548, Article 166548
Main Authors: Sun, Haibo, Wang, Ce, Wang, Jinghui, Yu, Mingguang, Guo, Zhili
Format: Article
Language:English
Subjects:
Amorphous flaky powders
Annealing
Core loss
Core-shell structure
Ferrous alloys
Fourier transforms
Infrared analysis
Magnetic permeability
Magnetic powder cores
Magnetic properties
Permeability
Silicon dioxide
Soft magnetic properties
Sol-gel method
Sol-gel processes
Spectrum analysis
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Summary:•High-quality inorganic insulating layer was performed for industrial Fe-based amorphous flaky powders.•FeSiBCCr MFPCs show better magnetic properties and lower raw material cost than the Finemet MFPCs.•The FeSiBCCr MFPCs exhibit higher permeability and lower core loss than conventional FeSiB MFPCs.•The FeSiBCCr MFPCs annealed at 773 K for 0.5 h exhibit excellent comprehensive soft magnetic properties. Fe-based amorphous powder cores based on the industrial flaky FeSiBCCr magnetic powders coated with high-quality inorganic (SiO2) insulating layer via a sol-gel method were successfully fabricated to improve the soft magnetic properties of powder cores. The core-shell structure of magnetic flaky powders was characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy analysis, and Fourier transform infrared spectroscopy. The influence of annealing temperature on the soft magnetic properties of the FeSiBCCr magnetic flaky powder cores (MFPCs) has been systematically investigated, and the comparisons were made with the conventional FeSiB and Finemet MFPCs at the same preparation conditions. It was found that the reasonable annealing temperature could enhance the permeability and reduce the core loss for the MFPCs. As compared to the conventional FeSiB MFPCs, the FeSiBCCr MFPCs annealed at 773 K for 0.5 h exhibits a higher permeability of 79.19, and lower core loss of 122.26 mW/m3 at 100 kHz for Bm = 0.05 T. Additionally, the FeSiBCCr MFPCs shows a better DC-bias property of 51.30%, and lower raw material cost than those of the Finemet MFPCs. The excellent comprehensive magnetic properties of the FeSiBCCr MFPCs are favorable for achieving the optimal design of powder cores toward practical applications.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.166548