Polydopamine/polyethyleneimine enhanced Fe-based amorphous powder cores with improved magnetic properties
Huang Y. 1Zang B. 1Zhang C. 1Xiang M. 1Xiao P. 1Huo J. 1Gao M. 1Ji M. 1Yao B. 1Zhang Y. 1Wang J. 1Umetsu R. 2Wang Y.3
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作者信息
1. Institute of Materials Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences
2. Institute for Materials Research Tohoku University
3. School of Physics Science and Technology Northwestern Polytechnical University
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Abstract
? 2022 Elsevier B.V.Coating soft magnetic powders by an insulation layer is an effective way to improve the high-frequency performance of soft magnetic powder cores. The quality of insulation coating is highly dependent of the coating materials and the coating method. In the present work, a commercial amorphous powder (Fe73Si11B11C3Cr2) was primarily coated by a PDA/PEI layer by a co-deposition method in alkaline solution. A thick PDA/PEI layer with good homogeneity was co-deposited on the surface of amorphous soft magnetic powders. The high frequency core loss of magnetic powder cores was reduced by up to ~ 44 % at the magnetic induction of 0.1 T and the frequency of 100 kHz by primarily coating the amorphous powders by PDA/PEI. Microscopic images showed that the PDA/PEI coating layer on the amorphous powders does not peel off while being compressed. These results indicates that PDA/PEI insulation coating is a coating method which can effectively improve the comprehensive magnetic properties of magnetic powder cores.
Key words
Amorphous/Cross-linked 3-D network structure/High frequency/Insulation coating/Peel/Polydopamine/polyethyleneimine (PDA/PEI)/Powder core/Soft magnetic property
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