Enhanced magnetic properties of iron-based soft magnetic composites with phosphate-polyimide insulating layer

被引:52
作者
Chen, Yan [1 ]
Zhang, Lin [1 ]
Sun, Haishen [1 ]
Chen, Fangfang [1 ]
Zhang, Peng [1 ]
Qu, Xuanhui [1 ]
Fan, Endian [1 ]
机构
[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Iron-based soft magnetic composites; Phosphoric acid; Polyimide; Maximum permeability; Eddy current loss; Corrosion resistance; POWER LOSS SEPARATION; FE; COATINGS; POWDER;
D O I
10.1016/j.jallcom.2019.152205
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Iron-based soft magnetic composites with phosphate-polyimide (PI) insulating layer were successfully fabricated by phosphating and imidization. The effect of phosphoric acid content on microstructure and compressibility of iron powder, and magnetic properties of the cores were investigated. The results demonstrate that the inner inorganic coated layer mainly consists of iron phosphate and ferrous phosphate. With increasing phosphoric acid content, the thickness of phosphate increases gradually, resulting in the reduction of density, maximum permeability and magnetic induction intensity. When the content of phosphoric acid reaches above 0.3 wt%, the bonding strength between the PI coating and iron particles is reduced, leading to the breakage of insulating layer and the augment of core loss. Owing to the excellent thermal stability of PI, magnetic powder cores can be cured at the temperature up to 400 degrees C. The sample coated with 0.1 wt% phosphoric acid and 1.5 wt% PI exhibits excellent magnetic properties. The maximum permeability reaches 201.4, and the core loss (186.6 mW/g) is less than 15% of monolayer phosphate coated sample (measured at 50 mT and 100 kHz). Additionally, the corrosion resistance of the sample is significantly improved. (C) 2019 Elsevier B.V. All rights reserved.
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页数:10
相关论文
共 22 条
[1]   Structure and magnetic properties of ZrO2-coated Fe powders and Fe/ZrO2 soft magnetic composites [J].
Geng, Kaijie ;
Xie, Yuye ;
Xu, Lili ;
Yan, Biao .
ADVANCED POWDER TECHNOLOGY, 2017, 28 (09) :2015-2022
[2]   Iron-borosilicate soft magnetic composites: The correlation between processing parameters and magnetic properties for high frequency applications [J].
Gheiratmand, T. ;
Hosseini, H. R. Madaah ;
Reihani, S. M. Seyed .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2017, 429 :241-250
[3]   Phosphoric acid addition effect on the microstructure and magnetic properties of iron-based soft magnetic composites [J].
Hsiang, Hsing-I ;
Fan, Liang-Fang ;
Hung, Jia-Jing .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2018, 447 :1-8
[4]   Evolution of phosphate coatings during high-temperature annealing and its influence on the Fe and FeSiAl soft magnetic composites [J].
Huang, Maoqin ;
Wu, Chen ;
Jiang, Yinzhu ;
Yan, Mi .
JOURNAL OF ALLOYS AND COMPOUNDS, 2015, 644 :124-130
[5]   Power loss separation in Fe-based composite materials [J].
Kollar, Peter ;
Bircakova, Zuzana ;
Fuezer, Jan ;
Bures, Radovan ;
Faberova, Maria .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2013, 327 :146-150
[6]   AC Magnetic Properties of Fe-Based Composite Materials [J].
Kollar, Peter ;
Fuzer, Ja ;
Bures, Radovan ;
Faberova, Maria .
IEEE TRANSACTIONS ON MAGNETICS, 2010, 46 (02) :467-470
[7]   The preparation and magnetic performance of the iron-based soft magnetic composites with the Fe@Fe3O4 powder of in situ surface oxidation [J].
Li, Jingxin ;
Yu, Jing ;
Li, Wangchang ;
Che, Shenglei ;
Zheng, Jingwu ;
Qiao, Liang ;
Ying, Yao .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2018, 454 :103-109
[8]   Correlating the microstructure, growth mechanism and magnetic properties of FeSiAl soft magnetic composites fabricated via HNO3 oxidation [J].
Liu, Dong ;
Wu, Chen ;
Yan, Mi ;
Wang, Jian .
ACTA MATERIALIA, 2018, 146 :294-303
[9]   Investigation on sol-gel Al2O3 and hybrid phosphate-alumina insulation coatings for FeSiAl soft magnetic composites [J].
Liu, Dong ;
Wu, Chen ;
Yan, Mi .
JOURNAL OF MATERIALS SCIENCE, 2015, 50 (20) :6559-6566
[10]  
Pang YX, 2006, J MATER SCI, V41, P5926, DOI 10.1007/s10853-006-0360-0