Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 496, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2019.165937
Keywords
Fe-Si SMCs; IMI layer; gamma-Fe2O3 coating content; Core loss; Saturation magnetization
Funding
- National Natural Science Foundation of China [51674181]
- Key Projects of Hubei Provincial Department of Education [D20151103]
- Natural Science Foundation of Anhui Province [1908085QE190]
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Fe-Si soft magnetic composites (SMCs) coated with novel insulating-magnetic-insulating (IMI) layer were prepared via ball milling Fe-Si/gamma-Fe2O3 powders and subsequent spark plasma sintering (SPS) process. We had investigated the formation mechanism of the IMI layer and optimized the microstructure and magnetic properties of the Fe-Si/IMI SMCs by adjusting the gamma-Fe2O3 coating content. The analysis results showed that the ball milled Fe-Si/gamma-Fe2O3 powders exhibited superior magnetic properties. And gamma-Fe2O3 would react with Si and produced Fe2SiO4 with good insulation at the interface between gamma-Fe2O3 coating layer and Fe-Si alloy particles during SPS process, which finally resulted in the formation of a novel three-shell structure of Fe2SiO4-gamma-Fe2O3-gamma-Fe2O3 (IMI) layer. By controlling the gamma-Fe2O3 coating content from 0.0 wt% to 10.0 wt%, optimized performances such as very low core loss (23.34 mW/cm(3) at 50 kHz), high quality factor (18.4) and saturation magnetization (188.3 emu/g), were obtained when the gamma-Fe2O3 coating content is 5.0 wt%.
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