Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 51, Issue 7, Pages 3418-3429Publisher
SPRINGER
DOI: 10.1007/s11664-022-09602-x
Keywords
FeSiAl; soft magnetic composites; core loss; TiO2; SiO2
Categories
Funding
- Fundamental Research Funds for the Provincial Universities of Zhejiang [GK 209907299001-002, GK209907299001-003]
- Key Research and Development Plan of Zhejiang Province [2020C05014, 2020C01008, 2021C01193]
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The study introduces an inorganic-organic hybrid insulating layer designed for FeSiAl powder, resulting in excellent soft magnetic performance, mechanical strength, and corrosion resistance.
Excellent soft magnetic performance, superior mechanical strength and good corrosion resistance ensures that soft magnetic composites can be applied in practice for a long time. It is difficult for single organic coating or inorganic coating to meet the multifunctional requirements of a high-performance magnetic core. In this work, inorganic-organic hybrid insulating layers have been designed, which integrates the complementarity of the single type of insulating materials. After 700 degrees C annealing, FeSiAl cores (outer diameter x inner diameter x height= 33.02 x 19.94 x 10.67 mm) deliver a core loss as low as 118.9 mW/cm(3) and effective permeability as high as 61.6 at 50 mT and 100 kHz, which is due to the synergistic insulation of the SiO2 layer, TiO2 layer and SiO2-TiO2 hybrid layer on the surface of FeSiAl powder. Furthermore, crush strength is up to 1012.5 N, which may be ascribed to the SiO2-TiO2 hybrid layer. FeSiAl cores display excellent corrosion resistance activity with a maximum polarization resistance of 25,830.86 omega cm(-2). The inorganic-organic hybrid insulating layer has implications for obtaining soft magnetic powder cores with high mechanical strength, low core loss and good corrosion resistance.
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