Fe-based amorphous soft magnetic composites with SiO2 insulation coatings: A study on coatings thickness,microstructure and magnetic properties |
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| Affiliation: | 1. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Ningbo Yunsheng Electronic Components Technology Co., Ltd., Ningbo, Zhejiang 315201, China;1. Technical University of Cluj-Napoca, Materials Science and Engineering Department, 103-105, Muncii Avenue, 400641, Cluj-Napoca, Romania;2. Center for Superconductivity, Spintronics and Surface Science, Technical University of Cluj-Napoca, Memorandumului Street, no 28, 400114, Cluj-Napoca, Romania;3. Imperial College London, Exhibition Road, South Kensington, London, SW 7 2AZ, United Kingdom;4. Advanced Development Group Brose Fahrzeugteile GmbH & Co. KG., Wurzburg, Germany;5. Technical University of Cluj-Napoca, Department of Physics and Chemistry, Cluj-Napoca, Romania;6. Institute of Electrical Machines, RWTH Aachen University, Aachen, D-52062, Germany;1. School of Physics Science and Technology, Xinjiang University, Urumqi, Xinjiang 830046, PR China;2. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, PR China;3. Ningbo yunsheng co. ltd, Ningbo, Zhejiang 315201, PR China |
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| Abstract: | Core-shell structured FeSiBCCr@SiO2 amorphous soft magnetic composites (ASMCs) with tunable insulating layer thicknesses have been designed and fabricated by the powder metallurgy method. The growth process of the coatings obtained via the sol-gel method has been systematically studied based on the analysis of the growth mechanism and the insulating layer thicknesses calculated by a modified method. In the powder-coating process using small quantities of tetraethyl orthosilicate (TEOS) (0.025–0.1 mL/g), a relatively uniform insulating layer is formed on the surface of the powders. Increasing the TEOS concentration further (0.25–1 mL/g) greatly enhances the reaction kinetics of the hydrolysis and condensation reactions. Consequently, the SiO2 shells of the amorphous powder rapidly grow in thickness and also generate aggregates. The evolution of the thickness of the coatings under different growth conditions also corresponds to the variation of the magnetic performance of the ASMCs. The ASMCs with an appropriate SiO2 insulating layer exhibit stability at high frequencies and significantly lower the contribution of eddy current to the total loss. Conversely, a thick insulation layer results in a high fraction of the non-magnetic phase and consequently enhances the hysteresis loss. Thus, an enhanced magnetic performance of the FeSiBCCr ASMCs can be achieved by adjusting the TEOS concentration (0.025–0.1 mL/g) or the thickness of the SiO2 insulating layer. |
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| Keywords: | Soft magnetic composites Growth mechanism Coating thickness Core loss |
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