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FeSiCr@NiZn SMCs with ultra-low core losses, high resistivity for high frequency applications.
- Source :
-
Journal of Alloys & Compounds . Jul2020, Vol. 830, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Soft magnetic composites (SMCs) are widely applied in electronic devices and components, such as inductors, as they possess the highly-saturated magnetization M s of metallic materials and the highly-insulating characteristics of non-metals. However, with the development of electronic systems that require high-frequency operation, high-energy-transfer efficiency, and miniaturization, the suppression of core losses P cv in their SMCs remains a considerable challenge. Herein, we explore ways to improve the frequency dependence of core losses by using various concentrations of NiZn ferrite (0.0–5.0 wt%) to coat FeSiCr magnetic powders. The microstructural, magnetic, dielectric, and core loss performances of FeSiCr@NiZn SMCs are investigated in detail. Energy dispersive X-Ray spectroscopy (EDS) mapping confirmed that the FeSiCr magnetic powders were able to be well coated with NiZn ferrite. Core loss separation method was utilized to calculate hysteresis losses P h and eddy current losses P e from 25 to 800 kHz at 10 mT and 25 °C. With increasing NiZn ferrite concentration, both P cv and P h initially decreased and subsequently increased, while P e decreased monotonically. The sample with 3.0 wt% NiZn ferrite had the best overall performance: saturation magnetization M s = 157 emu/g, coercive force H c = 4.6 Oe, effective permeability μ e = 60, resistivity ρ = 1.25 × 104 Ω∙m, and core losses P cv = 38 mW/cm3 (at 800 kHz, 10 mT, and 25 °C). The excellent electromagnetic properties of these novel FeSiCr@NiZn SMCs give them enormous application potential in the fields of power transmission and conversion. • EDS mapping confirmed that the FeSiCr powders were well coated with NiZn ferrite. • The high-resistance layer of NiZn ferrite are beneficial for the reduction of P cv. • FSC0NZ possessed optimum P cv = 38 mW/cm3 (at 800 kHz, 10 mT, and 25 °C). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 830
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 142669013
- Full Text :
- https://doi.org/10.1016/j.jallcom.2020.154736