Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO₂ insulation layer.

ABSTRACT: FeNiMo/SiO₂ powder cores were prepared using the sol-gel method. Tetraethyl orthosilicate (TEOS) was added to produce an amorphous SiO₂ coating outside the FeNiMo particles to form a core-shell structure. The thickness of the SiO₂ layer was designed by varying the concentration of TEOS, and the optimized permeability and magnetic loss of the powder core could achieve 78.15 and 633.44 kW m^-3 at 100 kHz and 100 mT, respectively. Compared with other soft magnetic composites, these FeNiMo/SiO₂ powder cores have a significantly higher effective permeability and a lower core loss. Surprisingly, the high-frequency stability of permeability could be substantially enhanced through the insulation coating process in which μ_f/

SUBMITTER: Lai J 

PROVIDER: S-EPMC10214003 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature