The enhanced magnetic properties of FeSiCr powder cores composited with carbonyl iron powder

Toroid-shaped Fe-based soft magnetic powder cores (SMPCs) were prepared by cold pressing commercial FeSiCr and carbonyl iron powder (CIP) insulated with epoxy resin. The effect of the CIP mass ratio on the magnetic properties of powder cores, which included the dependences of the effective permeability (mu(e)), DC bias characteristic, and core loss (P-cv), was investigated. By optimizing the CIP content, the mu(e) of the magnetic powder cores reaches 31 when the CIP content is 30 wt%, and it exhibits a stable permeability in the frequency range up to 1 MHz. Meanwhile, the DC bias characteristic increases to 78%, and the P-cv is minimized to 1684 mW/cm(3), which is reduced by 15% at 50 mT and 250 kHz.

Automated summary

Toroid-shaped Fe-based soft magnetic powder cores were prepared by combining commercial FeSiCr and carbonyl iron powder insulated with epoxy resin. The research focused on the impact of CIP mass ratio on magnetic properties, optimizing CIP content to achieve higher effective permeability, stable permeability in a wide frequency range, improved DC bias characteristic, and reduced core loss.