Effects of the Addition of Permalloy Powder on the High-Frequency Magnetic Properties of Fe-Based Amorphous Powder Cores

摘要

FeSiB amorphous powder was produced by gas atomization, and subsequently toroidal-shaped FeSiB amorphous powder cores were prepared by cold pressing, using permalloy powder as an additive. The characteristics of gas-atomized FeSiB amorphous powder and high-frequency magnetic properties of the cores were investigated. FeSiB amorphous powder, exhibiting good soft magnetic properties with a saturation magnetization of 125 emu/g and a coercivity of 0.4 Oe, was successfully produced by gas atomization in the particle size range below 75$mu$m. The addition of permalloy powder was effective for compaction of FeSiB amorphous powder cores by cold pressing. Permalloy powder increases the effective permeability of the cores but deteriorates the high-frequency dependence of the permeability at high content.