POWDER MAGNETIC CORE, POWDER FOR MAGNETIC CORE AND MANUFACTURING METHOD FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a powder magnetic core having high specific resistance and strength.

SOLUTION: A powder magnetic core comprises a soft magnetic particle, a first coating layer which is formed of heat-hardening silicon resin and covers the surface of the soft magnetic particle, and a second coating layer which is formed of low softening point glass having a lower softening point than the annealing temperature of the soft magnetic particle and covers the surface of the first coating layer, and has high specific resistance and strength. A coating film having a two-layer structure of the first and second coating layers is formed on the surface of the soft magnetic particle constituting the powder magnetic core. These coating layers have a synergistic effect, thereby providing the powder magnetic core having both high specific resistance and high strength.

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