COMPOSITE SOFT MAGNETIC POWDER, METHOD FOR PRODUCING SAME, AND POWDER MAGNETIC CORE USING SAME

摘要

This composite soft magnetic powder comprises a boron nitride microcrystalline powder primarily having an average crystal grain size of 3-15 nm and comprising soft magnetic ferrous core particles, which have an average particle size of 1-100 µm, and a layer, which has boron nitride as the main constituent and covers at least a portion of the surface of the soft magnetic ferrous core particles, the covering layer having an average thickness that is no greater than 6.6% of the average particle size of the soft magnetic ferrous core particles. The composite soft magnetic powder is produced by: (1) mixing an iron nitride powder having an average particle size of 1-100 µm and boron particles having an average particle size of 0.1-10 µm; (2) heat treating the obtained mixed powder at a temperature of 600-850°C in a nitrogen atmosphere; and (3) eliminating the non-magnetic component.