| 摘要 |
<p>A composite, soft-magnetic powder comprising soft-magnetic, iron-based core particles having an average particle size of 2-100 µm, and boron nitride-based coating layers each covering at least part of each soft-magnetic, iron-based core particle, said coating layers being polycrystalline layers comprising fine boron nitride crystal grains having different crystal orientations and an average crystal grain size of 3-15 nm, the average thickness of said polycrystalline layers being 6.6% or less of the average particle size of said soft-magnetic, iron-based core particles, is produced by (1) mixing iron nitride powder having an average particle size of 2-100 µm with boron powder having an average particle size of 0.1-10 µm, (2) heat-treating the resultant mixed powder at a temperature of 600-850°C in a nitrogen atmosphere, and (3) removing non-magnetic components.</p> |
