| 摘要 |
PROBLEM TO BE SOLVED: To provide an iron-based alloy permanent magnet powder improved in filling property and fluidity at molding by making the shape of particles from flat shape into a spherical slope. SOLUTION: When the fusion of a Fe-R-B-based alloy is cooled by a single- roll process, a roll surface speed is adjusted to form a quenched solidified alloy of thickness 80 μm to 300 μm. Next, the quench solidified alloy is crystallized by thermal processing, and an alloy thin band 10 having permanent magnet characteristics is formed. Then, the alloy thin band 10 is pulverized, thereby forming powders 11, in which a mean particle size is 50 nm to 300 μm and a size ratio of a short axis direction to a long axis direction, is in the range of 0.3 to 1.0. |
