| 摘要 |
PURPOSE: To produce permanent magnet alloy particles for producing a bond permanent magnet by subjecting an alloy melted material cong. rare earth elements, transition elements and boron to inert gas atomizing, subjecting this particles to heating treatment and increasing the intrinsic coercivity thereof. CONSTITUTION: A permanent magnet alloy composed of, by weight, 29.5 to 40% rare earth elements such as Nd, 50 to 70% transition metals such as Fe, and the balance B is melted. The melted material is subjected to inert gas atomizing to form spherical particles with 1 to 1,000μparticle size. The particles are subjected to heating treatment, preferably, at a prescribed temp. of <=750 deg.C for prescribed time to increase the intrinsic coercivity thereof at least to 10,000 Oe. At this time, the density thereof is regulated to substantially full one without executing sintering. Moreover, the heating treatment can be executed at <=700 deg.C in an inert gas current in a rotary furnace or the like. After that, the obtd. particles are separated to produce a discrete particle mass. In this way, the permanent magnet alloy particles having Nd2 Fe14 B hard magnetic phases and suitable for use for producing bonded permanent magnets can be obtd.
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