RARE EARTH-IRON-NITROGEN-BASED MAGNET POWDER FOR BOND MAGNET AND ITS PRODUCTION METHOD

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PROBLEM TO BE SOLVED : To provide a method for efficiently producing rare earth-iron-nitrogen-based magnet powder for a bond magnet having excellent thermal stability and high magnetic properties, and to provide rare earth-iron-nitrogen-based magnet powder obtained thereby. SOLUTION : The method for producing rare earth-iron-nitrogen-based magnet powder for a bond magnet is characterized in that rare earth-iron-nitrogen-based magnet coarse powder is subjected to wet pulverization in a phosphoric acid-added organic solvent having a dissolved oxygen content of ≤0.3 mg/l, next, solid-liquid separation is performed, thereafter, the separated fine powder is heated and dried at ≥150°C (as the organic solvent, the one beforehand subjected to bubbling is preferable). Also disclosed is rare earth-iron-nitrogen-based magnet powder for a bond magnet obtained by the production method and whose surface is coated with a phosphate film (the one in which the damping factor of coercive force is ≤4% is preferable). COPYRIGHT : (C)2008, JPO&INPIT