RARE EARTH-IRON BASED MAGNET ALLOY POWDER, ITS PRODUCTION METHOD, COMPOSITION FOR RESIN BONDED MAG

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PROBLEM TO BE SOLVED : To provide a method capable of efficiently producing a rare earth-iron based magnet alloy powder having excellent weatherability and high magnetic properties; to provide the resultant rare earth-iron based magnet alloy powder; to provide a composition for a resin-bonded magnet using the same; and to provide a resin-bonded magnet.SOLUTION : In the method for producing a rare earth-iron based magnet alloy powder, a rare earth-iron based magnet alloy coarse powder is subjected to wet grinding in an organic solvent admixed with phosphoric acid, and is then subjected to solid-liquid separation, so as to prepare a magnet alloy powder cake having a liquid content of 5 to 30 wt.%; thereafter, the resultant magnet alloy powder cake is successively heated and dried at 150 to 200°C as air is exhausted under the condition where the exhaust rate (liter/min×kg) per unit weight reaches ≥4.COPYRIGHT : (C)2007, JPO&INPIT