RARE EARTH ELEMENT MAGNET POWDER AND ITS SURFACE TREATING METHOD

PROBLEM TO BE SOLVED : To provide a novel rare earth element magnet powder with which a rare earth element bond magnet having proper corrosion resistance is manufactured, using a phosphoric acid and a metallic compound, and also to provide a surface treating method and a bond magnet using the surface treated rare earth element magnet powder. SOLUTION : The method for surface treating the rare earth element magnet powder includes the steps of : manufacturing a slurry in which the rare earth element magnet is dispersed in an organic solvent; adding a phosphoric acid into the slurry, adding the metallic compound into the slurry; and heating the slurry at 50-300°C in vacuum or inert gas atmosphere.