| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth magnet having a high electric resistance in which lowering of magnet characteristics is minimized, and to provide its production process.SOLUTION : Surface of magnetic powder for rare earth magnet is coated partially, more preferably entirely, with an amorphous or/and crystalline rare earth oxide represented by general formula (I) and impurities contained in the rare earth oxide are oxidized and removed using a peroxide composed of one or a plurality of kinds of perhalogenide, halogenide, halogenite, hypohalogenite, nitrate, organic peroxide and peroxodisulfuric acid before a rare earth magnet is produced by compression molding. The general formula (I) : R2O3 (where R is terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thorium (Tm), ytterbium (Yb) or lutetium (Lu)). |
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