| 简介 |
PROBLEM TO BE SOLVED : To provide a rare-earth sintered magnet which prevents oxidation of a molded body and absorption of humidity and has high magnetic characteristics by improving its storability, and to provide a method for manufacturing the magnet.
SOLUTION : A fine powder of a pulverized neodymium magnet is recovered into an organic solvent containing an organic metal compound represented by a structural formula M-(OR)x (wherein M contains at least one kind of rare earth elements Nd, Pr, Dy and Tb, R is an arbitrary one among 2-6 C alkyl groups and may be a straight chain or a branched chain, and x is an arnitrary integer) to generate a slurry 42, and after that, a pressure is applied to the slurry 42 injected into a cavity 54 in a state where a magnetic field is applied to mold the slurry in a molding machine 50, and then, the organic solvent is evaporated to obtain a molded body. Next, the molded body is subjected to temporary baking in hydrogen of a hydrogen atmosphere, and is baked at 800-1, 180°C, thereby a permanent magnet is manufactured.
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