R-t-b based permanent magnet
    2.
    发明专利

    公开(公告)号:JP5501833B2

    公开(公告)日:2014-05-28

    申请号:JP2010084392

    申请日:2010-03-31

    摘要: PROBLEM TO BE SOLVED: To provide an R-T-B based permanent magnet having superio magnetization characteristics.SOLUTION: An organic metal compound solution doped with an organic metal compound represented by M-(OR)(wherein M contains at least one kind of Al, Cu, Zr, Nb, Hf and Co, R is any one of 2-6C alkyl groups and may be a straight chain or a branched chain, and x is an arbitrary integer) is doped to a fine powder of a pulverized R-T-B based magnet, and the organic metal compound is uniformly deposited to the surface of magnetic particles. After that, a molded body formed by powder compaction is maintained for several hours at 200-900°C in a hydrogen atmosphere to execute temporary baking processing in hydrogen. Then, the resulted product is baked at 800-1,180°C, thereby a permanent magnet 1 is manufactured.

    Method for producing a rare earth sintered magnet

    公开(公告)号:JP5501826B2

    公开(公告)日:2014-05-28

    申请号:JP2010083428

    申请日:2010-03-31

    摘要: 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)(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.