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    R-T-B sintered magnet
    31.
    发明授权
    R-T-B sintered magnet 有权

    公开(公告)号：US09837193B2

    公开(公告)日：2017-12-05

    申请号：US13980133

    申请日：2012-01-19

    申请人： Futoshi Kuniyoshi

    发明人： Futoshi Kuniyoshi

    IPC分类号： H01F1/053 ,  B22F3/24 ,  C22C33/02 ,  C22C38/00 ,  H01F41/02 ,  H01F1/057

    CPC分类号： H01F1/0536 ,  B22F3/24 ,  C22C33/0278 ,  C22C38/00 ,  C22C38/005 ,  H01F1/0577 ,  H01F41/0293

    摘要： This sintered R-T-B based rare-earth magnet includes: R2Fe14B type compound crystal grains, including a light rare-earth element RL (which includes at least one of Nd and Pr) as a major rare-earth element R, as main phases; and a heavy rare-earth element RH (which includes at least one of Dy and Tb). Before its surface region is removed, the sintered R-T-B based rare-earth magnet has no layer including the rare-earth element R at a high concentration in that surface region. The sintered R-T-B based rare-earth magnet has a portion in which coercivity decreases gradually from its surface region toward its core portion. The difference in the amount of TRE between a portion of the sintered R-T-B based rare-earth magnet that reaches a depth of 500 μm as measured from its surface region toward its core portion and the core portion of the sintered R-T-B based rare-earth magnet is 0.1 through 1.0.

    PROCESS FOR PRODUCTION OF R-T-B BASED SINTERED MAGNETS AND R-T-B BASED SINTERED MAGNETS
    32.
    发明申请
    PROCESS FOR PRODUCTION OF R-T-B BASED SINTERED MAGNETS AND R-T-B BASED SINTERED MAGNETS 有权
    生产基于R-T-B的烧结磁体和R-T-B基烧结磁体的方法

    公开(公告)号：US20120112863A1

    公开(公告)日：2012-05-10

    申请号：US13382587

    申请日：2010-07-12

    申请人： Futoshi Kuniyoshi

    发明人： Futoshi Kuniyoshi

    IPC分类号： H01F7/02 ,  B05D3/02 ,  B05D5/00

    CPC分类号： B22F3/24 ,  B22F2003/241 ,  C22C19/07 ,  C22C28/00 ,  C22C33/0278 ,  C22C38/005 ,  C22C2202/02 ,  C22F1/10 ,  C22F1/16 ,  H01F1/0577 ,  H01F41/0293

    摘要： A method for producing a sintered R-T-B based magnet includes the steps of: providing a sintered R-T-B based magnet body 1; providing an RH diffusion source 2 including a metal or an alloy of a heavy rare-earth element RH (which is at least one of Dy an Tb); loading the sintered magnet body 1 and the RH diffusion source 2 into a processing chamber 3 so that the magnet body 1 and the diffusion source 2 are movable relative to each other and brought close to, or in contact with, each other; and performing an RH diffusion process by conducting a heat treatment on the sintered R-T-B based magnet body 1 and the RH diffusion source 2 at a temperature of 500° C. to 850° C. for at least 10 minutes while moving the magnet body 1 and the diffusion source 2 either continuously or discontinuously in the processing chamber 3.

    摘要翻译： 制造R-T-B系烧结磁体的方法包括以下步骤：提供R-T-B系烧结磁体1; 提供包括重稀土元素RH（其为Dy和Tb中的至少一种）的金属或合金的RH扩散源2; 将烧结磁体1和RH扩散源2加载到处理室3中，使得磁体1和扩散源2相对于彼此可移动并且彼此接近或接触; 并且通过在温度为500℃至850℃的温度下在基于RTB的磁体1和RH扩散源2上进行热处理至少10分钟进行RH扩散处理，同时移动磁体1和 扩散源2在处理室3中连续地或不连续地。

    ALLOY FOR SINTERED R-T-B-M MAGNET AND METHOD FOR PRODUCING SAME
    33.
    发明申请
    ALLOY FOR SINTERED R-T-B-M MAGNET AND METHOD FOR PRODUCING SAME 有权
    用于烧结R-T-B-M磁铁的合金及其制造方法

    公开(公告)号：US20120032764A1

    公开(公告)日：2012-02-09

    申请号：US13260755

    申请日：2010-03-29

    申请人： Futoshi Kuniyoshi

    发明人： Futoshi Kuniyoshi

    IPC分类号： H01F7/02 ,  C21D8/00 ,  B22F3/12 ,  B22F1/00 ,  C21D6/00

    CPC分类号： H01F41/0266 ,  C22C1/0441 ,  C22C2202/02 ,  H01F1/0577

    摘要： In order to make a sintered R-T-B-M magnet so that R2T14B phases that include a lot of Dy in the surface region of the main phase are distributed over the entire magnet, a region including a heavy rare-earth element RH at a high concentration is formed continuously beforehand at an interface between the crystals of an R2T14B compound that is the main phase of the sintered R-T-B-M magnet and the other phases.

    摘要翻译： 为了制造烧结的RTBM磁体，使得在主相的表面区域中包含大量Dy的R2T14B相分布在整个磁体上，连续地形成包括高浓度的重稀土元素RH的区域 预先在作为烧结RTBM磁体的主相的R2T14B化合物的晶体与其它相之间的界面处。