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    Rare earth magnet and producing method thereof
    3.
    发明授权
    Rare earth magnet and producing method thereof 有权

    公开(公告)号：US11869690B2

    公开(公告)日：2024-01-09

    申请号：US17578856

    申请日：2022-01-19

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Noritsugu Sakuma ,  Tetsuya Shoji ,  Akihito Kinoshita ,  Akira Kato

    IPC分类号： H01F1/057 ,  H01F41/02 ,  B22F3/24 ,  C22C38/00 ,  C22C38/10

    CPC分类号： H01F1/0577 ,  C22C38/005 ,  C22C38/10 ,  H01F41/0293 ,  C22C2202/02 ,  H01F41/0266

    摘要： A rare earth magnet in which the amount used of a heavy rare earth element is more reduced while maintaining enhancement of the coercive force, and a producing method thereof are provided. The rare earth magnet of the present disclosure has a main phase 10 and a grain boundary phase 20. The main phase 10 has a composition represented by R12T14B. The main phase 10 has a core part 12 and a shell part 14. Denoting the abundances of R2 and Ce (R2 is heavy rare earth element) occupying 4f site of the shell part 14 as R24f and Ce4f, respectively, and denoting the abundances of R2 and Ce occupying 4g site of the shell part 14 as R24g and Ce4g, respectively, the rare earth magnet satisfies 0.44≤R24g/(R24f+R24g)≤0.70 and 0.04≤(Ce4f+Ce4g)/(R24f+R24g). The rare earth magnet-producing method of the present disclosure uses a modifier containing at least R2 and Ce.

    Magnet
    4.
    发明授权
    Magnet 有权

    公开(公告)号：US11810698B2

    公开(公告)日：2023-11-07

    申请号：US15742460

    申请日：2016-06-29

    申请人： Dyson Technology Limited

    发明人： Tuncay Celik

    IPC分类号： H01F1/057 ,  H01F41/02

    CPC分类号： H01F1/0577 ,  H01F41/0293

    摘要： Magnets and systems, methods, and techniques for manufacturing magnets are provided. In some embodiments, methods of manufacturing magnets comprise providing a rare earth magnetic body, depositing a bead of dysprosium or terbium metal onto a part of the magnetic body to form a magnet; and heat-treating the magnet. In some embodiments, a magnet is provided comprising a magnetic body and a bead of dysprosium or terbium metal. In some embodiments, the magnetic body contains grains of rare earth magnet alloy, and the bead of dysprosium or terbium metal is deposited onto a part only of a surface of the magnetic body.

    R-T-B BASED SINTERED MAGNET
    6.
    发明申请
    R-T-B BASED SINTERED MAGNET 审中-公开

    公开(公告)号：US20180286545A1

    公开(公告)日：2018-10-04

    申请号：US15939778

    申请日：2018-03-29

    申请人： TDK CORPORATION

    发明人： Yoshinori FUJIKAWA ,  Masashi MIWA

    IPC分类号： H01F1/057 ,  H01F41/02 ,  C22C38/00

    CPC分类号： H01F1/0577 ,  C22C38/005 ,  H01F41/0293

    摘要： An R-T-B based sintered magnet including a plural number of main phase particles having an R2T14B type crystal structure. R is at least one rare earth element essentially including heavy rare earth elements RH, T is at least one transition metal element essentially including Fe or Fe and Co, and B is boron. At least one of the main phase particles is a reverse core-shell main phase particle including a core part and a shell part, in which CRC/CRS>1.0 is satisfied when a total RH concentration (at %) in the core part is defined as CRC and a total RH concentration (at %) in the shell part is defined as CRS. An existence ratio of the reverse core-shell main phase particles is larger in a surface layer part of the magnet than in a central part of the magnet.

    Fine-Grained ND-FE-B Magnets Having High Coercivity and Energy Density
    7.
    发明申请
    Fine-Grained ND-FE-B Magnets Having High Coercivity and Energy Density 审中-公开

    公开(公告)号：US20180247743A1

    公开(公告)日：2018-08-30

    申请号：US14534758

    申请日：2014-11-06

    申请人： Ford Global Technologies, LLC

    发明人： Wanfeng LI

    IPC分类号： H01F1/057 ,  H01F41/02

    CPC分类号： H01F41/0293 ,  C22C1/02 ,  H01F1/0577

    摘要： Magnets and methods of making the magnets are disclosed. The magnets may have high coercivity and may be suitable for high temperature applications. The magnet may include a plurality of grains of a Nd—Fe—B alloy having a mean grain size of 100 to 500 nm. The magnet may also comprise a non-magnetic low melting point (LMP) alloy, which may include a rare earth element and one or more of Cu, Ga, and Al. The magnets may be formed from a Nd—Fe—B alloy powder produced using HDDR and jet milling, or other pulverization process. The powder may have a refined grain size and a small particle size and particle size distribution. The LMP alloy may be mixed with a powder of the Nd—Fe—B alloy or it may be diffused into a consolidated Nd—Fe—B bulk magnet. The LMP alloy may be concentrated at the grain boundaries of the bulk magnet.