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    MAGNET STRUCTURE
    1.
    发明申请
    MAGNET STRUCTURE 有权

    公开(公告)号：US20210280345A1

    公开(公告)日：2021-09-09

    申请号：US17186770

    申请日：2021-02-26

    Applicant: TDK Corporation

    Inventor： Taeko TSUBOKURA ,  Toshihiro KUROSHIMA ,  Koji MITAKE ,  Takeshi MASUDA

    IPC: H01F1/057 ,  H01F41/02

    Abstract: A magnet structure includes a first sintered magnet, a second sintered magnet, and an intermediate layer disposed between the first sintered magnet and the second sintered magnet. Each of the first sintered magnet and the second sintered magnet independently includes crystal grains containing a rare earth element, a transition metal element, and boron. The intermediate layer contains rare earth element oxide phases and crystal grains containing a rare earth element, transition metal element, and boron. Each of the transition metal elements independently includes Fe or a combination of Fe and Co. An average coverage factor of the rare earth element oxide phases measured on the basis of a cross section perpendicular to the intermediate layer of the magnet structure is within a range of 10% to 69%.

    R-T-B PERMANENT MAGNET
    2.
    发明申请
    R-T-B PERMANENT MAGNET 审中-公开

    公开(公告)号：US20200176155A1

    公开(公告)日：2020-06-04

    申请号：US16698019

    申请日：2019-11-27

    Applicant: TDK Corporation

    Inventor： Takeshi MASUDA ,  Taeko TSUBOKURA ,  Taku MURASE

    IPC: H01F1/057 ,  C22C38/16 ,  C22C38/14 ,  C22C38/06 ,  C22C38/00 ,  C22C38/10

    Abstract: An R-T-B permanent magnet comprises rare-earth elements R, transition metal elements T, and boron B; wherein at least some of the rare-earth elements R is Nd and at least one of Tb and Dy; at least some of the transition metal elements T are Fe; the R-T-B permanent magnet comprises a plurality of main phase grains and grain boundary triple points each surrounded by the main phase grains; the grain boundary triple points comprise at least one of Nd and Pr, at least one of Tb and Dy, at least one of Fe and Co, and copper; the average contents of Nd, Pr, Tb, Dy, Fe, Co and Cu each (unit: atom %) are represented by [Nd], [Pr], [Tb], [Dy], [Fe], [Co] and [Cu]; ([Fe]+[Co])/([Nd]+[Pr]) is 2 or more and 5 or less; and [Cu]/([Tb]+[Dy]) is 1 or more and 4 or less.

    MAGNET STRUCTURE
    3.
    发明申请
    MAGNET STRUCTURE 审中-公开

    公开(公告)号：US20190115125A1

    公开(公告)日：2019-04-18

    申请号：US16159764

    申请日：2018-10-15

    Applicant: TDK Corporation

    Inventor： Taeko TSUBOKURA ,  Takeshi MASUDA ,  Toshihiro KUROSHIMA

    IPC: H01F1/057 ,  C22C28/00

    Abstract: The present invention provides a magnet structure comprising a first magnet, a second magnet, and an intermediate layer joining the first magnet and the second magnet. In the magnet structure, each of the first magnet and the second magnet is a permanent magnet comprising a rare earth element R, a transition metal element T, and boron B. In addition, the rare earth element R comprises: a light rare earth element RL comprising at least Nd; and a heavy rare earth element RH, and the transition metal element T comprises Fe, Co, and Cu. Further, the intermediate layer comprises: an RL oxide phase comprising an oxide of the light rare earth element RL; and an RL—Co—Cu phase comprising the light rare element RL, Co, and Cu.

    METHOD OF PROCESSING RARE EARTH MAGNET
    4.
    发明申请
    METHOD OF PROCESSING RARE EARTH MAGNET 审中-公开

    公开(公告)号：US20190255618A1

    公开(公告)日：2019-08-22

    申请号：US16278876

    申请日：2019-02-19

    Applicant: TDK Corporation

    Inventor： Takeshi MASUDA ,  Taeko TSUBOKURA ,  Hiroshi MIYASAKA ,  Yutaka HATAKEYAMA ,  Toshihiro KUROSHIMA

    IPC: B22F3/24 ,  H01F41/02 ,  H01F1/08 ,  C22C30/02 ,  B22F3/16

    Abstract: A method of processing a rare earth magnet comprises: a step of irradiating an R-T-B-based rare earth magnet with laser light to process; and a step of performing heat treatment on the magnet after the irradiating. The heat treatment includes: a step A of bringing the temperature of the magnet to 400° C. or less, a step B of holding the magnet at a temperature T1 in a range of 400 to 700° C. after the step A, and a step C of bringing the temperature of the magnet to less than 400° C. after the step B. The temperature of the magnet is made not to exceed 700° C. between the step A and the step B. The temperature of the magnet is made not to exceed 700° C. between the step B and the step C. A step of setting the magnet at a temperature higher than 700° C. after the step C is not included.

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