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    Magnet structure
    1.
    发明授权
    Magnet structure 有权

    公开(公告)号：US11817241B2

    公开(公告)日：2023-11-14

    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

    CPC classification number: H01F1/0577 ,  H01F41/0293

    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 based permanent magnet
    2.
    发明授权
    R-T-B based permanent magnet 有权

    公开(公告)号：US11742119B2

    公开(公告)日：2023-08-29

    申请号：US17202424

    申请日：2021-03-16

    Applicant: TDK Corporation

    Inventor： Masashi Miwa ,  Yoshitomo Tanaka ,  Koji Miura ,  Taeko Tsubokura

    IPC: H01F41/02 ,  H01F1/057 ,  C22C38/00 ,  C22C38/16 ,  C22C38/06 ,  C22C38/14 ,  C22C38/10

    CPC classification number: H01F1/057 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C2202/02

    Abstract: Provided is a permanent magnet including a rare-earth element R (such as Nd), a transition metal element T (such as Fe), B, Zr, and Cu. The permanent magnet contains a plurality of main phase grains including Nd, T, and B, and grain boundary multiple junctions, the one grain boundary multiple junction is a grain boundary surrounded by three or more of the main phase grains, one of the grain boundary multiple junctions contains a ZrB2 crystal and an R—Cu-rich phase including R and Cu, Fe is contained in the ZrB2 crystal, a total concentration of Nd and Pr in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a total concentration of Nd and Pr in the main phase grain, a concentration of Cu in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a concentration of Cu in the main phase grain, and a unit of the concentration of each of Nd, Pr, and Cu is atomic %.

    Rare earth based magnet
    3.
    发明授权
    Rare earth based magnet 有权

    公开(公告)号：US10109402B2

    公开(公告)日：2018-10-23

    申请号：US14332808

    申请日：2014-07-16

    Applicant: TDK CORPORATION

    Inventor： Eiji Kato ,  Yoshinori Fujikawa ,  Taeko Tsubokura ,  Chikara Ishizaka ,  Katsuo Sato

    IPC: H01F1/057 ,  H01F1/055 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/16

    Abstract: The present invention provides a rare earth based magnet that inhibits the high temperature demagnetization rate even when less or no heavy rare earth elements such as Dy, Tb and the like than before are used. The rare earth based magnet according to the present invention is a sintered magnet which includes R2T14B crystal grains as main phase and grain boundary phases between the R2T14B crystal grains. When the grain boundary phase surrounded by three or more main phase crystal grains is regarded as the grain boundary multi-point, the microstructure of the sintered body is controlled so that the ratio of the grain boundary triple-point surrounded by three main phase crystal grains in all grain boundary multi-points to be specified value or less.

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

    公开(公告)号：US20200303100A1

    公开(公告)日：2020-09-24

    申请号：US16823456

    申请日：2020-03-19

    Applicant: TDK CORPORATION

    Inventor： Taeko Tsubokura ,  Takeshi Masuda

    IPC: H01F1/055 ,  C22C38/06 ,  C22C38/00 ,  C22C38/10

    Abstract: To provide an R-T-B based permanent magnet having excellent magnet properties and corrosion resistance even in case Co content is too small, and also to provide R-T-B based permanent magnet suitable for a grain boundary diffusion.The R-T-B based permanent magnet in which R represents a rare earth element including at least one selected from Nd, Pr, Dy, and Tb, T represents a combination of Fe and Co, and B represents boron. The R-T-B based permanent magnet further includes Zr. A total content of Nd, Pr, Dy, and Tb is 29.5 mass % to 31.5 mass %, Co content is 0.35 mass % to 1.50 mass %, Zr content is 0.21 mass % to 0.85 mass %, B content is 0.90 mass % to 1.02 mass % with respect to 100 mass % of the R-T-B based permanent magnet.

    Rare earth based magnet
    7.
    发明授权
    Rare earth based magnet 有权

    公开(公告)号：US10546672B2

    公开(公告)日：2020-01-28

    申请号：US14229253

    申请日：2014-03-28

    Applicant: TDK CORPORATION

    Inventor： Eiji Kato ,  Yoshinori Fujikawa ,  Taeko Tsubokura ,  Chikara Ishizaka ,  Katsuo Sato

    IPC: H01F1/057

    Abstract: The present invention provides a rare earth based magnet that inhibits the high temperature demagnetization rate even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The rare earth based magnet according to the present invention includes R2T14B main phase crystal grains and grain boundary phases between adjacent main phase crystal grains. In any cross-section of the rare earth based magnet, when evaluating the circular degree of the main phase crystal grains with Wadell's Roundness A, the shape of the main phase crystal grains is controlled such that the Roundness A becomes 0.24 or more.

    Rare earth based magnet
    9.
    发明授权
    Rare earth based magnet 有权
    稀土类磁铁

    公开(公告)号：US09548149B2

    公开(公告)日：2017-01-17

    申请号：US14229296

    申请日：2014-03-28

    Applicant: TDK CORPORATION

    Inventor： Eiji Kato ,  Yoshinori Fujikawa ,  Taeko Tsubokura ,  Chikara Ishizaka ,  Katsuo Sato

    IPC: H01F1/057

    CPC classification number: H01F1/0571 ,  H01F1/0577

    Abstract: The present invention provides a rare earth based magnet having a microstructure in which in a section of the R2T14B main-phase crystal grains, the number density of the fine products in the interior of (inside) the crystal grains is larger than that in the periphery of (outside) the crystal grains. That is, the rare earth based magnet includes R2T14B main-phase crystal grains and grain boundary phases formed between the R2T14B main-phase crystal grains. The R2T14B main-phase crystal grains include a substance where fine products are formed in the crystal grains. In the section of the main-phase crystal grains, when the crystal grains are divided into the interior of the crystal grains and the periphery of the crystal grains with a specific ellipse, the fine products are formed such that the number density in the interior is larger than that in the periphery.

    Abstract translation: 本发明提供一种稀土类磁体，其具有微结构，其中在R2T14B主相晶粒的截面中，晶粒内部（内部）的细微产物的数量密度大于周边 （外）晶粒。 也就是说，稀土类磁体包括在R2T14B主相晶粒之间形成的R2T14B主相晶粒和晶界相。 R2T14B主相晶粒包括在晶粒中形成细小产物的物质。 在主相晶粒的截面中，当晶粒分为晶粒内部和具有特定椭圆的晶粒周边时，形成精细产物，使得内部的数量密度为 大于周边的。

    SINTERED MAGNET
    10.
    发明申请
    SINTERED MAGNET 有权
    烧结磁铁

    公开(公告)号：US20150170810A1

    公开(公告)日：2015-06-18

    申请号：US14409186

    申请日：2013-06-21

    Applicant: TDK Corporation

    Inventor： Masashi Miwa ,  Atsushi Fujiwara ,  Eiji Kato ,  Taeko Tsubokura ,  Koji Mitake ,  Chikara Ishizaka

    IPC: H01F1/057 ,  C22C38/16 ,  B22F3/10 ,  C22C38/10 ,  C22C38/06 ,  C22C38/00 ,  H01F7/02 ,  C22C38/14

    CPC classification number: H01F1/0577 ,  B22F3/10 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  H01F7/02

    Abstract: A sintered magnet of a preferred embodiment has a composition comprising: R (R is a rare earth element that must contain any one of Nd and Pr.): 29.5 to 33.0 mass %; B: 0.7 to 0.95 mass %; Al: 0.03 to 0.6 mass %; Cu: 0.01 to 1.5 mass %; Co: 3.0 mass % or less (provided that 0 mass % is not included.); Ga: 0.1 to 1.0 mass %; C: 0.05 to 0.3 mass %; O: 0.03 to 0.4 mass %; and Fe and other elements: a balance, and wherein a content of heavy rare earth elements in total is 1.0 mass % or less, and wherein the following relations are satisfied: 0.29

    Abstract translation: 优选实施方案的烧结磁体具有如下组成：R（R是必须含有Nd和Pr中的任一种的稀土元素）：29.5〜33.0质量％ B：0.7〜0.95质量％ Al：0.03〜0.6质量％ Cu：0.01〜1.5质量％ Co：3.0质量％以下（不含0质量％）。 Ga：0.1〜1.0质量％ C：0.05〜0.3质量％ O：0.03〜0.4质量％ Fe等元素：余量，其中重稀土元素的含量总计为1.0质量％以下，其中满足以下关系：0.29 <[B] /（[Nd] + [Pr]） <0.40和0.07 <（[Ga] + [C]）/ [B] <0.60，其中[Nd]，[Pr]，[B]，[C]和[Ga]表示Nd，Pr ，B，C和Ga。

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