公开(公告)号：US20180082772A1

公开(公告)日：2018-03-22

申请号：US15560907

申请日：2016-03-25

Applicant: TDK CORPORATION

Inventor： Wakako OKAWA ,  Syota GOTO ,  Yoshinori FUJIKAWA

IPC: H01F1/057 ,  C22C30/00 ,  C22C28/00 ,  B22F9/04 ,  B22F3/16 ,  B22F3/24

CPC classification number: H01F1/0577 ,  B22F3/00 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2201/20 ,  B22F2301/45 ,  C22C28/00 ,  C22C30/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C2200/00 ,  C22C2202/02 ,  H01F1/057 ,  H01F1/0576 ,  H01F1/08

Abstract: A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include Ga. A concentration ratio A (A=αGa/βGa) of the main phase grains is 1.20 or more, where αGa and βGa are respectively a highest concentration of Ga and a lowest concentration of Ga in one main phase grain.

公开(公告)号：US20150179319A1

公开(公告)日：2015-06-25

申请号：US14579315

申请日：2014-12-22

Applicant: TDK CORPORATION

Inventor： Yoshinori FUJIKAWA ,  Yuki NAGAMINE ,  Wakako OKAWA ,  Chikara ISHIZAKA ,  Eiji KATO ,  Katsuo SATO

IPC: H01F1/057

CPC classification number: H01F1/057 ,  H01F1/0577

Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the main phases and the crystal boundary phases among R2T14B crystal grains. The microstructure of the sintered body is controlled by at least containing the first crystal boundary phases and the second crystal boundary phases, wherein the first crystal boundary phases contain at least R-T-M in the ranges of 20 to 40 atomic % for R, 60 to 75 atomic % for T and 1 to 10 atomic % for M, and the second crystal boundary phases contains at least R-T-M in the ranges of 50 to 70 atomic % for R, 10 to 30 atomic % for T and 1 to 20 atomic % for M.

Abstract translation: 本发明提供了一种稀土类磁体，其中即使Dy和Tb等重稀土元素的量与过去相比明显减少，也可以抑制高温下的退磁率，或者不存在这种重稀土 使用地球元素。 本发明的稀土类磁体是以R2T14B晶粒为主相和R2T14B晶粒之间的晶界相的烧结磁体。 烧结体的显微结构至少含有第一晶界相和第二晶界边界相，其中第一晶界相至少含有R为20〜40原子％的RTM，60〜75原子 对于T为1％，对于M为1至10原子％，并且第二晶界相至少包含在R为50至70原子％，T为10至30原子％和对于M为1至20原子％的范围内的RTM。

公开(公告)号：US20150179318A1

公开(公告)日：2015-06-25

申请号：US14578713

申请日：2014-12-22

Applicant: TDK CORPORATION

Inventor： Yoshinori FUJIKAWA ,  Yuki NAGAMINE ,  Wakako OKAWA ,  Chikara ISHIZAKA ,  Eiji KATO ,  Katsuo SATO

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

CPC classification number: H01F1/057 ,  C22C33/0278 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0577

Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the major phases and the crystal boundary phases among the R2T14B crystal grains. The microstructure of the sintered body is controlled by including crystal boundary phases containing at least R, T and M in the crystal boundary phases, wherein the relative atomic ratios of R, T and M are as follows, i.e., 60 to 80% for R, 15 to 35% for T and 1 to 20% for M.

Abstract translation: 本发明提供了一种稀土类磁体，其中即使Dy和Tb等重稀土元素的量与过去相比明显减少，也可以抑制高温下的退磁率，或者不存在这种重稀土 使用地球元素。 本发明的稀土类磁体是包含R2T14B晶粒作为主相和R 2T14B晶粒中的晶界相的烧结磁体。 通过在晶界边界相中包含至少含有R，T和M的晶界相来控制烧结体的组织，其中R，T和M的相对原子比如下，即R为60〜80％ ，T为15〜35％，M为1〜20％

公开(公告)号：US20240145146A1

公开(公告)日：2024-05-02

申请号：US18498337

申请日：2023-10-31

Applicant: TDK CORPORATION

Inventor： Mutsuko NAKANO ,  Yasuhisa OKANO ,  Takao NOGUCHI ,  Wakako OKAWA ,  Yoshitomo TANAKA

IPC: H01F10/13 ,  H10N35/80

CPC classification number: H01F10/136 ,  H10N35/80

Abstract: A magnetostrictive film includes rich regions having a mesh pattern in a cross section perpendicular to a film thickness direction of the magnetostrictive film. The rich regions are richer in a specific element contributing to ferromagnetism than surroundings of the rich regions.

公开(公告)号：US20180114616A1

公开(公告)日：2018-04-26

申请号：US15560795

申请日：2016-03-25

Applicant: TDK CORPORATION

Inventor： Wakako OKAWA ,  Syota GOTO ,  Yoshinori FUJIKAWA

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

CPC classification number: H01F1/0577 ,  B22F3/00 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2201/20 ,  B22F2301/45 ,  C22C28/00 ,  C22C30/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C2200/00 ,  C22C2202/02 ,  H01F1/057 ,  H01F1/0576 ,  H01F1/08

Abstract: A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include B. A concentration ratio A (A=αB/βB) of the main phase grains is 1.05 or more, where αB and βB are respectively a highest concentration of B and a lowest concentration of B in one main phase grain.

公开(公告)号：US20180108463A1

公开(公告)日：2018-04-19

申请号：US15560695

申请日：2016-03-25

Applicant: TDK CORPORATION

Inventor： Wakako OKAWA ,  Syota GOTO ,  Yoshinori FUJIKAWA

IPC: H01F1/057 ,  C22C38/00 ,  H01F1/08

CPC classification number: H01F1/0577 ,  B22F3/00 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2201/20 ,  B22F2301/45 ,  C22C28/00 ,  C22C30/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C2200/00 ,  C22C2202/02 ,  H01F1/057 ,  H01F1/0576 ,  H01F1/08

Abstract: A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include C. A concentration ratio A1 (A1=αC/βC) of the main phase grains is 1.50 or more, where αC and βC are respectively a highest concentration of C and a lowest concentration of C in one main phase grain.

公开(公告)号：US20150179317A1

公开(公告)日：2015-06-25

申请号：US14578621

申请日：2014-12-22

Applicant: TDK CORPORATION

Inventor： Yoshinori FUJIKAWA ,  Yuki NAGAMINE ,  Wakako OKAWA ,  Chikara ISHIZAKA ,  Eiji KATO ,  Katsuo SATO

IPC: H01F1/057

CPC classification number: H01F1/057 ,  H01F1/0577

Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the main phases and the crystal boundary phases among the R2T14B crystal grains. The microstructure of the sintered body is controlled by including crystal boundary phases containing at least R, T and M in the crystal boundary phases, wherein the relative atomic ratios of R, T and M are as follows, i.e., 25 to 35% for R, 60 to 70% for T and 2 to 10% for M.

Abstract translation: 本发明提供了一种稀土类磁体，其中即使Dy和Tb等重稀土元素的量与过去相比明显减少，也可以抑制高温下的退磁率，或者不存在这种重稀土 使用地球元素。 本发明的稀土类磁体是包含R2T14B晶粒作为主相和R2T14B晶粒中的晶界相的烧结磁体。 烧结体的微结构通过在晶界边界相中包含至少含有R，T和M的晶界相来控制，其中R，T和M的相对原子比如下，即R为25〜35％ ，T为60〜70％，M为2〜10％