公开(公告)号：US11189408B2

公开(公告)日：2021-11-30

申请号：US15904986

申请日：2018-02-26

Applicant: TDK CORPORATION

Inventor： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Kenji Horino ,  Akito Hasegawa ,  Yu Yonezawa ,  Syota Goto ,  Seigo Tokoro

IPC: H01F1/153 ,  C22C45/02 ,  C22C38/20 ,  C22C33/00 ,  C22C38/04 ,  C22C38/02 ,  H01F41/02 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

Abstract: Provided is a soft magnetic alloy including Fe as a main component, in which a slope of an approximate straight line, plotted between cumulative frequencies of 20 to 80% on Fe content in each grid of 80000 grids or more, each of which has 1 nm×1 nm×1 nm, is −0.1 to −0.4, provided that Fe content (atom %) of each grid is Y axis, and the cumulative frequencies (%) obtained in descending order of Fe content in each grid is X axis, and an amorphization ratio X is 85% or more.

公开(公告)号：US10943718B2

公开(公告)日：2021-03-09

申请号：US15905027

申请日：2018-02-26

Applicant: TDK CORPORATION

Inventor： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Kenji Horino ,  Akito Hasegawa ,  Yu Yonezawa ,  Syota Goto ,  Hajime Amano

IPC: H01F1/153 ,  C22C45/02 ,  C22C38/16 ,  C22C33/00 ,  C22C38/18 ,  C22C38/02 ,  C22C38/00 ,  C22C38/12 ,  C22C33/04 ,  H01F41/02

Abstract: Provided is a soft magnetic alloy including Fe, as a main component, and including C. the soft magnetic alloy includes an Fe composite network phase having Fe-rich grids connected in a continuous measurement range including 80000 grids, each of which size is 1 nm×1 nm×1 nm. An average of C content ratio of the Fe-poor grids having cumulative frequency of 90% or more from lower C content is 5.0 times or more to an average of C content ratio of the whole soft magnetic alloy.

公开(公告)号：US10923258B2

公开(公告)日：2021-02-16

申请号：US16197996

申请日：2018-11-21

Applicant: TDK CORPORATION

Inventor： Hideharu Moro ,  Akihiro Harada ,  Yu Yonezawa

IPC: H01F1/24 ,  B22F1/00 ,  H01F27/255 ,  H01F3/08 ,  C22C33/02

Abstract: A dust core excellent in DC superimposition characteristics and low in eddy current loss at a high frequency band of several MHz, and an inductor element using the dust core. A dust core contains large and small particles of insulated soft magnetic material powder, wherein the large and small particles have a saturation magnetic flux density of 1.4 T or more, and wherein in the soft magnetic material powder observed in a cross section of the dust core, a ratio of an area occupied by large particles to an area occupied by small particles in the cross section is 9:1 to 5:5, when a group of particles having particle size of 3 μm or more and 15 μm or less is defined as the large particles, and group of particles having a particle size of 300 nm or more and 900 nm or less is defined as the small particles.

公开(公告)号：US10854365B2

公开(公告)日：2020-12-01

申请号：US15904844

申请日：2018-02-26

Applicant: TDK CORPORATION

Inventor： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Kenji Horino ,  Akito Hasegawa ,  Yu Yonezawa ,  Syota Goto ,  Seigo Tokoro

IPC: C22C45/02 ,  H01F1/153

Abstract: Provided is a soft magnetic alloy including Fe, as a main component, and including B. Among 80000 pieces of a grid having 1 nm×1 nm×1 nm in a continuous measurement range of the soft magnetic alloy, 4000 pieces of the grid from lower Fe content shows B content variation (σB) of 2.8 or more, and an amorphization ratio X of the soft magnetic alloy of 85% or more.

公开(公告)号：US10541072B2

公开(公告)日：2020-01-21

申请号：US15718757

申请日：2017-09-28

Applicant: TDK CORPORATION

Inventor： Kazuhiro Yoshidome ,  Hiroyuki Matsumoto ,  Yu Yonezawa ,  Syota Goto ,  Hideaki Yokota ,  Akito Hasegawa ,  Masahito Koeda ,  Seigo Tokoro

IPC: H01F1/147 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16

Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings. A virtual-line total distance per 1 μm3 of the soft magnetic alloy is 10 mm to 25 mm provided that the virtual-line total distance is a sum of virtual lines linking the maximum points adjacent each other. A virtual-line average distance that is an average distance of the virtual lines is 6 nm or more and 12 nm or less.

公开(公告)号：US11682510B2

公开(公告)日：2023-06-20

申请号：US16792956

申请日：2020-02-18

Applicant: TDK Corporation

Inventor： Isao Kanada ,  Yu Yonezawa

IPC: H01F1/24 ,  H01F1/33 ,  H01F3/08 ,  H01F1/20 ,  H01F1/12 ,  H01F1/44 ,  H01F1/26 ,  H01F17/00 ,  H01F17/04 ,  H01F1/22

CPC classification number: H01F1/24 ,  H01F1/12 ,  H01F1/20 ,  H01F1/33 ,  H01F3/08 ,  H01F1/22 ,  H01F1/26 ,  H01F1/442 ,  H01F17/0013 ,  H01F2017/048

Abstract: A composite magnetic material includes a powder and a resin. The powder has a main component containing Fe or Fe and Co. An average minor axis length in primary particles of the powder is 100 nm or less. A point satisfying (X, Y)=(σ/Av (%), (Av-σ)) on an XY coordinate plane is present within a region (including a boundary) surrounded by three points α(24.5, 6.7), β(72.0, 1.2), and γ(24.5, 1.2), in which an average of aspect ratios in the primary particles of the powder is set to Av, and a standard deviation of the aspect ratios in the primary particles of the powder is set to σ.