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：US10748688B2

公开(公告)日：2020-08-18

申请号：US15794578

申请日：2017-10-26

Applicant: TDK CORPORATION

Inventor： Akihiro Harada ,  Hiroyuki Matsumoto ,  Kenji Horino ,  Kazuhiro Yoshidome ,  Akito Hasegawa ,  Hajime Amano ,  Kensuke Ara ,  Masahito Koeda ,  Seigo Tokoro

IPC: C22C38/28 ,  H01F1/153 ,  C22C38/00 ,  C22C38/26 ,  C22C38/42 ,  B82Y25/00 ,  C22C38/48 ,  C22C38/20 ,  C22C38/32 ,  C22C33/02 ,  C22C45/02 ,  H01F41/02

Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1−(α+β))X1αX2β)(1−(a+b+d+e))MaBbCrdCue)1−fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030≤a≤0.14, 0.028≤b≤0.15, 0.005≤d≤0.020, 0

公开(公告)号：US11569014B2

公开(公告)日：2023-01-31

申请号：US16415722

申请日：2019-05-17

Applicant: TDK CORPORATION

Inventor： Hideharu Moro ,  Akihiro Harada ,  Masahito Koeda

IPC: H01F1/24 ,  H01F27/255 ,  H01F3/08 ,  B22F1/052

Abstract: A dust core includes large particles having an average particle size of 8-15 μm, medium particles having an average particle size of 1-5 μm, and small particles having an average particle size of 300-900 nm when a cross section thereof is observed. An area ratio occupied by the large particles is 50% to 90%, an area ratio occupied by the medium particles is 0% to 30%, and an area ratio occupied by the small particles is 5% to 30%, when a total area ratio occupied by the large particles, the medium particles and the small particles is 100% in the cross section. Vickers hardness (Hv) of the large particles, the medium particles and the small particles is 150-600 respectively. The small particles are alloy powder containing Fe and at least Si or N. The dust core may be included in an inductor element.

公开(公告)号：US11705259B2

公开(公告)日：2023-07-18

申请号：US17036447

申请日：2020-09-29

Applicant: TDK CORPORATION

Inventor： Masahito Koeda ,  Kazuhiro Yoshidome ,  Hiroyuki Matsumoto

IPC: H01F3/08 ,  H01F1/153 ,  H01F1/24

CPC classification number: H01F3/08 ,  H01F1/15333 ,  H01F1/24

Abstract: According to an aspect, a soft magnetic metal powder includes a plurality of soft magnetic metal particles containing iron, a surface of each of the soft magnetic metal particles is covered with a coating part, and a maximum height Sz of a surface of the coating part is 10 to 700 nm. According to another aspect, a soft magnetic metal powder includes a plurality of soft magnetic metal particles containing iron, a surface of each of the soft magnetic metal particles is covered with a coating part, and a maximum height Rz of a surface of the coating part is 10 to 700 nm.

公开(公告)号：US10763019B2

公开(公告)日：2020-09-01

申请号：US15868439

申请日：2018-01-11

Applicant: TDK CORPORATION

Inventor： Yoshihiro Shinkai ,  Takashi Kamiya ,  Masahito Koeda ,  Kyotaro Abe

IPC: H01F1/24 ,  H01F1/153 ,  H01F3/08 ,  H01F27/255 ,  H01F17/04 ,  H01F1/26

Abstract: A soft magnetic material comprising a soft magnetic metal powder and a resin, wherein the soft magnetic metal powder is constituted from a particle group α and group β, when IA is a peak intensity of the particle group α, IB is a peak intensity of the particle group β, and IC is a minimum intensity present between the particle group α and group β, then an intensity ratio IC/IA satisfies 0.10 or less and an intensity ratio IA/IB satisfies 1.2 or more and 3.0 or less, the particle group α having a maximum peak intensity in a size distribution of the soft magnetic metal powder, the particle group β having an peak intensity which is the second largest to the particle group α, and a peak particle size PA of the particle group α is larger than a peak particle size PB of the particle group β.

公开(公告)号：US10573442B2

公开(公告)日：2020-02-25

申请号：US15868363

申请日：2018-01-11

Applicant: TDK CORPORATION

Inventor： Yoshihiro Shinkai ,  Masahito Koeda ,  Kyotaro Abe

IPC: H01F1/153 ,  H01F27/255 ,  B22F1/00 ,  B22F1/02 ,  B22F3/02 ,  B22F3/24 ,  C22C45/02 ,  H01F17/04 ,  H01F1/26 ,  H01F17/00 ,  H01F3/08 ,  H01F27/29

Abstract: The object of the present invention is to provide the soft magnetic material, the core, and the inductor having high permeability and excellent DC superimposition characteristic.A soft magnetic material comprising a soft magnetic metal powder and a resin, wherein said soft magnetic metal powder is constituted from a particle group α and a particle group β, when IA is a peak intensity of the particle group α, Vα is the volume of the particle group α, IB is a peak intensity of the particle group β, Vβ is the volume of the particle group β, and IC is a minimum intensity present between the particle group α and the particle group β, then an intensity ratio IC/IA satisfies 0.12 or less, and a volume ratio Vα/Vβ is 2.0 or more and 5.1 or less.

公开(公告)号：US09245676B2

公开(公告)日：2016-01-26

申请号：US13687072

申请日：2012-11-28

Applicant: TDK CORPORATION

Inventor： Masahito Koeda ,  Yoshihiro Shinkai ,  Tomofumi Kuroda

IPC: H01F27/02 ,  H01F5/00 ,  H01F27/28 ,  H01F7/02 ,  H01F1/20 ,  H01F1/24 ,  H01F1/147 ,  H01F1/26 ,  H01F3/08

CPC classification number: H01F7/02 ,  H01F1/14733 ,  H01F1/20 ,  H01F1/24 ,  H01F1/26 ,  H01F3/08

Abstract: Provided are a soft magnetic alloy powder, a compact made from the soft magnetic alloy powder, a powder magnetic core including the compact, and a magnetic element including the powder magnetic core. The soft magnetic alloy powder contains Fe—Ni-based particles containing 38% to 48% by mass Ni, 1.0% to 15% by mass Co, and 1.2% to 10% by mass Si relative to the total mass of Fe, Ni, Co, and Si, the remainder being Fe. The Fe—Ni-based particles have an average size of more than 1 μm to less than 10 μm.

Abstract translation: 提供一种软磁性合金粉末，由软磁性合金粉末制成的压块，包括该压块的粉末磁芯，以及包括该粉末磁芯的磁性元件。 软磁性合金粉末含有相对于Fe，Ni的总质量，含有38质量％至48质量％的Ni，1.0质量％至15质量％的Co和1.2质量％至10质量％的Si的Fe-Ni基颗粒， Co和Si，其余为Fe。 Fe-Ni系颗粒的平均粒径大于1μm至小于10μm。