公开(公告)号：US20230178275A1

公开(公告)日：2023-06-08

申请号：US17992378

申请日：2022-11-22

Applicant: TDK CORPORATION

Inventor： Masahito KOEDA ,  Satoko MORI ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: H01F1/147 ,  H01F3/08 ,  H01F1/153

CPC classification number: H01F1/1475 ,  H01F3/08 ,  H01F1/15383 ,  H01F1/15308

Abstract: A soft magnetic metal powder including a soft magnetic metal particle. The soft magnetic metal particle includes a metal particle and an oxide part covering the metal particle. An interface between the metal particle and the oxide part has roughness. A maximum height Rz of roughness at the interface between the metal particle and the oxide part is within a range of 1.0 nm or more and 50.0 nm or less.

公开(公告)号：US20210098164A1

公开(公告)日：2021-04-01

申请号：US17036447

申请日：2020-09-29

Applicant: TDK CORPORATION

Inventor： Masahito KOEDA ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

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

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：US20180122540A1

公开(公告)日：2018-05-03

申请号：US15794836

申请日：2017-10-26

Applicant: TDK CORPORATION

Inventor： Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Kazuhiro YOSHIDOME ,  Akihiro HARADA ,  Akito HASEGAWA ,  Hajime AMANO ,  Kensuke ARA ,  Masahito KOEDA ,  Seigo TOKORO

IPC: H01F1/055 ,  C22C38/26 ,  C22C38/16 ,  C22C38/14 ,  C22C38/32 ,  C22C38/00 ,  B22D23/00

CPC classification number: H01F1/0551 ,  B22D23/003 ,  B22F2998/10 ,  B22F2999/00 ,  B82Y30/00 ,  C22C33/02 ,  C22C38/00 ,  C22C38/002 ,  C22C38/005 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/26 ,  C22C38/32 ,  C22C45/02 ,  C22C2200/02 ,  C22C2202/02 ,  H01F1/0556 ,  H01F1/15308 ,  H01F1/15333 ,  B22F9/082 ,  B22F3/02 ,  B22F3/10 ,  B22F2202/05

Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1-(α+β))X1αX2β)(1-(a+b+c+d+e))MaBbPcCrdCue)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. 0.020≤a≤0.060, 0.020≤b≤0.060, 0≤c≤0.030, 0≤d≤0.050, 0≤e≤0.030, 0

公开(公告)号：US20240404743A1

公开(公告)日：2024-12-05

申请号：US18677053

申请日：2024-05-29

Applicant: TDK CORPORATION

Inventor： Masahito KOEDA ,  Kensuke ARA ,  Satoko MORI

IPC: H01F27/255 ,  H01F27/28

Abstract: A magnetic core includes a soft magnetic powder. The soft magnetic powder accounts for an area ratio of 75% or more and 90% or less of a section of the magnetic core on average. The area ratio of the soft magnetic powder has a distribution with a skewness of 0.01 or more in absolute value. The distribution of the area ratio of the soft magnetic powder is identified by calculating area ratios of the soft magnetic powder in respective square regions defined by dividing the section of the magnetic core using a regular-interval grid.

公开(公告)号：US20180204657A1

公开(公告)日：2018-07-19

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

CPC classification number: H01F1/15383 ,  B22F1/007 ,  B22F1/0074 ,  B22F1/02 ,  B22F3/02 ,  B22F3/24 ,  B22F2003/248 ,  B22F2301/35 ,  B22F2998/10 ,  C22C45/02 ,  C22C2202/02 ,  H01F1/15366 ,  H01F1/26 ,  H01F3/08 ,  H01F17/0013 ,  H01F17/04 ,  H01F27/255 ,  H01F27/292

Abstract: The soft magnetic material, the core, and the inductor have high permittivity 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：US20180122543A1

公开(公告)日：2018-05-03

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: H01F1/153 ,  C22C45/02

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：US20190355499A1

公开(公告)日：2019-11-21

申请号：US16415722

申请日：2019-05-17

Applicant: TDK CORPORATION

Inventor： Hideharu MORO ,  Akihiro HARADA ,  Masahito KOEDA

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

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：US20180122542A1

公开(公告)日：2018-05-03

申请号：US15794566

申请日：2017-10-26

Applicant: TDK CORPORATION

Inventor： Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Kazuhiro YOSHIDOME ,  Akihiro HARADA ,  Akito HASEGAWA ,  Hajime AMANO ,  Kensuke ARA ,  Masahito KOEDA ,  Seigo TOKORO

IPC: H01F1/153 ,  C22C38/00 ,  C22C38/32 ,  C22C38/28 ,  C22C45/00

CPC classification number: H01F1/15333 ,  B22D11/0611 ,  B82Y30/00 ,  C21D2201/03 ,  C22C33/003 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/48 ,  C22C38/54 ,  C22C45/008 ,  C22C45/02 ,  H01F1/15308 ,  H01F1/15341

Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1-(α+β))X1αX2β)(1-(a+b+c+d+e))MaBbPcCrdCue)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≤0.20, 0

公开(公告)号：US20180096765A1

公开(公告)日：2018-04-05

申请号：US15718617

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 ,  H01F27/255 ,  C22C38/16 ,  C22C38/12 ,  C22C38/02

CPC classification number: H01F1/14766 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16 ,  H01F1/15308 ,  H01F27/255

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 in 400,000/μm3 or more. A ratio of Fe content maximum points whose coordination number is 1 or more and 5 or less is 80% or more and 100% or less with respect to all of the Fe content maximum points.

公开(公告)号：US20180197666A1

公开(公告)日：2018-07-12

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 ,  H01F27/255 ,  H01F1/153 ,  H01F3/08

CPC classification number: H01F1/24 ,  H01F1/15308 ,  H01F1/26 ,  H01F3/08 ,  H01F17/04 ,  H01F27/255

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.