公开(公告)号：US20220254553A1

公开(公告)日：2022-08-11

申请号：US17628815

申请日：2020-07-21

Applicant: TDK CORPORATION

Inventor： Ryoma NAKAZAWA ,  Hiroyuki ONO

IPC: H01F1/24 ,  H01F27/255 ,  B22F1/16

Abstract: A soft magnetic powder capable of maintaining high insulation resistance even after exposure to a high-temperature environment, a dust core, and an electronic component is provided with the dust core. A soft magnetic powder including soft magnetic metal particles, the surfaces of which are covered by an inorganic insulating coating, the inorganic insulating coating having a first coating part in contact with the surfaces of the soft magnetic metal particles, and a second coating part formed on the outside of the first coating part, the first coating part including phosphorus and oxygen, and the second coating part including silicon and oxygen.

公开(公告)号：US20180068771A1

公开(公告)日：2018-03-08

申请号：US15694509

申请日：2017-09-01

Applicant: TDK CORPORATION

Inventor： Ryoma NAKAZAWA ,  Yousuke FUTAMATA ,  Takeshi TAKAHASHI

IPC: H01F1/24 ,  H01F41/02 ,  B29B7/90 ,  B29C43/00

CPC classification number: H01F1/24 ,  B22F1/02 ,  B22F9/026 ,  B22F2998/10 ,  B22F2999/00 ,  B29B7/90 ,  B29C43/003 ,  B29K2105/16 ,  B29K2505/00 ,  B29K2995/0008 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C45/02 ,  C22C2202/02 ,  H01F3/08 ,  H01F41/0246 ,  C22C33/02 ,  B22F9/082 ,  B22F3/1039 ,  B22F1/0011

Abstract: A dust core including a metal magnetic powder and a resin, in which the metal magnetic powder shows a particle diameter of more than 0 μm and 200 μm or less, a number percentage of 5.0% or more of metal magnetic particles among the metal magnetic particles composing the metal magnetic powder are at least partially surface-coated with an inorganic compound including an alkaline earth metal, in a coating part coating the metal magnetic particles, an amount of the alkaline earth metal is 10.0 mass % or more, when a total amount of a metal element included in the coating part is 100 mass %, is provide. The dust core is superior in a corrosion-resistance.

公开(公告)号：US20250111982A1

公开(公告)日：2025-04-03

申请号：US18899985

申请日：2024-09-27

Applicant: TDK CORPORATION

Inventor： Katsushi YASUHARA ,  Ryoma NAKAZAWA ,  Yuji SEZAI ,  Sena YOSHINO

IPC: H01F27/255 ,  H01F27/28

Abstract: A coil component may include a core portion including a soft magnetic metal material and a winding portion including a conductor wound. The winding portion may be inside the core portion. The core portion may include a central portion and an outer portion. The central portion may be disposed in an inside diameter portion of the winding portion. The outer portion may be disposed in a portion other than the central portion. The central portion may include a first central portion and a second central portion including different materials. The second central portion may be disposed around the first central portion. H, S, and S1 may be within specific ranges, where H denotes a height of the winding portion, S denotes a sectional area of the central portion, and S1 denotes a sectional area of the first central portion.

公开(公告)号：US20180294084A1

公开(公告)日：2018-10-11

申请号：US15915901

申请日：2018-03-08

Applicant: TDK CORPORATION

Inventor： Masahiro KAMIYA ,  Yasuhide YAMASHITA ,  Chiomi SATO ,  Yousuke FUTAMATA ,  Ryoma NAKAZAWA ,  Takeshi TAKAHASHI ,  Hiroyuki ONO

IPC: H01F1/24 ,  H01F1/33 ,  H01F3/08 ,  B22F1/02 ,  H01F41/02 ,  C22C38/02

Abstract: A dust core includes a metal magnetic material, a resin, and an insulation film. The insulation film contacts with a surface of the metal magnetic material and covers the metal magnetic material. The insulation film includes a first film and a second film. The first film contacts with the surface of the metal magnetic material. The second film contacts with a surface of the first film. A density of the first film is higher than a density of the second film.

公开(公告)号：US20180019043A1

公开(公告)日：2018-01-18

申请号：US15643956

申请日：2017-07-07

Applicant: TDK CORPORATION

Inventor： Koji MIURA ,  Ryoma NAKAZAWA ,  Katsushi YASUHARA ,  Tomohisa MITOSE

IPC: H01F1/147 ,  C22C38/10 ,  B22F9/08 ,  H01F3/08 ,  C22C38/02

CPC classification number: H01F1/14766 ,  B22F9/082 ,  B22F2001/0066 ,  B22F2301/35 ,  B22F2304/10 ,  B22F2998/10 ,  C22C1/05 ,  C22C33/0264 ,  C22C33/0285 ,  C22C38/02 ,  C22C38/10 ,  C22C2202/02 ,  H01F3/08 ,  B22F2003/023

Abstract: A soft magnetic metal powder includes a plurality of soft magnetic metal particles composed of an Fe—Co based alloy. The Fe—Co based alloy includes 0.50 mass % or more and 8.00 mass % or less of Co and a remaining part composed of Fe and an inevitable impurity. A soft magnetic metal powder includes a plurality of soft magnetic metal particles composed of an Fe—Co based alloy. The Fe—Co based alloy includes 0.50 mass % or more and 8.00 mass % or less of Co, 0.01 mass % or more and 8.00 mass % or less of Si, and a remaining part composed of Fe and an inevitable impurity. The present invention can provide a soft magnetic metal powder or so having a favorable corrosion resistance.

公开(公告)号：US20240304366A1

公开(公告)日：2024-09-12

申请号：US18594115

申请日：2024-03-04

Applicant: TDK Corporation

Inventor： Ryoma NAKAZAWA ,  Ryuichi WADA ,  Yu SAKURAI

IPC: H01F1/24 ,  H01F1/147

CPC classification number: H01F1/24 ,  H01F1/14766

Abstract: A soft magnetic metal particle may include a core particle and an insulating film over a surface of the core particle. The insulating film may include a complex oxide containing Si and B. B may constitute 1.0 mol % or more and 60.0 mol % or less of a total of Si and B in the insulating film.

公开(公告)号：US20220406502A1

公开(公告)日：2022-12-22

申请号：US17831729

申请日：2022-06-03

Applicant: TDK CORPORATION

Inventor： Ayumi TSUCHIDA ,  Ryoma NAKAZAWA ,  Junichi SHIMAMURA

IPC: H01F1/28 ,  H01F3/08

Abstract: A dust core includes magnetic particles, an epoxy resin, and an additive. The epoxy resin has at least two or more mesogenic skeletons between two epoxy bonds adjacent along a molecular chain. The additive includes one or more metallic elements selected from Li, Ba, Mg, and Ca.

公开(公告)号：US20180261385A1

公开(公告)日：2018-09-13

申请号：US15915852

申请日：2018-03-08

Applicant: TDK CORPORATION

Inventor： Ryoma NAKAZAWA ,  Takeshi TAKAHASHI

IPC: H01F41/02 ,  H01F1/24 ,  H01F27/255

CPC classification number: H01F41/0246 ,  H01F1/24 ,  H01F1/26 ,  H01F1/33 ,  H01F3/08 ,  H01F27/255

Abstract: A dust core includes a metal magnetic material and a resin. Fine particles exist on a surface of the dust core.

公开(公告)号：US20250111967A1

公开(公告)日：2025-04-03

申请号：US18898794

申请日：2024-09-27

Applicant: TDK Corporation

Inventor： Ryoma NAKAZAWA ,  Hiroyuki ONO

IPC: H01F1/24 ,  B22F1/17 ,  H01F3/08

Abstract: A soft magnetic metal particle may include a core particle and an insulation coating formed on a surface of the core particle. The insulation coating may include a first layer, a second layer, and a third layer. The first layer may contact the surface of the core particle, and the second layer may contact the first layer and the third layer. The first layer may include at least Fe, the second layer may include at least Ti, and the third layer may include at least Si.

公开(公告)号：US20230317334A1

公开(公告)日：2023-10-05

申请号：US18128273

申请日：2023-03-30

Applicant: TDK Corporation

Inventor： Ryoma NAKAZAWA

IPC: H01F1/24 ,  H01F27/255 ,  B22F9/08 ,  B22F1/145 ,  B22F1/142 ,  B22F1/16 ,  B22F3/16

CPC classification number: H01F1/24 ,  H01F27/255 ,  B22F9/082 ,  B22F1/145 ,  B22F1/142 ,  B22F1/16 ,  B22F3/16 ,  B22F2301/35 ,  B22F2304/10 ,  B22F2302/256 ,  B22F2998/10 ,  B22F2999/00

Abstract: A dust core including soft magnetic metal particles and a grain boundary phase, wherein the grain boundary phase includes Si and Ti.