公开(公告)号：US20240177898A1

公开(公告)日：2024-05-30

申请号：US18284139

申请日：2022-02-25

Applicant: TDK CORPORATION

Inventor： Nobuhiro OKUDA ,  Hiroyuki MATSUMOTO ,  Kazuhiro YOSHIDOME

IPC: H01F1/147 ,  H01F1/20 ,  H01F3/08

CPC classification number: H01F1/147 ,  H01F1/20 ,  H01F3/08

Abstract: A soft magnetic powder includes Fe and Co. The total content of Fe and Co with respect to the soft magnetic powder overall is 90 mass % or greater. The Fe content with respect to the total content of Fe and Co is 30-95 mass %. The average particle diameter of the soft magnetic powder is 0.10-5.0 μm. The amount of oxygen on the surface of the soft magnetic powder is 0.010 g/m2 or less. The true density of the soft magnetic powder with respect to the theoretical density of the soft magnetic powder is 90-99%.

公开(公告)号：US20230272512A1

公开(公告)日：2023-08-31

申请号：US18112238

申请日：2023-02-21

Applicant: TDK CORPORATION

Inventor： Satoko MORI ,  Hajime AMANO ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: C22C38/10 ,  H01F1/147

CPC classification number: C22C38/10 ,  H01F1/14733 ,  C22C2202/02

Abstract: A nanogranular magnetic film comprises a structure including first phases comprised of nano-domains dispersed in a second phase. A ratio of a volume of the first phases to a total volume of the first phases and the second phase is 65% or less. A largest one of A(Fe1)/A(Fe2), A(Co1)/A(Co2), and A(Ni1)/A(Ni2) has a value of 1.20 or more and 8.00 or less, provided that a percentage of Fe in the first phases is A(Fe1), a percentage of Fe in the second phase is A(Fe2), a percentage of Co in the first phases is A(Co1), a percentage of Co in the second phase is A(Co2), a percentage of Ni in the first phases is A(Ni1), and a percentage of Ni in the second phase is A(Ni2). The first phases comprised of the nano-domains have an average size of 2 nm or more and 30 nm or less.

公开(公告)号：US20230170115A1

公开(公告)日：2023-06-01

申请号：US17992409

申请日：2022-11-22

Applicant: TDK CORPORATION

Inventor： Yoshiki KAJIURA ,  Hiroyuki MATSUMOTO ,  Kazuhiro YOSHIDOME ,  Satoko MORI

IPC: H01F1/147 ,  B22F1/16 ,  C22C38/18 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: H01F1/14766 ,  B22F1/16 ,  C22C38/18 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C2202/02 ,  B22F2301/35 ,  B22F2302/25

Abstract: A soft magnetic powder includes soft magnetic metal particles. The soft magnetic metal particles include metal particles and oxide parts covering the metal particles. Each of the metal particles at least include Fe. Each of the oxide parts at least include Fe and Mn. Concentration distributions of Mn of the soft magnetic particles have maximum concentrations of Mn in the oxide parts.

公开(公告)号：US20210159001A1

公开(公告)日：2021-05-27

申请号：US16952770

申请日：2020-11-19

Applicant: TDK CORPORATION

Inventor： Takuya TSUKAHARA ,  Isao NAKAHATA ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: H01F1/153 ,  C22C38/02 ,  C22C38/00 ,  C22C38/12

Abstract: A soft magnetic alloy ribbon having high corrosion resistance is obtained. The soft magnetic alloy ribbon contains Fe, P, and Si. A maximum point of a concentration of P and a maximum point of a concentration of Si including in oxides is present in a region within 20 nm from the surface, when a concentration distribution of an element contained in the soft magnetic alloy ribbon is measured from a surface toward an interior of the soft magnetic alloy ribbon in a thickness direction.

公开(公告)号：US20210035720A1

公开(公告)日：2021-02-04

申请号：US16939484

申请日：2020-07-27

Applicant: TDK Corporation

Inventor： Satoko MORI ,  Kazuhiro YOSHIDOME ,  Akito HASEGAWA ,  Hiroyuki MATSUMOTO

IPC: H01F1/153 ,  B22F1/02 ,  C22C38/12 ,  C22C38/14 ,  C22C38/00

Abstract: Provided is a soft magnetic metal powder including a plurality of soft magnetic metal particles. Each of the soft magnetic metal particles includes a metal particle and an oxidized part covering the metal particle. The metal particle includes at least Fe. The oxidized part includes at least one kind of element of S and an element M. The element M is at least one kind of element selected from the group consisting of Nb, Ta, W, Zr, Hf, and Cr. A unit of a concentration of each of S and the element M in the metal particle and the oxidized part is atom %. The concentration of S or the element M in the metal particle and the oxidized part has a maximum value in the oxidized part.

公开(公告)号：US20210005364A1

公开(公告)日：2021-01-07

申请号：US16977738

申请日：2019-03-01

Applicant: TDK CORPORATION

Inventor： Isao NAKAHATA ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Akito HASEGAWA

IPC: H01F1/153 ,  H01F41/02 ,  H01F27/25

Abstract: A magnetic core and the like having a stable soft magnetic property, including a plurality of soft magnetic layers which are laminated, wherein a crack is formed in the soft magnetic layers. The soft magnetic layers include Fe as a principal component. The soft magnetic layers include a composition formula (Fe(1−(α+β))X1αX2β)(1−(a+b+c+d+e+f))MaBbPcSidCeSf, wherein: X1 is one or more selected from the group consisting of Co and Ni, X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, and O and rare-earth elements, M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Mo, V, and W; and a to f and α and β are in predetermined ranges. A structure including a nanoheterostructure or an Fe-group nanocrystal is observed in the soft magnetic layers.

公开(公告)号：US20180218811A1

公开(公告)日：2018-08-02

申请号：US15880859

申请日：2018-01-26

Applicant: TDK CORPORATION

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

IPC: H01F1/153 ,  H01F1/00 ,  H01F27/255

CPC classification number: H01F1/15325 ,  H01F1/0045 ,  H01F1/15333 ,  H01F27/255 ,  H01F41/0226

Abstract: A soft magnetic alloy comprising a main component having a compositional formula of ((Fe(1−(α+β))X1αX2β)(1−(a+b))MaBb)1−cCc, and a sub component including P, S and Ti, wherein X1 is selected from the group Co and Ni, X2 is selected from the group Al, Mn, Ag, Zn, Sn, As, Sb, Bi, and rare earth elements, “M” is one or more selected from the group Nb, Hf, Zr, Ta, Mo, W, and V, 0.030≤a≤0.14, 0.005≤b≤0.20, 0≤c≤0.040, α≥0, β≥0, and 0≤α+β≤0.50 are satisfied, when magnetic alloy is 100 wt %, P is 0.001 to 0.050 wt %, S is 0.001 to 0.050 wt %, and Ti is 0.001 to 0.080 wt %, and when a value obtained by dividing P by S is P/S, then P/S satisfies 0.10≤P/S≤10.

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：US20230420174A1

公开(公告)日：2023-12-28

申请号：US18339765

申请日：2023-06-22

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Satoko MORI ,  Hiroyuki MATSUMOTO

IPC: H01F27/255 ,  B22F1/052 ,  B22F1/08 ,  B22F1/16 ,  B22F9/08 ,  B22F3/24 ,  B22F3/02

CPC classification number: H01F27/255 ,  B22F1/052 ,  B22F1/08 ,  B22F1/16 ,  B22F9/082 ,  B22F3/24 ,  B22F3/02 ,  B22F2304/10 ,  B22F2301/35 ,  B22F2009/0824 ,  B22F2998/10 ,  B22F2003/248

Abstract: A magnetic core includes metal magnetic particles. A total area percentage of the metal magnetic particles in a cross section of the magnetic core is 75% or more and 90% or less. The metal magnetic particles include first particles whose Haywood diameters in the cross section of the magnetic core are 3 μm or more and second particles whose Haywood diameters in the cross section of the magnetic core are less than 3 μm. The second particles include two or more types of small particles with different compositions of films existing on their particle surfaces.

公开(公告)号：US20210134513A1

公开(公告)日：2021-05-06

申请号：US17082389

申请日：2020-10-28

Applicant: TDK CORPORATION

Inventor： Nobuhiro OKUDA ,  Hiroyuki MATSUMOTO ,  Kazuhiro YOSHIDOME

IPC: H01F27/255 ,  H01F1/153

Abstract: A magnetic core having a high relative permeability is obtained. The magnetic core contains soft magnetic metal powder particles. In a cross section of the magnetic core, a number ratio of soft magnetic metal powder particles having a circularity of less than 0.50 to a total number of soft magnetic metal powder particles having a particle size of 10 μm or more and less than 50 μm is 0.05% or more and 1.50% or less.