公开(公告)号：US20250066889A1

公开(公告)日：2025-02-27

申请号：US18724660

申请日：2022-08-31

Applicant: TDK CORPORATION

Inventor： Kensuke ARA ,  Hajime AMANO ,  Kazuhiro YOSHIDOME ,  Takuya TSUKAHARA

IPC: C22C38/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/30 ,  C22C38/32

Abstract: This soft magnetic alloy contains Fe, Co, and at least one selected from among M and X. M is at least one selected from among Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W. X is at least one selected from among Si, B, C and P. A volume ratio of a portion in which both the content of Fe and the total content of M and X fall within specific ranges have a specific relationship with a volume ratio of a portion in which both the content of Co and the total content of M and X fall within specific ranges

公开(公告)号：US20240047109A1

公开(公告)日：2024-02-08

申请号：US18358513

申请日：2023-07-25

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Kensuke ARA

IPC: H01F3/08

CPC classification number: H01F3/08

Abstract: Provided is a magnetic core in which metal magnetic particles occupy an area of 75% to 90% on a cross-section. The metal magnetic particles include first large particles having a crystalline metal material and having a Heywood diameter of 3 μm or more on the cross-section of the magnetic core, and second large particles having a nanocrystal structure or an amorphous structure and having a Heywood diameter of 3 μm or more, and an insulation coating of the first large particles is thicker than an insulation coating of the second large particles.

公开(公告)号：US20210062308A1

公开(公告)日：2021-03-04

申请号：US16643981

申请日：2018-05-17

Applicant: TDK CORPORATION

Inventor： Akihiro HARADA ,  Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Kazuhiro YOSHIDOME ,  Akito HASEGAWA ,  Hajime AMANO ,  Kensuke ARA ,  Seigo TOKORO ,  Masakazu HOSONO ,  Takuma NAKANO ,  Satoko MORI

IPC: C22C38/16 ,  H01F1/153 ,  C22C38/02 ,  C22C38/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/10 ,  C22C38/08

Abstract: Provided is a soft magnetic alloy having a composition of a compositional formula (Fe(1−(α+β))X1αX2β)(1−(a+b+c+d+e))PaCbSicCudMe. X1 is one or more selected from a group consisting of Co and Ni, X2 is one or more selected from a group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, 0, and rare earth elements, and M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, W and V. 0.050≤a≤0.17, 0

公开(公告)号：US20190221342A1

公开(公告)日：2019-07-18

申请号：US16244633

申请日：2019-01-10

Applicant: TDK CORPORATION

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

IPC: H01F1/153 ,  H01F1/147

CPC classification number: H01F1/15308 ,  C22C38/42 ,  C22C45/02 ,  H01F1/147 ,  H01F1/153 ,  H01F1/15333 ,  H01F41/02 ,  H01F41/0226 ,  H01F41/0246

Abstract: A soft magnetic alloy includes a main component of (Fe(1−(α+β))X1αX2β)(1−(a+b+c+d+e))MaBbPcSidCe. X1 is one or more of Co and Ni. X2 is one or more of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O, and rare earth elements. M is one or more of Nb, Hf, Zr, Ta, Mo, W, and V. 0.020≤a≤0.14 is satisfied. 0.020

公开(公告)号：US20250140459A1

公开(公告)日：2025-05-01

申请号：US18931356

申请日：2024-10-30

Applicant: TDK CORPORATION

Inventor： Kensuke ARA ,  Kazuhiro Yoshidome

IPC: H01F1/20 ,  C22C38/02 ,  C22C38/10 ,  C22C38/30 ,  H01F27/255

Abstract: A soft magnetic powder including a soft magnetic particle containing at least one selected from the group consisting of iron and cobalt: when the soft magnetic particle satisfies the relation of σFeCo(S)−σFeCo(C)≤−0.005, when an element distribution is divided into multiple grids to calculate a sum of content ratios of iron and cobalt in each grid, and a standard deviation of the sum of the content ratios is represented by σFeCo(S) where a population is the grids, and an element distribution is divided into multiple grids to calculate a sum of content ratios of iron and cobalt in each grid, and a standard deviation of the sum of the content ratios is represented by σFeCo(C) where a population is the multiple grids.

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：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：US20240177902A1

公开(公告)日：2024-05-30

申请号：US18358191

申请日：2023-07-25

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Kensuke ARA

IPC: H01F1/20 ,  B22F1/052 ,  B22F1/08 ,  B22F1/103 ,  B22F1/142 ,  B22F1/16 ,  B22F3/02 ,  B22F3/24 ,  B22F9/08

CPC classification number: H01F1/20 ,  B22F1/052 ,  B22F1/08 ,  B22F1/103 ,  B22F1/142 ,  B22F1/16 ,  B22F3/02 ,  B22F3/24 ,  B22F9/082 ,  B22F2003/248 ,  B22F2009/0824 ,  B22F2301/35 ,  B22F2304/10 ,  B22F2998/10

Abstract: Provided is a magnetic core containing metal magnetic particles. A total area ratio occupied by the metal magnetic particles on a cross-section of the magnetic core is 75% or more. The metal magnetic particles include first large particles having an amorphous structure and having a Heywood diameter of 3 μm or more on the cross-section of the magnetic core, and second large particles having a nanocrystal structure and having a Heywood diameter of 3 μm or more on the cross-section of the magnetic core. An insulation coating of the first large particles is thicker than an insulation coating of the second large particles.

公开(公告)号：US20240038433A1

公开(公告)日：2024-02-01

申请号：US18358433

申请日：2023-07-25

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Kensuke ARA

IPC: H01F27/255 ,  H01F1/24

CPC classification number: H01F27/255 ,  H01F1/24 ,  H01F41/0246

Abstract: Provided is a magnetic core in which metal magnetic particles occupy an area of 75% to 90% on a cross-section. The metal magnetic particles include first large particles having a nanocrystal structure and having a Heywood diameter of 3 μm or more on the cross-section of the magnetic core, and second large particles having an amorphous structure and having a Heywood diameter of 3 μm or more, and an insulation coating of the first large particles is thicker than an insulation coating of the second large particles.