公开(公告)号：US20230125339A1

公开(公告)日：2023-04-27

申请号：US17967687

申请日：2022-10-17

Applicant: TDK Corporation

Inventor： Akito HASEGAWA ,  Satoko MORI ,  Kazuhiro YOSHIDOME

IPC: H01F1/153 ,  H01F27/255

Abstract: A soft magnetic alloy includes a main body and a surface layer. The main body has a soft magnetic alloy composition including Fe and Co. The surface layer is located on a surface side of the main body. A ratio of Co concentration to a sum of Co concentration and Fe concentration in the surface layer is Co/(Fe+Co). A distribution of Co/(Fe+Co) in a thickness direction of the surface layer includes a local minimum point and one or more local maximum points.

公开(公告)号：US20220380875A1

公开(公告)日：2022-12-01

申请号：US17622526

申请日：2021-05-13

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Akito HASEGAWA ,  Hironobu KUMAOKA

IPC: C22C38/52 ,  C22C38/04 ,  C22C38/00 ,  H01F1/153 ,  H01F1/20

Abstract: A soft magnetic alloy and the like which simultaneously satisfy a high saturation magnetic flux density Bs and a high corrosion resistance. A soft magnetic alloy includes Mn and a component expressed by a compositional formula of ((Fe(1−(α+β))CoαNiβ)1−γX1γ)(1−(a+b+c+d+e))BaPbSicCdCre (atomic ratio). X1 is one or more selected from Ti, Zr, Hf, Nb, Ta, Mo, W, Al, Ga, Ag, Zn, S, Ca, Mg, V, Sn, As, Sb, Bi, N, O, Au, Cu, rare earth elements, and platinum group elements. Further, a to e and α to γ are within predetermined ranges. Mn amount f (at %) is within a range of 0.002≤f

公开(公告)号：US20220208423A1

公开(公告)日：2022-06-30

申请号：US17602157

申请日：2020-04-22

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Akito HASEGAWA ,  Hironobu KUMAOKA

IPC: H01F1/153 ,  C22C38/12 ,  C22C38/10 ,  C22C38/02 ,  C22C38/00 ,  B22F1/052

Abstract: A soft magnetic alloy powder which is a soft magnetic alloy powder having a low coercivity, and with which it is possible to obtain a green compact magnetic core having a high magnetic permeability. A soft magnetic alloy powder including a composition formula (Fe(1−(α+β))X1 αX2 β) (1−(a+b+c+d+e+f)) MaBbPcSidCeSf. XI is one or more elements selected from the group consisting of Co and Ni, X2 is one or more elements selected from the group consisting or Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O and rare earth elements, and M is one or more elements selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W, Ti and V. The amount of each component contained is within a specified range. The amorphous rate X (%) is at least 85%.

公开(公告)号：US20220062986A1

公开(公告)日：2022-03-03

申请号：US17411898

申请日：2021-08-25

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: B22F1/00 ,  H01F1/20 ,  B22F1/02 ,  B22F9/08

Abstract: To provide a magnetic core having a high permeability and a high voltage resistance while having a small variation in the voltage resistance.
The magnetic core includes the magnetic powder. A total area ratio of particles of the magnetic powder in a cross section of the magnetic core is 75% or more and 90% or less. An average circularity of large size particles is 0.70 or more when the large size particles are particles extracted from the particles of the magnetic powder in the cross section of the magnetic core in the order of size from the largest size until a cumulative area ratio of the extracted particles reaches a smallest area ratio exceeding 20% of the total area ratio of the particles of the magnetic powder.

公开(公告)号：US20210296031A1

公开(公告)日：2021-09-23

申请号：US17209725

申请日：2021-03-23

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: H01F1/147 ,  B22F1/00

Abstract: To obtain a magnetic core having an improved relative magnetic permeability and an improved withstand voltage property and the like. The magnetic core contains large particles observed as soft magnetic particles having a Heywood diameter of 5 μm or more and 25 μm or less and small particles observed as soft magnetic particles having a Heywood diameter of 0.5 μm or more and 3 μm or less in a cross section. 1.00≤A1≤1.50, 1.30≤A2≤2.50, and A1

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：US20210035719A1

公开(公告)日：2021-02-04

申请号：US16939378

申请日：2020-07-27

Applicant: TDK Corporation

Inventor： Satoko MORI ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: H01F1/153

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 an oxide of at least one kind of element selected from the group consisting of Fe, Si, and B, and at least one kind of element of Ca and Mg. A concentration of Ca or Mg in the metal particle and the oxidized part is maximum in the oxidized part. An average value of a maximum value of the concentration of Ca or Mg in the oxidized part is 0.2 atom % or more.

公开(公告)号：US20200306831A1

公开(公告)日：2020-10-01

申请号：US16829074

申请日：2020-03-25

Applicant: TDK CORPORATION

Inventor： Satoko MORI ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: B22F1/02 ,  H01F1/147 ,  B22F9/08 ,  C22C38/16 ,  C22C38/12 ,  C22C38/02 ,  C22C38/00 ,  H01F1/153

Abstract: A soft magnetic metal powder that has low coercivity Hcj and high saturation magnetic flux density Bs, and has high powder resistivity and high insulating performance is obtained. The soft magnetic metal powder is soft magnetic metal powder containing Fe. The soft magnetic metal powder has particles each including a soft magnetic metal portion and a coating portion coating the soft magnetic metal portion. The coating portion includes a first coating portion and a second coating portion. The first coating portion is closer to the soft magnetic metal portion than the second coating portion. The first coating portion and the second coating portion have oxides containing at least one element selected from Si, Fe, and B as a main component. The first coating portion includes amorphous material, the second coating portion includes crystals, and the second coating portion has a higher crystal content ratio than the first coating portion.

公开(公告)号：US20190214171A1

公开(公告)日：2019-07-11

申请号：US16221977

申请日：2018-12-17

Applicant: TDK CORPORATION

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

IPC: H01F1/26 ,  H01F1/147 ,  H01F1/38

CPC classification number: H01F1/26 ,  H01F1/14708 ,  H01F1/14766 ,  H01F1/15308 ,  H01F1/15333 ,  H01F1/38 ,  H01F41/0226 ,  H01F41/0246

Abstract: A soft magnetic alloy which includes nanocrystal parts and amorphous parts is provided. The nanocrystal parts include αFe(—Si) as a main component, and include at least one of elements selected from B, P, C, Ti, Zr, Hf, Nb, Ta, Mo, V, W, Cr, Al, Mn, Zn, and Cu as a sub-component. When a total content ratio of the sub-component in the nanocrystal parts is set as α (at %), and a total content ratio of the sub-components of the nanocrystal parts included in the amorphous parts is set as β (at %), 0.01≤(α/β)≤0.40, and a crystallinity degree is 5% or more and 70% or less.

公开(公告)号：US20190108931A1

公开(公告)日：2019-04-11

申请号：US16146268

申请日：2018-09-28

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: H01F1/147 ,  C22C38/14 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12

Abstract: A soft magnetic alloy contains a main component having a composition formula of (Fe(1−(α−β))X1αX2β)1−(a+b+c+d))MaBbPcCd and auxiliary components including at least Ti, Mn and Al. In the composition formula, 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 Ag, Zn, Sn, As, Sb, Bi and a rare earth element, and M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W and V. In the composition formula, 0.030≤a≤0.100, 0.050≤b≤0.150, 0≤c≤0.030, 0≤d≤0.030, α≥0, β≥0, and 0≤α+β≤0.50 are satisfied. In the soft magnetic alloy, a content of Ti is 0.001 to 0.100 wt %, a content of Mn is 0.001 to 0.150 wt %, and a content of Al is 0.001 to 0.100 wt %.