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：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：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：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 %.

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：US20230130266A1

公开(公告)日：2023-04-27

申请号：US17968627

申请日：2022-10-18

Applicant: TDK CORPORATION

Inventor： Akito HASEGAWA ,  Satoko MORI ,  Kazuhiro YOSHIDOME

IPC: H01F1/153 ,  C22C45/02

Abstract: A soft magnetic alloy powder includes a particle body and a surface layer. The particle body comprises a soft magnetic alloy including Fe and Co. The surface layer is located on a surface side of the particle body. The surface layer includes one or more local maximum points of Si concentration and one or more local maximum points of Co concentration. The surface layer satisfies DSi≤DCo, in which DSi is a distance from an interface between the particle body and the surface layer to a first Si local maximum point LSimax, and DCo is a distance from the interface to a first Co local maximum point LComax.

公开(公告)号：US20220328222A1

公开(公告)日：2022-10-13

申请号：US17672441

申请日：2022-02-15

Applicant: TDK CORPORATION

Inventor： Hironobu KUMAOKA ,  Kazuhiro YOSHIDOME ,  Akito HASEGAWA ,  Satoko MORI

IPC: H01F1/153 ,  C22C38/02 ,  C22C45/02

Abstract: A soft magnetic alloy including an internal area having a soft magnetic type alloy composition including Fe and Co, a Co concentrated area existing closer to a surface side than the internal area and having a higher Co concentration than in the internal area, and a SB concentrated area existing closer to the surface side than the Co concentrated area and having a higher concentration of at least one element selected from Si and B than in the internal area.

公开(公告)号：US20190355498A1

公开(公告)日：2019-11-21

申请号：US16413848

申请日：2019-05-16

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Satoko MORI ,  Masakazu HOSONO ,  Yoshiki KAJIURA

IPC: H01F1/153 ,  H01F1/147 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C22C38/16

Abstract: Disclosed is a soft magnetic powder including a main component represented by composition formula: (Fe(1-(α+β))X1αX2β)(1-(a+b+c+d+e+f))MaBbPcSidCeSf. X1 represents one or more selected from the group consisting of Co and Ni; X2 represents one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, and rare earth elements; and M represents one or more selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W, Ti, and V. The following relations are satisfied: 0≤a≤0.140; 0.020

公开(公告)号：US20190279797A1

公开(公告)日：2019-09-12

申请号：US16296394

申请日：2019-03-08

Applicant: TDK CORPORATION

Inventor： Takuma NAKANO ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Satoko MORI ,  Seigo TOKORO ,  Kenji HORINO

IPC: H01F1/153 ,  H01F1/147

Abstract: Soft magnetic metal powder which includes a plurality of soft magnetic metal particles configured by a Fe-based nanocrystal alloy including Cu is provided, wherein the soft magnetic metal particles have core portions and first shell portions surrounding circumferences of the core portions; when an average crystallite size of Cu crystallites existing in the core portions is set as A, and the largest crystallite size of Cu crystallites existing in the first shell portions is set as B, B/A is 3.0 or more and 1000 or less