公开(公告)号：US20180247744A1

公开(公告)日：2018-08-30

申请号：US15904986

申请日：2018-02-26

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Akito HASEGAWA ,  Yu YONEZAWA ,  Syota GOTO ,  Seigo TOKORO

IPC: H01F1/153 ,  C22C45/02

CPC classification number: H01F1/1535 ,  C22C33/003 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C45/02 ,  C22C2200/02 ,  C22C2202/02 ,  H01F1/15308 ,  H01F41/0226 ,  H01F41/0246

Abstract: Provided is a soft magnetic alloy including Fe as a main component, in which a slope of an approximate straight line, plotted between cumulative frequencies of 20 to 80% on Fe content in each grid of 80000 grids or more, each of which has 1 nm×1 nm×1 nm, is −0.1 to −0.4, provided that Fe content (atom %) of each grid is Y axis, and the cumulative frequencies (%) obtained in descending order of Fe content in each grid is X axis, and an amorphization ratio X is 85% or more.

公开(公告)号：US20250140455A1

公开(公告)日：2025-05-01

申请号：US18930358

申请日：2024-10-29

Applicant: TDK CORPORATION

Inventor： Akito HASEGAWA ,  Yoshiki Kajiura ,  Kazuhiro Yoshidome

IPC: H01F1/147 ,  C22C38/00 ,  C22C38/02 ,  C22C38/30 ,  H01F27/255

Abstract: A magnetic core includes soft magnetic particles. Large particles denote soft magnetic particles having a particle size of (0.5×D50) or more in a volume-based particle size distribution of the soft magnetic particles. M is within a specific range, where M denotes a median of AL of the large particles, and AL denotes an average distance from one of the large particles to three of the large particles nearest to the one of the large particles.

公开(公告)号：US20250140454A1

公开(公告)日：2025-05-01

申请号：US18930236

申请日：2024-10-29

Applicant: TDK CORPORATION

Inventor： Yoshiki KAJIURA ,  Akito HASEGAWA ,  Kazuhiro YOSHIDOME

IPC: H01F1/147 ,  C22C38/00 ,  C22C38/02 ,  C22C38/30 ,  H01F27/255

Abstract: A magnetic core includes soft magnetic particles. The soft magnetic particles include large particles having a particle size of (0.5×V50) or more and small particles having a particle size of (2×N50) or less, where V10 denotes D10 of a volume-based particle size distribution of the soft magnetic particles, V50 denotes D50 of the volume-based particle size distribution of the soft magnetic particles, and N50 denotes D50 of a number-based particle size distribution of the soft magnetic particles. L50 is within a specific range, where L50 denotes a median of L of the small particles, and L denotes a distance from one of the small particles to one of the large particles nearest to the one of the small particles.

公开(公告)号：US20240145134A1

公开(公告)日：2024-05-02

申请号：US18175139

申请日：2023-02-27

Applicant: TDK CORPORATION

Inventor： Toshiki GUSHI ,  Kazuhiro YOSHIDOME ,  Akito HASEGAWA ,  Isao KANADA

IPC: H01F1/00 ,  G01N27/72

CPC classification number: H01F1/0054 ,  G01N27/72

Abstract: A polymer particle containing magnetic material includes a core and a polymer layer. The core includes magnetic fine particles. The polymer layer is located outside the core and surrounds the core. A shape ratio (Ric) is defined in each of the magnetic fine particles by dividing a diameter (Di) of an inscribed circle of the magnetic fine particle by a diameter (Do) of a circumscribed circle of the magnetic fine particle. The shape ratio (Ric) of the magnetic fine particle is 0.50 or more and 0.94 or less. The diameter (Di) of the magnetic fine particle is 5 nm or more. The diameter (Di) and the shape ratio (Ric) of the magnetic fine particle satisfy a relation formula of Di≤9.28×e{circumflex over ( )}(1.17×Ric).

公开(公告)号：US20240071663A1

公开(公告)日：2024-02-29

申请号：US18458597

申请日：2023-08-30

Applicant: TDK CORPORATION

Inventor： Masakazu HOSONO ,  Kazuhiro YOSHIDOME ,  Akito HASEGAWA ,  Yoshiki KAJIURA

IPC: H01F1/20 ,  B22F1/052 ,  B22F1/06 ,  B22F1/142 ,  B22F3/02 ,  B22F3/24 ,  B22F5/10 ,  B22F9/00 ,  B22F9/08 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/16 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34

CPC classification number: H01F1/20 ,  B22F1/052 ,  B22F1/06 ,  B22F1/142 ,  B22F3/02 ,  B22F3/24 ,  B22F5/106 ,  B22F9/007 ,  B22F9/082 ,  C22C33/04 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/105 ,  C22C38/12 ,  C22C38/16 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  H01F27/255

Abstract: A soft magnetic alloy powder comprises first particles to fifth particles, each having a particle size within a specific range. Among the first particles to the fifth particles, nth particles have an average particle size xn (μm), an average circularity yn, and a variance zn of circularity, where nth is any ordinal number from first to fifth. Points (xn, yn) (n=1 to 5) plotted in an xy plane define an approximate straight line having a slope “my” of −0.0030 or more. Points (xn, zn) (n=1 to 5) plotted in an xz plane define an approximate straight line having a slope “mz” of 0.00050 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：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：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 %.