公开(公告)号：US20240071660A1

公开(公告)日：2024-02-29

申请号：US18458639

申请日：2023-08-30

Applicant: TDK CORPORATION

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

IPC: H01F1/147 ,  H01F3/08

CPC classification number: H01F1/14758 ,  H01F3/08

Abstract: A soft magnetic alloy powder comprises a component having a compositional formula ((Fe(1−(α+β))CoαNiβ)(1−γ)X1γ)(1−(a+b+c+d+e))BaPbSicCdCre in atomic ratio. X1 comprises at least one selected from specific elements. Values of a, b, c, d, e, α, β, and γ of the compositional formula satisfy specific ranges. The soft magnetic alloy powder comprises soft magnetic alloy particles including soft magnetic alloy particles having a particle size of (0.95×D90) or more and (1.05×D90) or less. An average Wadell's circularity of the soft magnetic alloy particles having the particle size of (0.95×D90) or more and (1.05×D90) or less is 0.75 or more. A variance of Wadell's circularity of the soft magnetic alloy particles having the particle size of (0.95×D90) or more and (1.05×D90) or less is 0.035 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：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：US20230095146A1

公开(公告)日：2023-03-30

申请号：US17944834

申请日：2022-09-14

Applicant: TDK CORPORATION

Inventor： Masakazu HOSONO ,  Kazuhiro YOSHIDOME ,  Yoshiki KAJIURA ,  Hiroyuki MATSUMOTO

IPC: B22F9/08

Abstract: A metal powder producing apparatus includes a molten metal supply unit, a cylinder body, and a cooling liquid introduction unit. The molten metal supply unit discharges a molten metal. The cylinder body is capable of being formed with a layer of a cooling liquid for cooling the molten metal on an inner circumference surface of the cylinder body. The cooling liquid introduction unit supplies the cooling liquid to an upper inside of the cylinder body. The inner circumference surface of the upper inside of the cylinder body has a substantially elliptical shape.

公开(公告)号：US20210230720A1

公开(公告)日：2021-07-29

申请号：US17119033

申请日：2020-12-11

Applicant: TDK CORPORATION

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

IPC: C22C19/07 ,  H01F1/153 ,  B22F1/00

Abstract: A soft magnetic alloy powder has a specific composition in which a Co content is large. A soft magnetic alloy powder has a glass transition point Tg and a melting point Tm, 900° C.≤Tm≤1200° C. is satisfied, or when coercivity when applying a pressure XP to a soft magnetic alloy powder is set as YH, and a straight line obtained by linearly approximating a relationship between XP and YH by a method of least squares is set as YH=kXP+1, k (unit: Oe/MPa) satisfies 0≤k≤0.00100.

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：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.