公开(公告)号：US20190237229A1

公开(公告)日：2019-08-01

申请号：US16260715

申请日：2019-01-29

Applicant: TDK CORPORATION

Inventor： Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Kenji HORINO ,  Akito HASEGAWA ,  Syota GOTO ,  Masakazu HOSONO ,  Hajime AMANO ,  Isao NAKAHATA

IPC: H01F1/147 ,  C22C38/12 ,  C22C38/00 ,  B22D23/00 ,  C21D9/52 ,  C21D6/00

CPC classification number: H01F1/14733 ,  B22D23/003 ,  B22F1/00 ,  B22F3/00 ,  C21D1/26 ,  C21D1/30 ,  C21D6/00 ,  C21D6/001 ,  C21D6/007 ,  C21D6/008 ,  C21D8/1255 ,  C21D9/46 ,  C21D9/52 ,  C21D2201/03 ,  C22C33/02 ,  C22C33/0214 ,  C22C33/0257 ,  C22C33/0264 ,  C22C33/0271 ,  C22C33/0278 ,  C22C33/0285 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/08 ,  C22C38/10 ,  C22C38/105 ,  C22C38/12 ,  C22C38/16 ,  C22C38/40 ,  C22C38/52 ,  C22C45/008 ,  C22C45/02 ,  C22C45/04 ,  C22C2200/02 ,  C22C2200/04 ,  C22C2202/02 ,  H01F1/147 ,  H01F1/14716 ,  H01F1/14766 ,  H01F1/14775 ,  H01F1/14791 ,  H01F1/15308 ,  H01F1/15333

Abstract: A soft magnetic alloy has a main component of Fe. The soft magnetic alloy contains P. A Fe-rich phase and a Fe-poor phase are contained. An average concentration of P in the Fe-poor phase is 1.5 times or larger than an average concentration of P in the soft magnetic alloy by number of atoms.

公开(公告)号：US20230085009A1

公开(公告)日：2023-03-16

申请号：US17893502

申请日：2022-08-23

Applicant: TDK CORPORATION

Inventor： Kyotaro ABE ,  Isao NAKAHATA ,  Takuya TSUKAHARA

IPC: H01F1/153 ,  C22C45/02 ,  H01F3/04

Abstract: A specific depth at which a concentration of Fe reaches 10 at % is 18 nm or more and 500 nm or less from the first surface, and from the first surface to the specific depth, the concentration of Fe is less than 10 at %, and a positive increase region is present in which the concentration of Fe increases with a substantially positive concentration gradient, in a case where the concentration of Fe is measured in a depth direction from a first surface of a ribbon.

公开(公告)号：US20230079841A1

公开(公告)日：2023-03-16

申请号：US17893463

申请日：2022-08-23

Applicant: TDK CORPORATION

Inventor： Kyotaro ABE ,  Isao NAKAHATA ,  Takuya TSUKAHARA

IPC: H01F1/153 ,  C22C45/02 ,  H01F3/04 ,  H01F41/02

Abstract: Provided a soft magnetic alloy ribbon containing Fe and B. Convex portions having an average convex portion height of 7 nm to 130 nm are present on an alloy surface.

公开(公告)号：US20220328224A1

公开(公告)日：2022-10-13

申请号：US17702972

申请日：2022-03-24

Applicant: TDK CORPORATION

Inventor： Takuya TSUKAHARA ,  Isao NAKAHATA ,  Kazuhiro YOSHIDOME

IPC: H01F1/153 ,  C22C38/16 ,  C22C38/12 ,  C22C38/02 ,  C22C45/02

Abstract: To provide a soft magnetic alloy or the like, from which a magnetic component having a good temperature property of core loss can be obtained. The soft magnetic alloy includes Fe. The soft magnetic alloy includes a crystallite, and an amorphous phase existing around the crystallite. A total area ratio of the crystallite in a cross section of the soft magnetic alloy is 40% or more and less than 60%. An average thickness of the amorphous phase is 3.0 nm or more and 10.0 nm or less. A standard deviation of a thickness of the amorphous phase is 10.0 nm or less.

公开(公告)号：US20210159001A1

公开(公告)日：2021-05-27

申请号：US16952770

申请日：2020-11-19

Applicant: TDK CORPORATION

Inventor： Takuya TSUKAHARA ,  Isao NAKAHATA ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO

IPC: H01F1/153 ,  C22C38/02 ,  C22C38/00 ,  C22C38/12

Abstract: A soft magnetic alloy ribbon having high corrosion resistance is obtained. The soft magnetic alloy ribbon contains Fe, P, and Si. A maximum point of a concentration of P and a maximum point of a concentration of Si including in oxides is present in a region within 20 nm from the surface, when a concentration distribution of an element contained in the soft magnetic alloy ribbon is measured from a surface toward an interior of the soft magnetic alloy ribbon in a thickness direction.

公开(公告)号：US20210005364A1

公开(公告)日：2021-01-07

申请号：US16977738

申请日：2019-03-01

Applicant: TDK CORPORATION

Inventor： Isao NAKAHATA ,  Kazuhiro YOSHIDOME ,  Hiroyuki MATSUMOTO ,  Akito HASEGAWA

IPC: H01F1/153 ,  H01F41/02 ,  H01F27/25

Abstract: A magnetic core and the like having a stable soft magnetic property, including a plurality of soft magnetic layers which are laminated, wherein a crack is formed in the soft magnetic layers. The soft magnetic layers include Fe as a principal component. The soft magnetic layers include a composition formula (Fe(1−(α+β))X1αX2β)(1−(a+b+c+d+e+f))MaBbPcSidCeSf, wherein: 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 Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, and O and rare-earth elements, M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Mo, V, and W; and a to f and α and β are in predetermined ranges. A structure including a nanoheterostructure or an Fe-group nanocrystal is observed in the soft magnetic layers.