公开(公告)号：US20220319748A1

公开(公告)日：2022-10-06

申请号：US17672373

申请日：2022-02-15

Applicant: TDK CORPORATION

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

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

Abstract: A soft magnetic alloy including an internal area having a soft magnetic type alloy composition including Fe and P (phosphorous), and
a P concentrated area existing closer to a surface side than the internal area and having a higher P concentration than in the internal area.

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：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：US20210098162A1

公开(公告)日：2021-04-01

申请号：US17028234

申请日：2020-09-22

Applicant: TDK Corporation

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

IPC: H01F1/153 ,  H01F1/20

Abstract: Provided is a soft magnetic alloy including a Fe-based nanocrystal and metallic glass. A differential scanning calorimetry curve of the soft magnetic alloy has a glass transition point Tg, a temperature rising rate of the soft magnetic alloy in measurement of the differential scanning calorimetry curve is 40 K/minute, and a temperature Tp of a maximum exothermic peak in the differential scanning calorimetry curve is higher than the Tg.

公开(公告)号：US20220328223A1

公开(公告)日：2022-10-13

申请号：US17697543

申请日：2022-03-17

Applicant: TDK CORPORATION

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

IPC: H01F1/153 ,  H01F1/20

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 Co concentration degree of the Co concentrated area is larger than 1.2.

公开(公告)号：US20220319749A1

公开(公告)日：2022-10-06

申请号：US17672258

申请日：2022-02-15

Applicant: TDK CORPORATION

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

IPC: H01F1/153 ,  C22C38/30 ,  C22C38/02 ,  C22C38/00

Abstract: A soft magnetic alloy comprising 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, 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, and a Fe concentrated area including Fe existing closer to the surface side than the SB concentrated area; wherein a crystalized area ratio of the SB concentrated area represented by SSBcry/SSB and a crystalized area ratio of the Fe concentrated area represented by SFecry/SFe, satisfy a relation of (SSBcry/SSB)

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：US20200312499A1

公开(公告)日：2020-10-01

申请号：US16829735

申请日：2020-03-25

Applicant: TDK CORPORATION

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

IPC: H01F1/153 ,  C22C45/02

Abstract: A soft magnetic alloy contains Fe as a main element and has an amorphous phase. On a differential scanning calorimetry curve of the soft magnetic alloy, a glass transition temperature Tg is found in a range from 350° C. to 600° C. and three or more exothermic peaks are found in a range from 350° C. to 850° C.