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    Method for manufacturing powder magnetic core
    1.
    发明授权
    Method for manufacturing powder magnetic core 有权

    公开(公告)号：US11192183B2

    公开(公告)日：2021-12-07

    申请号：US15759550

    申请日：2016-09-16

    Applicant: HITACHI METALS, LTD.

    Inventor： Tetsuroh Katoh ,  Kazunori Nishimura ,  Shin Noguchi

    IPC: B22F3/24 ,  H01F41/02 ,  H01F1/147 ,  B22F1/02 ,  C22C38/18 ,  C22C38/06

    Abstract: A powder magnetic core manufacturing method includes: a first step of mixing a binder with a soft magnetic material powder containing Fe-M (M: Al or Cr)-based alloy particles on which an insulating layer is formed; a second step of filling a pressing die with a mixture obtained through the first step, subjecting the mixture to pressing to obtain a green compact, and slidingly demolding the green compact from the pressing die; a third step of processing the green compact after the second step and removing expansion deformed matter of the alloy particles present in a region of pressing flaws formed on a surface of the green compact during the slidingly demolding; and a fourth step of subjecting the green compact after the third step to heat treatment to oxidize surfaces of the Fe-M (M: Al or Cr)-based alloy particles at high temperature, so that the oxide phase is formed.

    Magnetic core and coil component
    4.
    发明授权
    Magnetic core and coil component 有权

    公开(公告)号：US10586646B2

    公开(公告)日：2020-03-10

    申请号：US16333091

    申请日：2017-09-15

    Applicant: HITACHI METALS, LTD.

    Inventor： Toshio Mihara ,  Tetsuroh Katoh ,  Kazunori Nishimura ,  Shin Noguchi

    IPC: H01F27/29 ,  H01F27/24 ,  H01F1/055 ,  H01F27/28 ,  H01F1/33 ,  B22F1/00 ,  H01F37/00 ,  H01F27/255 ,  B22F1/02 ,  C22C38/00 ,  H01F1/24 ,  H01F1/147 ,  B22F3/00

    Abstract: A magnetic core has a high initial permeability and a small core loss, reducing a core loss at high frequencies; and a coil component including the same. This magnetic core is formed by binding a plurality of Fe-based alloy particles containing Al via an oxide layer containing an Fe oxide. In an X-ray diffraction spectrum of the magnetic core measured using Cu-Kα characteristic X-rays, a peak intensity ratio (P1/P2) of peak intensity P1 of a diffraction peak derived from the Fe oxide having a corundum structure appearing in the vicinity of 2θ=33.2° to peak intensity P2 of a diffraction peak derived from the Fe-based alloy having a bcc structure appearing in the vicinity of 2θ=44.7° is 0.010 or less (excluding 0). A superlattice peak intensity of an Fe3Al ordered structure is at most a noise level within a range of 2θ=20° to 40°.

    Magnetic core and coil component
    5.
    发明授权
    Magnetic core and coil component 有权

    公开(公告)号：US10468174B2

    公开(公告)日：2019-11-05

    申请号：US16333132

    申请日：2017-09-15

    Applicant: HITACHI METALS, LTD.

    Inventor： Toshio Mihara ,  Tetsuroh Katoh ,  Kazunori Nishimura ,  Shin Noguchi

    IPC: H01F27/28 ,  H01F27/255 ,  B22F1/00 ,  C22C38/00 ,  H01F1/147 ,  H01F1/24 ,  H01F1/33 ,  H01F17/04

    Abstract: Provided are a magnetic core having a high initial permeability and a coil component including the same. The magnetic core has an X-ray diffraction spectrum of the magnetic core measured using Cu-Kα characteristic X-rays, wherein a peak intensity ratio (P1/P2) of a peak intensity P1 of a diffraction peak of an Fe oxide having a corundum structure appearing in a vicinity of 2θ=33.2° to a peak intensity P2 of a diffraction peak of the Fe-based alloy having a bcc structure appearing in a vicinity of 2θ=44.7° is 0.015 or less; and in the X-ray diffraction spectrum, a peak intensity ratio (P3/P2) of a peak intensity P3 of a superlattice peak of an Fe3Al ordered structure appearing in a vicinity of 2θ=26.6° to the peak intensity P2 is 0.015 or more and 0.050 or less.

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