公开(公告)号：US12037668B2

公开(公告)日：2024-07-16

申请号：US17379666

申请日：2021-07-19

Applicant: Alps Alpine Co., Ltd.

Inventor： Akio Hanada ,  Koichi Fujita ,  Seiichi Abiko ,  Hisato Koshiba

IPC: C22C45/02 ,  B22F1/08 ,  B22F1/102 ,  B22F1/16 ,  B22F3/00 ,  B22F3/02 ,  B22F3/24 ,  H01F1/153 ,  H01F1/22 ,  H01F1/33 ,  H01F27/255 ,  H01F41/02

CPC classification number: C22C45/02 ,  B22F1/08 ,  B22F1/102 ,  B22F1/16 ,  B22F3/00 ,  B22F3/02 ,  B22F3/24 ,  H01F1/15308 ,  H01F1/22 ,  H01F1/33 ,  H01F27/255 ,  H01F41/0246 ,  B22F2003/248 ,  B22F2301/35 ,  B22F2998/10 ,  B22F2999/00 ,  B22F1/16 ,  C22C2200/02 ,  B22F2207/07

Abstract: A powder magnetic core containing a magnetic particle of an Fe-based Cr-containing amorphous alloy and an organic binding substance is provided as a powder magnetic core with a small loss and high initial permeability. The depth profile of the composition determined from the surface of the magnetic particle in the powder magnetic core has the following characteristics. (1) An oxygen-containing region with an O/Fe ratio of 0.1 or more can be defined from the surface of the magnetic particle, and the oxygen-containing region has a depth of 35 nm or less from the surface. (2) A carbon-containing region with a C/O ratio of 1 or more can be defined from the surface of the magnetic particle, and the carbon-containing region has a depth of 5 nm or less from the surface. (3) The oxygen-containing region has a Cr-concentrated portion with a bulk Cr ratio of more than 1.