Invention Grant
- Patent Title: Insulating material-coated soft magnetic powder, dust core, magnetic element, electronic device, and moving body
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Application No.: US17745912Application Date: 2022-05-17
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Publication No.: US11901101B2Publication Date: 2024-02-13
- Inventor: Atsushi Nakamura
- Applicant: Seiko Epson Corporation
- Applicant Address: JP Tokyo
- Assignee: Seiko Epson Corporation
- Current Assignee: Seiko Epson Corporation
- Current Assignee Address: JP Tokyo
- Agency: Harness, Dickey & Pierce, P.L.C.
- Priority: JP 21084093 2021.05.18
- Main IPC: H01F1/147
- IPC: H01F1/147 ; H01F1/24 ; B22F1/16 ; C22C38/02 ; G11B5/66 ; C22C1/08 ; C22C1/10 ; C22C33/02 ; H01F1/20 ; H01F1/28 ; H01F17/06 ; H01F27/28 ; B22F3/02 ; H01F27/24 ; H01F1/33 ; B22F1/142 ; B22F1/00 ; B22F9/08 ; B22F1/05 ; B22F3/10 ; B22F1/052 ; H01F3/08 ; H01F1/18 ; H01F27/255 ; H01F17/04 ; B22F9/04

Abstract:
An insulating material-coated soft magnetic powder includes: a core particle that includes a base portion containing a soft magnetic material containing Fe as a main component and at least one of Si, Cr, and Al, and that includes an oxide film provided on a surface of the base portion and containing an oxide of at least one of Si, Cr, and Al; and an insulating film that is provided on a surface of the core particle and that contains a ceramic, in which a thickness of the insulating film is 5 nm or more and 300 nm or less, and the oxide contained in the oxide film and the ceramic contained in the insulating film are mutually diffused at an interface between the oxide film and the insulating film.
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