Soft magnetic powder, method for producing same, and dust core using soft magnetic powder
US11270821B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2018 |
| Grant date | Mar 8, 2022 |
| Priority date | — |
| Expiry date | Feb 16, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/15383
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A soft magnetic powder that can exhibit desirable soft magnetic characteristics. A dust core using the soft magnetic powder is also provided. The soft magnetic powder includes: a soft magnetic powder layer of an unoxidized soft magnetic material; a second oxide layer as an oxide with iron or boron residing around the soft magnetic powder layer; and a first oxide layer of an iron oxide residing around the second oxide layer. The first oxide layer and the second oxide layer reside in a region of 20 nm or more and 500 nm or less from a surface of the soft magnetic powder, and are absent in a region of more than 500 nm and 1,600 nm or less from the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.