Compact, electromagnetic component, and method for producing compact
US11101058B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 24, 2016 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | Apr 19, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2003/106
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A compact is provided. When the compact is used for a magnetic core, a magnetic path cross section has a cross-sectional perimeter of more than 20 mm, and at least part of a surface of the compact is covered with an iron-based oxide film having an average thickness of 0.5 μm or more and 10.0 μm or less. Letting the proportion of the surface area of the compact to the volume of the compact be surface area/volume, the content of Fe3O4 present in the iron-based oxide film with respect to 100% by volume of the compact satisfies any one of (1) to (3): (1) less than 0.085% by volume when the (surface area/volume) is 0.40 mm−1 or less, (2) 0.12% or less by volume when the (surface area/volume) is more than 0.40 mm−1 and 0.60 mm−1 or less, and (3) 0.15% or less by volume when the (surface area/volume) is more than 0.60 mm−1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.