Iron-based soft magnetic powder for dust core, preparation process thereof, and dust core
US9275779B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2011 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Aug 12, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is an iron-based soft magnetic powder for dust core having a less coercive force, which is obtained by specifying the amount of inclusions in the iron-based powder for dust core, and at the same time, capable of decreasing the coercive force of a dust core produced using the iron-based soft magnetic powder. The iron-based soft magnetic powder for dust core is characterized by that when the cross-section of the iron-based soft magnetic powder particle is observed with a scanning electron microscope, the number of inclusions having an equivalent circle diameter from 0.1 to 3 μm is 1×104 pieces/mm2 or less and the number of inclusions having an equivalent circle diameter exceeding 3 μm is 10 pieces/mm2 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.