Method for manufacturing dust core and raw material powder for dust core
US11794244B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 10, 2018 |
| Grant date | Oct 24, 2023 |
| Priority date | — |
| Expiry date | Jan 18, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for manufacturing a dust core, including: a step of preparing a raw material powder including a coated pure iron powder composed of a plurality of pure iron particles each having an insulating coating layer, a coated iron alloy powder composed of a plurality of iron alloy particles each having an insulating coating layer, and a metal soap;a step of manufacturing a molded article by performing a compression molding of the raw material powder filled in a mold; and a step of performing a heat treatment of the molded article to eliminate distortions in the coated pure iron powder and the coated iron alloy powder, wherein a difference Tm−Td between a melting point Tm of the metal soap and a temperature Td of the mold in the step of manufacturing the molded article is greater than or equal to 90° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.