Production process of dust core and dust core obtained thereby
US8323422B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2011 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Nov 22, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a dust core excellent in flux density, iron loss, and mechanical strength.A production process of a dust core according to the invention includes a step of compacting a mixture obtained by mixing an iron-based soft magnetic powder for powder compact having a phosphate conversion coating film on the surface of an iron-based soft magnetic powder with a lubricant to obtain a powder compact, a heat treatment step of heating the resulting powder compact at 550° C. or more but not more than 650° C. in an inert atmosphere, and a heat treatment step of heating the heat-treated powder compact at 420° C. or more but not more than 530° C. in an oxidizing atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.