Ferrite powder coating insulating layer for molding a powder metal core
US6689183B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 9, 2001 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Jan 9, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/0246
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A composition of metal powder for powder metallurgy applications comprising an iron-based powder metal admixed with a minority fraction of a ferrite powder having a lesser particle-size distribution. The ferrite particles are associated with an exterior surface of the iron-based particles and, after compression molding by a powder metallurgy technique, are incorporated into the microstructural pores between adjacent particles of iron-based powder. A composite structure formed from the composition of the present invention has an improved overall permeability and overall resistivity. A binder, such as a thermoplastic polyacrylate, may be added to the admixture of iron-based and ferrite powders for promoting the association of the ferrite powder with the iron-based powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.