Rare-earth magnet
US8119260B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2005 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Dec 26, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a ferromagnetic material containing at least one kind of rare-earth element, a layer containing at least one kind of alkaline earth element or rare-earth element and fluorine is formed at the grain boundary or near the powder surface of the ferromagnetic material. A further layer containing at least one kind of rare-earth element, having a fluorine concentration lower than that of the layer described first and having a rare-earth element concentration higher than that of the host phase of the ferromagnetic material, or an oxide layer containing a rare-earth element is formed in adjacent with a portion of the layer described first.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.