Rare-earth alloy powders for magnets and process for making magnets from rare-earth alloy powders
US6136100A · kind A · utility
3Cited by
4References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1999 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Sep 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0575
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A process for passivating rare-earth alloy powders such that magnets formed from the powders have fewer expansion defects is described. By exposing the rare-earth alloy powders to a humid atmosphere, rare-earth oxide impurities that could result in eruptions in the magnets are reduced. Magnets made from the passivated powder show fewer expansion defects than magnets made from unpassivated powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.