Bonded Nd-Fe-B magnets without volumetric expansion defects
US6074492A · kind A · utility
3Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1997 |
| Grant date | Jun 13, 2000 |
| Priority date | — |
| Expiry date | Dec 30, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0578
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rare earth-iron-boron magnetic composition containing a rare earth fluoride compound in a sufficient amount to reduce or eliminate the formation of rare earth hydroxide and a method of making the same. The reduction or elimination of the formation of rare earth hydroxide substantially eliminates or significantly reduces eruptions in bonded magnets caused by volumetric expansion defects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.