Permanent magnet with good thermal stability
US5223047A · kind A · utility
10Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Jun 4, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0578
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet having good thermal stability, consisting essentially of the composition represented by the general formula: EQU R(Fe.sub.1-x-y-z Co.sub.x B.sub.y Ga.sub.z).sub.A wherein R is Nd alone or one or more rare earth elements mainly composed of Nd, Pr or Ce, 0.ltoreq.x.ltoreq.0.7, 0.02.ltoreq.y.ltoreq.0.3, 0.001.ltoreq.z.ltoreq.0.15 and 4.0.ltoreq.A.ltoreq.7.5. This permanent magnet may contain one or more additional elements selected from Nb, W, V, Ta and Mo. This permanent magnet has high coercive force and Curie temperature and thus highly improved thermal stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.