Rare-earth iron-boron magnet containing cerium and lanthanum
US6261387A · kind A · utility
5Cited by
9References
67Claims
0Family size
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Inventor
Key dates
| Filing date | Sep 24, 1999 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Sep 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/057
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Permanent rare-earth magnets containing Ce are fabricated with coercivity greater than 4 kOe. One composition for such magnets is [Ce.sub.y R.sub.1-y ].sub.z (F.sub.1-v B.sub.v).sub.1-z, where R is one or more rare-earth elements, F is Fe or Fe--Co, and the relative elemental atomic composition is 0.0<y.ltoreq.0.3, 0.04.ltoreq.z.ltoreq.0.25, and 0.01.ltoreq.v.ltoreq.0.30. Another composition is [(Ce.sub.x La.sub.1-x).sub.y R.sub.1-y ].sub.z (F.sub.1-v B.sub.v).sub.1-z, with the relative elemental atomic composition x<0.4 or 0.9<x.ltoreq.1.0 and 0.2.ltoreq.y.ltoreq.0.8, 0.04.ltoreq.z.ltoreq.0.25, and 0.01.ltoreq.v.ltoreq.0.30.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.