Permanent magnets
US5049208A · kind A · utility
62Cited by
2References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1988 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jul 29, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0578
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet having high coercivity and energy product contains rare earth elements, boron, at least one element of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, and a blance of Fe or Fe and Co, and consists of a primary phase of substantially tetragonal grain structure, or a mixture of such a primary phase and an amorphous or crystalline rare earth element-poor auxiliary phase wherein the volume ratio of auxiliary phase to primary phase is smaller than a specific value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.