Permanent magnets
US5022939A · kind A · utility
41Cited by
1References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 1989 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | May 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0578
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet material having high coercivity and energy product is provided which contains rare earth elements, boron, at least one element of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, optional nickel, and a balance 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 has a specific relationship to other parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.