R.sub.2 Co.sub.17 Rare type-earth-cobalt, permanent magnet material and process for producing the same
US4213803A · kind A · utility
14Cited by
11References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1977 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Feb 8, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C19/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is the addition of at least two elements of Nb, V, Ta and Zr to the ternary alloy of R (rare earth)-Co-Cu for permanent magnet materials, to thereby provide the permanent magnets with increased coercive force, residual magnetization and energy product. The additional elements enable employment of such Cu and Fe contents of the alloy as less than 10% and more than 6%, respectively. These percentages were avoided in the prior art to prevent the reduction of Br and Hc, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.