Permanent magnet materials
US3977917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1974 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | Jul 31, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Samarium cobalt magnetic materials for permanent magnets comprising, by atomic ratio relative to the samarium content, samarium of 1, cobalt of 4.0-5.2 and at least one addition selected from silicon up to 5.8 wt.% or 0.82 by atomic ratio to the samarium, germanium up to 8.5 wt.% or 0.57 by atomic ratio to the samarium and aluminum up to 4.75 wt.% or 0.82 by atomic ratio to the samarium, and having increased intrinsic coercive force and decreased irreversible magnetic induction loss with temperature. In the case wherein the total amount of the aforesaid addition or additions is limited, by atomic ratio to the samarium, to up to 0.25, the samarium cobalt magnetic materials may provide sintered permanent magnets having a reduced irreversible magnetic induction loss with temperature, without decreased residual magnetic flux density. When the total amount of the aforesaid addition is restricted, by atomic ratio to samarium, to up to 0.21, the resulting material may provide compacted permanent magnets having reduced irreversible magnetic induction loss with temperature, without any reduction of residual magnetic flux density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.