Rare earth-containing permanent magnets
US3982971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1975 |
| Grant date | Sep 28, 1976 |
| Priority date | — |
| Expiry date | Feb 20, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0557
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Permanent magnets are disclosed having a very high coercive force and a very great maximum energy product, and consisting essentially of a rare earth-cobalt based alloy. The alloy is expressed by the formula Sm.sub.1.sub.-u Ce.sub.u (Co.sub.1.sub.-v.sub.-w.sub.-x Cu.sub.v Fe.sub.w Mn.sub.x).sub.z where 0.ltoreq.u.ltoreq.0.20, 0.08.ltoreq.v.ltoreq.0.20, 0.ltoreq.w.ltoreq.0.08, 0.01.ltoreq.x.ltoreq.0.15 and 6.0.ltoreq.z.ltoreq.7.8, preferably 7.2.ltoreq.z.ltoreq.7.8. By using these alloys, the magnetic properties of the resultant permanent magnets are superiorly affected, and the magnet-preparing process is rendered much simplified. This is also because the conventional heat aging step may be eliminated, particularly when the z value is within the preferred range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.