Method for manufacturing permanent magnets
US5100485A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1990 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Feb 21, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0576
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing permanent magnets from a plurality of thin flakes of a rare earth-Fe-B alloy metal, comprising the steps of PA0 subjecting the thin flakes to a discharge electric field, the thin flakes being comprised of an R-Fe-B alloy metal; and R-Fe-B-M alloy metal; an R-Fe(Co)-B alloy metal comprising 11 to 18 atom % R, 4 to 11 atom % B, 30 atom % Co, the balance being Fe; and/or an R-Fe(Co)-M-B alloy metal, PA0 generating Joule heat on the contacting interfaces of the thin flakes by applying pressure to the gathered body of thin flakes and by supplying a current thereto, and PA0 bonding the gathered body integrally by making the thin flakes deform plastically in a warm state. R is one or more rare earth elements and M is one or more members selected from the group consisting of Si, Al, Nb, Zr, Hf, Mo, Ga, P and C. The thin flakes are in a nonequilibrium state such that the R.sub.2 Fe.sub.14 B phases and amorphous phases are coexistent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.