Permanent magnets
US4859255A · kind A · utility
15Cited by
6References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0577
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magnetically anisotropic sintered permanent magnet of the FeCoBR system (R is sum of R.sub.1 and R.sub.2) wherein: PA1 R.sub.1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, and PA1 R.sub.2 comprises 80 at % or more of Nd and Pr in R.sub.2, and the balance of other rare earth elements exclusive of R.sub.1, PA1 said system consisting essentially of, by atomic percent, 0.05 to 5% of R.sub.1, 12.5 to 20% of R, 4 to 20% of B up to 35% of Co, and the balance being Fe. Additional elements M(Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V, W) may be present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.