Permanent magnet
US4975129A · kind A · utility
8Cited by
8References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1988 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Sep 27, 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 FeBR system in which R is sum of R.sub.1 and R.sub.2 wherein: PA0 R.sub.1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, and PA0 R.sub.2 comprises 80 at % or more of Nd and Pr in R.sub.2 and the balance of at least one of other rare earth elements exclusive of R.sub.1, PA0 said system comprising by atomic percent, 0.05 to 5% of R.sub.1, 12.5 to 20% of R, 4 to 20% of B, and the balance being Fe with impurities. 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.