Permanent magnet and method of producing same
US4836868A · kind A · utility
35Cited by
2References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Apr 14, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/10977
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an R-Fe-B permanent magnet produced by a process including a rapid cooling, a composition of EQU {R.sub.a (Ce.sub.b La.sub.1-b).sub.1-a }x(Fe.sub.1-z Co.sub.z).sub.100-x-y-w B.sub.y M.sub.w (R is at least one rare earth element except for La and Ce but including Y, 5.5.ltoreq.x<12, 2.ltoreq.y<15, 0.ltoreq.z.ltoreq.0.7, 0<w.ltoreq.10, 0.80.ltoreq.a.ltoreq.1.00, 0.ltoreq.b.ltoreq.1, M is Zr, Nb, Mo, Hf, Ta, W, Ti, and/or V) is proposed. The presence of the M element increases a ((BH)max) to a value higher than that of a composition wherein x is higher than 12 and makes the magnet more easily magnetizable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.