Permanent magnetic material made of iron-rare earth metal alloy
US5800728A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1995 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Jun 6, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/059
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An iron-rare earth metal permanent magnetic composition, comprising predominant phase having a body-centered tetragonal structure, and consisting essentially of an iron-based alloy having a composition represented by the formula: EQU Fe.sub.a R.sub.b M.sub.c N.sub.d B.sub.e C.sub.f Co.sub.g Ni.sub.h wherein R represents at least one element selected from the group consisting of Y, Th and the lanthanide elements; M represents at least one element selected from the group consisting of Ti, Cr, V, Zr, Nb, Al, Mo, Mn, Hf, Ta, W, Mg, Si, Sn, Ge and Ga; the elements are present in atomic percentages indicated by a, b, c, d, e, f, g and h, wherein a+b+c+d+e+f+g+h=100 atomic %; and further, 3.ltoreq.b.ltoreq.30 0.ltoreq.c.ltoreq.30 0.ltoreq.d.ltoreq.50 0.ltoreq.e.ltoreq.50 0.ltoreq.f.ltoreq.50 provided that 0.3.ltoreq.d+e+f.ltoreq.50 0.ltoreq.g.ltoreq.50 and 0.ltoreq.h<30.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.