Permanent magnet materials
US4975130A · kind A · utility
11Cited by
23References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1987 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | May 19, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49076
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Permanent magnet materials of the Fe--B--R type are produced by: PA0 preparing a metallic powder having a mean particle size of 0.3-80 microns and a composition of 8-30 at % R, 2-28 at % B, and the balance Fe, PA0 compacting, and PA0 sintering, at a temperature of 900-1200 degrees C. Co up to 50 at % may be present. Additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) may be present. The process is applicable for anisotropic and isotropic magnet materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.