Permanent magnet material containing a rare-earth element, iron, nitrogen and carbon
US5720828A · kind A · utility
18Cited by
11References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1995 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Feb 15, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/059
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Magnetic materials containing a rare earth metal, and iron or a similar metal, as well as nitrogen and carbon, are produced by gas absorbing nitrogen and carbon sequentially into a parent intermetallic compound; the resulting magnetic materials have high T.sub.c, .mu..sub.o M.sub.s and .mu..sub.o H.sub.A, are essentially free of .alpha.-Fe, and have a coercivity at 300.degree. K. of at least 1.5 T. Anisotropic magnetic materials are produced by pretreating the intermetallic compound, which contains carbon, by powder sintering or oriented hot shaping, followed by nitriding and/or carbiding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.