Anisotropic neodymium-iron-boron permanent magnets formed at reduced hot working temperatures
US5211766A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1992 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Jan 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0576
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Additions of carbon or tantalum ranging between about 0.1 to about 0.15 weight percent are added to an iron-rare earth metal permanent magnet alloy. The permanent magnet alloy contains the magnetic phase consisting of Fe.sub.14 Nd.sub.2 B (or the equivalent) tetragonal crystals, which is primarily based on neodymium and/or praseodymium, iron and boron. The isotropic melt-spun ribbons of the preferred alloy are characterized by generally improved magnetic properties. The anisotropic magnetic bodies formed from these ribbons are hot worked at temperatures substantially lower than the conventional alloy which does not contain the carbon or tantalum additions, with an improvement in magnetic properties observed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.