Process for producing a rare earth element-iron anisotropic magnet
US5178691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1991 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | May 28, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/0273
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A process for producing a rare earth element-iron-boron anisotropic magnet that may generate a strong static magnetic field in vacant spaces of a magnetic circuit mounted in a motor is disclosed. The process comprises the steps of placing a billet produced of rapid solidification powder of a rare earth element-iron-boron alloy into a mold cavity, applying a primary pressure to said billet, while allowing a primary current to pass through said billet, applying to said billet a secondary pressure which is increased up to at least five times as much as the primary pressure, and applying a secondary current greater than the primary current through said billet, wherein the billet is finally subjected to plastic deformation at the temperature between the crystalline temperature and 750.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.