Process of producing aligned permanent magnets
US4897283A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1987 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Jul 6, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C4/134
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A highly aligned rare-earth transition metal alloy magnet material such as samarium-cobalt (SmCo.sub.5). The high degree of alignment is evidenced by an isolated X-ray diffraction pattern peak for Cu.sub.k.alpha. radiation at a interplane "d" spacing of 2.0 A.degree. and is produced by very high temperature deposition of the material on a hot surface. The surface temperature is maintained well above 800 degrees centigrade and most preferably is initially set at approximately 1020 degrees centigrade or higher at which temperature the isolated diffraction pattern peak dominates. A higher temperature typically occurs during deposition. Deposition of the material on the surface typically takes place by application of the material as a fine, homogeneously sized powder to the plasma flame of a plasma torch. The surface may be preheated by the application of the plasma flame to the surface without the application of the powdered material. A feedback controlled auxiliary heat source may also be used to facilitate maintaining the temperature of the surface at the very high temperature level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.