Method of controlling the remanent induction of a sintered magnet, and the product thus obtained
US5288454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1993 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Jan 6, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F13/003
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for controlling the remanance of a sintered magnet by varying the time when the orienting field is applied during cold compression. The method comprises obtaining powders of an appropriate particle size, compressing the powders in an oriented field, sintering, heat treating, machining and magnetizing to technical saturation. The cold compressing in an orienting field takes place at a precompression rate of more than 15% before the orienting field is applied. The method applies to magnets of all shapes which must have magnetic induction well defined in modulus and in direction, particularly annular magnets for traveling wave tubes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.