Extrusion-molded magnetic body comprising samarium-iron-nitrogen system magnetic particles
US6190573A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1999 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Feb 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/059
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention is directed to an extrusion-molded magnet comprising a samarium-iron-nitrogen material, which is novel and capable of exhibiting excellent magnetic properties, i.e., samarium-iron-nitrogen system magnetic particles excellent in magnetic properties. A permanent magnet material comprising a samarium-iron-nitrogen system magnetized anisotropy particles and having increased inter-iron atom distance and elevated magnetic saturation. The magnet material is prepared by a method of causing nitrogen intrusion into the iron crystal lattice of a samarium-iron alloy by holding the alloy in a nitrogen gas at about 500 degrees C. The prepared permanent magnet material is added to a thermoplastic polyolefin system synthetic resin, and the admixture is thermally fused and kneaded. The paste thus obtained is charged into an extrusion molder and extruded through a magnetic field device, which is at an end of the extrusion molder and has an internal die, thus obtaining a molded magnet. The resulting molded magnet which has a particle array in a fixed orientation and is flexible. The molded magnet is magnetized with a magnetizing device in conformity to the particle array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.