Bond magnet and manufacturing method thereof, and actuator therewith
US6317020A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | May 19, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S977/896
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A bond magnet comprises a molded body in which a mixture of flake of magnet material comprising rare earth element-iron-nitrogen as main component, TbCu.sub.7 type crystal phase as a principal phase and a thickness of less than 200 .mu.m a binder is compression molded. A compression molded body constituting a bond magnet has a density of 6.times.10.sup.3 kg/m.sup.3 or more. In the step of compression molding a mixture of magnet material and binder, pressure is applied a plurality of times, or pressure is applied while rotating a punch and die, or the binder is cured while applying pressure to obtain such a bond magnet with good reproducibility. Such a bond magnet has excellent magnetic properties and corrosion resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.