Method for producing rare earth bond magnet, composition for rare earth bond magnet, and rare earth bond magnet
US6001272A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1998 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Mar 10, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S977/777
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of the invention for manufacturing a rare earth bonded magnet has the steps of mixing a rare earth magnet powder, binder resin and an additive at a predetermined ratio, kneading the mixture at a temperature not lower than the thermal deformation temperature of the binder resin, granulating or graining the kneaded blend to granules of an average size ranging from 0.01 mm to 2 mm or so, conducting a compacting molding of the granulated material at a first temperature at which the binder resin is softened or molten, and cooling the molded body while keeping the molded body under pressure at least over a period in which the molded body cools down to a second temperature which s below the first temperature, whereby a rare earth bonded magnet is obtained having a low porosity, high dimensional precision and superior magnetic characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.