Rare earth permanent magnet and a method for manufacture thereof
US5057165A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1990 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | Jul 27, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/055
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rare earth permanent magnet of a composition, Ce(CO.sub.1-x-y-a Fe.sub.x Cu.sub.y M.sub.a).sub.z, where a, x, y, and z are: 0.005<1<0.10; 0.20<x<0.40; 0.10<y<0.30; 4.8<z<6.0; and M is zirconium, titanium, nickel, and/or manganese. A method for manufacturing the magnet is disclosed comprising the steps of: applying a first solid solution heat treatment to an alloy ingot having the above composition at temperatures from 900.degree. to 1100.degree. C. for 10 minutes to 100 hours; pulverizing the alloy ingot; obtaining a magnet body from this pulverized alloy by the powder metallurgy method; sintering the magnet body; applying a second solid solution heat treatment to the sintered magnet body at 900.degree.-100.degree. C. for 10 minutes to 100 hours; and applying aging heat treatment to the sintered magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.