Method for forming samarium-iron-nitride magnet alloys
US5395459A · kind A · utility
10Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Nov 18, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/059
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a preferred method, a molten alloy of samarium and iron is formed with a proportion of about 1:4 to about 1:9 of samarium to iron. The molten alloy is then quenched in a non-oxidizing environment at a rate sufficient to form a solid crystalline alloy in the form of a thin ribbon. The ribbon is comminuted to form a powder and the powder is nitrided in a gaseous nitrogen atmosphere. Nitriding causes nitrogen to penetrate and occupy interstitial sites in the Sm-Fe alloy, producing a magnetically hard powder with a high coercivity typically 10 kOe, usually greater than 15 kOe and as high as about 20 to about 23 kOe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.