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US4082582A
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As - cast permanent magnet sm-co-cu material, with iron, produced by annealing and rapid quenching
Assignee: UGIMAG RECOMA SA A CORP OF SWITZERLAND
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Filing: 1975-12-02
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Granted: 1978-04-04
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Expires: 1995-12-02
Abstract
Abstract A permanent-magnet material containing samarium, cobalt, copper and iron, has the composition Sm(Co 1-x-y- Fe x Cu y ) z , wherein 0 < x < 0.2, 0.1 < y < 0.3 and 6.5 < z < 7.5.
Inventors
- 👤 Anton Menth
- 👤 Anthony J. Perry
- 👤 Ulrich Spinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:46
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A method of producing permanent-magnet material having the composition Sm(Co 1-x-y Fe x Cu y ) z , wherein 0 < x < 0.2, 0.1 < y < 0.3 and 6.5 < z < 7.5, which comprises: melting together said elements in amounts according to said composition, solidifying the melt by slowly cooling said melt, annealing the alloy of the melted together elements at temperatures between 1150° and 1250° C, subsequently rapidly quenching said alloy, and further annealing said alloy at temperatures between 750 and 850° C.
Claim 2
Independent Claim
87 words
A method of producing permanent-magnet material having the composition Sm(Co 1-x-y Fe x Cu y ) z , wherein 0 < x < 0.2, 0.1 < y < 0.3 and 6.5 < z < 7.5, which comprises: melting together said elements in amounts according to said composition, solidifying the melt by slowly cooling said melt, annealing the alloy of the melted together elements at temperatures between 1150° and 1250° C, subsequently rapidly quenching said alloy, and further annealing said alloy at temperatures between 750 and 850° C.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein the alloy is annealed at about 1200° C for about 1 hour and then quenched.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the quenching is performed in liquid argon or nitrogen.
Claim 5
Dependent Claim
19 words
The method of claim 1, wherein said second annealing is effected at about 820° C for about 1 hour.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |