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US4144105A
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Method of making cerium misch-metal/cobalt magnets
Assignee: UGIMAG RECOMA SA A CORP OF SWITZERLAND
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Filing: 1976-09-09
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Granted: 1979-03-13
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Expires: 1996-09-09
Abstract
Abstract A permanent magnetic material, predominantly containing cerium misch-metal (CeMM) and cobalt, characterized by the composition:
Inventors
- 👤 Sevi Gaiffi
- 👤 Anton Menth
- 👤 Harmut Nagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:03
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; C; C22; C22C; C22C19/00; C22C19/07; H01F1/0555; H01F1/0557
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
42 words
A method of preparing a permanent magnet having improved coercive field strength and having the composition: ((CeMM).sub.1-x RE.sub.x).sub.1-y Sm.sub.y Co.sub.5±0.2 wherein 0.05 < x < 0.5, 0 ≦ y ≦ 0.25, the CEMM has the atomic composition: Ce.sub.α La.sub.β Nd.sub.γ Pr.sub.δ, wherein
Claim 2
Independent Claim
42 words
A method of preparing a permanent magnet having improved coercive field strength and having the composition: ((CeMM).sub.1-x RE.sub.x).sub.1-y Sm.sub.y Co.sub.5±0.2 wherein 0.05 < x < 0.5, 0 ≦ y ≦ 0.25, the CEMM has the atomic composition: Ce.sub.α La.sub.β Nd.sub.γ Pr.sub.δ, wherein
Claim 3
Dependent Claim
5 words
45 < α < 0.55
Claim 4
Dependent Claim
5 words
45 < α < 0.55
Claim 5
Dependent Claim
5 words
20 < β < 0.40
Claim 6
Dependent Claim
5 words
20 < β < 0.40
Claim 7
Dependent Claim
5 words
05 < γ < 0.15
Claim 8
Dependent Claim
5 words
05 < γ < 0.15
Claim 9
Dependent Claim
167 words
00 < δ < 0.05 and α + β + γ + δ = 1, wherein RE consists of the alloy having the atomic composition: Nd.sub.A Pr.sub.B (Ce, La, Sm).sub.C wherein A is 0.75, B is 0.22, C is less than 0.03 and A + B + C = 1; which consists essentially of mixing 1-x parts of comminuted CeMMCo 5 , x parts of comminuted RECo 5 , wherein Re and CeMM are as defined previously and 10 to 14 wt.% based on the total mixture of a sintering additive consisting of 50 to 70 wt.% Sm and 50 to 30 wt.% Co; grinding said mixture under a protective gas to a particle size in the range of 2 to 10 microns; aligning the powder particles in a magnetic field at approximately 50 kOe; isostatically compressing the powder to a pressed body; sintering the body at a temperature in the range of 1035° to 1045° C.; and heat-treating said body at a temperature above 300° C.
Claim 10
Dependent Claim
167 words
00 < δ < 0.05 and α + β + γ + δ = 1, wherein RE consists of the alloy having the atomic composition: Nd.sub.A Pr.sub.B (Ce, La, Sm).sub.C wherein A is 0.75, B is 0.22, C is less than 0.03 and A + B + C = 1; which consists essentially of mixing 1-x parts of comminuted CeMMCo 5 , x parts of comminuted RECo 5 , wherein Re and CeMM are as defined previously and 10 to 14 wt.% based on the total mixture of a sintering additive consisting of 50 to 70 wt.% Sm and 50 to 30 wt.% Co; grinding said mixture under a protective gas to a particle size in the range of 2 to 10 microns; aligning the powder particles in a magnetic field at approximately 50 kOe; isostatically compressing the powder to a pressed body; sintering the body at a temperature in the range of 1035° to 1045° C.; and heat-treating said body at a temperature above 300° C.
Claim 11
Dependent Claim
16 words
The method of claim 1, wherein the permanent magnet has the composition: (CeMM.sub.0.75 RE.sub.0.25).sub.0.85 Sm.sub.0.15 Co.sub.5.
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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |