US4131495A
Expired / Lapsed
US
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Permanent-magnet alloy
Assignee: UGIMAG RECOMA SA A CORP OF SWITZERLAND
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Filing: 1976-11-30
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Granted: 1978-12-26
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Expires: 1996-11-30
Abstract
Abstract A permanent-magnet alloy having the formula RE(Co.sub.1-u-v-w-x-y Fe.sub.u Mn.sub.v Cr.sub.w V.sub.x X.sub.y).sub.z wherein RE is samarium, cerium, cerium misch metal (MM), psaseodymium, neodymium, lanthanum or mixtures thereof, X is Al, Cu or mixture thereof, and 0 ≦ u < 0.15 0 ≦ v < 0.15 0 ≦ w < 0.10 0 ≦ x < 0.10 0.05 < y < 0.20 6.5 < z < 8.5
Inventors
- 👤 Anton Menth
- 👤 Hartmut Nagel
- 👤 Ulrich Spinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:41
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; A; A47; A47C; A47C7/00; A47C7/02; A47C7/021; C22C1/00; C22C1/02; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0555; H01F1/0557
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
A permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which has been prepared by the process which comprises melting and casting said alloy from starting materials followed by homogenization heat-treating the alloy of the molten and cast starting materials at a temperature just above the solidus temperature or in the temperature range in which the non-RE and non-Co components of the alloy have their maximum solubility in the RE 2 Co 17 mixed crystals; crushing and grinding the alloy to a particle size of from 2 μm to 10 μm; magnetically aligning the resultant powder; isostatically compressing the resultant powder; sintering the resulting briquette just below the solidus temperature; and finally annealing the alloy at a temperature between 700° C. and 900° C.
Claim 2
Dependent Claim
164 words
A permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which has been prepared by the process which comprises melting and casting said alloy from starting materials followed by homogenization heat-treating the alloy of the molten and cast starting materials at a temperature just above the solidus temperature or in the temperature range in which the non-RE and non-Co components of the alloy have their maximum solubility in the RE 2 Co 17 mixed crystals; crushing and grinding the alloy to a particle size of from 2 μm to 10 μm; magnetically aligning the resultant powder; isostatically compressing the resultant powder; sintering the resulting briquette just below the solidus temperature; and finally annealing the alloy at a temperature between 700° C. and 900° C.
Claim 3
Dependent Claim
115 words
A permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which has been prepared by the process which comprises melting and casting the molten starting materials of said alloy in a physical shape as similar as possible to that desired for the end product; solidifying the cast alloy by directed crystallization; homogenizing it at a temperature just below the solidus temperature; and then annealing heat-treating it in the region from 700° C. to 900° C.
Claim 4
Dependent Claim
115 words
A permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which has been prepared by the process which comprises melting and casting the molten starting materials of said alloy in a physical shape as similar as possible to that desired for the end product; solidifying the cast alloy by directed crystallization; homogenizing it at a temperature just below the solidus temperature; and then annealing heat-treating it in the region from 700° C. to 900° C.
Claim 5
Dependent Claim
161 words
A process for preparing a permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which comprises melting and casting said alloy from starting materials followed by homogenization heat-treating the alloy of the molten and cast starting materials at a temperature just above the solidus temperature or in the temperature range in which the non-RE and non-Co components of the alloy have their maximum solubility in the RE 2 Co 17 mixed crystals; crushing and grinding the alloy to a particle size of from 2 μm to 10 μm; magnetically aligning the resultant powder; isostatically compressing the resultant powder; sintering the resultant briquette just below the solidus temperature; and finally annealing the alloy at a temperature between 700° C. and 900° C.
Claim 6
Dependent Claim
161 words
A process for preparing a permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which comprises melting and casting said alloy from starting materials followed by homogenization heat-treating the alloy of the molten and cast starting materials at a temperature just above the solidus temperature or in the temperature range in which the non-RE and non-Co components of the alloy have their maximum solubility in the RE 2 Co 17 mixed crystals; crushing and grinding the alloy to a particle size of from 2 μm to 10 μm; magnetically aligning the resultant powder; isostatically compressing the resultant powder; sintering the resultant briquette just below the solidus temperature; and finally annealing the alloy at a temperature between 700° C. and 900° C.
Claim 7
Dependent Claim
110 words
A process for preparing a permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which comprises melting and casting said alloy from starting materials in a physical shape as similar as possible to that desired for the end product; solidifying the cast alloy by directed crystallization; homogenizing it at a temperature just below the solidus temperature; and then annealing heat-treating it in the region from 700° C. to 900° C.
Claim 8
Dependent Claim
110 words
A process for preparing a permanent magnet alloy selected from the group consisting of RE (Co.sub.1-u-w-y Fe.sub.u Cr.sub.w Cu.sub.y).sub.z wherein RE is samarium, cerium, cerium mischmetal (MM), praseodymium, neodymium, lanthanum or mixtures thereof and 0.05 < u < 0.13 0.02 < w < 0.05 0.10 < y < 0.18 7.0 < z < 7.5 which comprises melting and casting said alloy from starting materials in a physical shape as similar as possible to that desired for the end product; solidifying the cast alloy by directed crystallization; homogenizing it at a temperature just below the solidus temperature; and then annealing heat-treating it in the region from 700° C. to 900° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |