US4290826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cobalt-rare earth alloy powders
Assignee: Viridian Inc Canada
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Filing: 1980-09-30
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Granted: 1981-09-22
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Expires: 2000-09-30
Abstract
Abstract A process for producing cobalt-rare earth alloy powders suitable for forming into permanent magnets includes mixing cobalt powder particles having refractory oxide dispersoid powder particles fixed in the surfaces of the cobalt particles with particles of a rare earth element in a proportion corresponding to the composition of the alloy to be formed. The mixture is heated to cause the cobalt-dispersoid particles and the rare earth particles to form the desired alloy by diffusion with substantially no sintering.
Inventors
- 👤 Maurice A. Clegg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:02
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
87 words
A process for producing cobalt-rare earth alloy powders suitable for forming into permanent magnets, including providing cobalt powder particles having refractory oxide dispersoid powder particles fixed in the surfaces of the cobalt particles, providing particles of a rare earth element, mixing the cobalt-dispersoid particles with the rare earth particles in a proportion corresponding to the composition of the alloy to be formed, and heating the mixture to cause the cobalt-dispersoid particles and the rare earth particles to form the desired alloy by diffusion with substantially no sintering.
Claim 2
Dependent Claim
87 words
A process for producing cobalt-rare earth alloy powders suitable for forming into permanent magnets, including providing cobalt powder particles having refractory oxide dispersoid powder particles fixed in the surfaces of the cobalt particles, providing particles of a rare earth element, mixing the cobalt-dispersoid particles with the rare earth particles in a proportion corresponding to the composition of the alloy to be formed, and heating the mixture to cause the cobalt-dispersoid particles and the rare earth particles to form the desired alloy by diffusion with substantially no sintering.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the cobalt particles are of a size in the range of from about 0.2 to about 5 micrometers.
Claim 4
Dependent Claim
28 words
A process according to claim 2 wherein the refractory oxide dispersiod powder particles are of a size in the range of from about 1 to about 20 nanometers.
Claim 5
Dependent Claim
35 words
A process according to claim 1 wherein the refractory oxide dispersoid powder particles are present in the cobalt-dispersoid particles in the proportion of from about 0.5 to about 2% by weight of the cobalt particles.
Claim 6
Dependent Claim
27 words
A process according to claim 1 wherein the rare earth element particles are of a size in the range of from about 5 to about 44 micrometers.
Claim 7
Dependent Claim
13 words
A process according to claim 1 wherein the refractory oxide dispersoid is thoria.
Claim 8
Dependent Claim
13 words
A process according to claim 1 wherein the refractory oxide dispersoid is yttria.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein the rare earth element is samarium.
Claim 10
Dependent Claim
14 words
A process according to claim 1 wherein the rare earth element is misch metal.
Claim 11
Dependent Claim
26 words
A process according to claim 1 wherein the mixture is heated at a temperature in the range of from about 980° C. to about 1100° C.
Claim 12
Dependent Claim
14 words
A process according to claim 1 wherein the alloy formed is Co 5 Sm.
Claim 13
Dependent Claim
158 words
A process for producing cobalt-rare earth alloy powders suitable for forming into permanent magnets, including providing cobalt powder particles with a particle size in the range of from about 0.2 to about 5 micrometers and with refractory oxide dispersoid powder particles fixed in the surfaces of the cobalt particles, said refractory oxide dispersoid powder particles having a size in the range of from about 1 to about 20 nanometers, the proportion of dispersoid particles to cobalt particles being from about 0.5 to about 2% by weight of the cobalt particles, providing particles of a rare earth element having a size in the range of from about 5 to about 44 micrometers, mixing the cobalt-dispersoid particles with the rare earth particles in a proportion corresponding to the composition of the alloy to be formed, and heating the mixture to cause the cobalt-dispersoid particles and the rare earth particles to form the desired alloy by diffusion with substantially no sintering.
Claim 14
Dependent Claim
158 words
A process for producing cobalt-rare earth alloy powders suitable for forming into permanent magnets, including providing cobalt powder particles with a particle size in the range of from about 0.2 to about 5 micrometers and with refractory oxide dispersoid powder particles fixed in the surfaces of the cobalt particles, said refractory oxide dispersoid powder particles having a size in the range of from about 1 to about 20 nanometers, the proportion of dispersoid particles to cobalt particles being from about 0.5 to about 2% by weight of the cobalt particles, providing particles of a rare earth element having a size in the range of from about 5 to about 44 micrometers, mixing the cobalt-dispersoid particles with the rare earth particles in a proportion corresponding to the composition of the alloy to be formed, and heating the mixture to cause the cobalt-dispersoid particles and the rare earth particles to form the desired alloy by diffusion with substantially no sintering.
Claim 15
Dependent Claim
13 words
A process according to claim 12 wherein the refractory oxide dispersoid is thoria.
Claim 16
Dependent Claim
13 words
A process according to claim 12 wherein the rare earth element is samarium.
Claim 17
Dependent Claim
14 words
A process according to claim 14 wherein the alloy formed is Co 5 Sm.
Claim 18
Dependent Claim
26 words
A process according to claim 12 wherein the mixture is heated at a temperature in the range of from about 980° C. to about 1100° 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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |