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US3901742A
Expired / Lapsed
US
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Removal of lubricants and binders from sinterable powder components
Assignee: General Electric Co
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Filing: 1974-04-11
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Granted: 1975-08-26
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Expires: 1994-04-11
Abstract
Abstract Powdered metal parts, particulary cobalt-rare earth magnets, having a smooth surface and strong structure are prepared by mixing the powder with an organic lubricant, press-forming the mixture to a desired configuration, removing the lubricant by solvent extraction, evaporating off residual solvent, and sintering.
Inventors
- 👤 George Facaros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:19
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0555; H01F1/0557; B; B22; B22F; B22F3/00; B22F3/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
38 words
THE METHOD OF PREPARING SINTERED POWDERED METAL PARTS WHICH COMPRISES: MIXING POWDERED METAL WITH AN ORGANIC LUBRICANT: FORMING THE MIXTURE TO A DESIRED SHAPE: REMOVING THE LUBRICANT FROM SAID FORMED SHAPE BY SOLVENT EXTRACTION: AND SINTERED SHAPE MATERIAL.
Claim 2
Independent Claim
38 words
THE METHOD OF PREPARING SINTERED POWDERED METAL PARTS WHICH COMPRISES: MIXING POWDERED METAL WITH AN ORGANIC LUBRICANT: FORMING THE MIXTURE TO A DESIRED SHAPE: REMOVING THE LUBRICANT FROM SAID FORMED SHAPE BY SOLVENT EXTRACTION: AND SINTERED SHAPE MATERIAL.
Claim 3
Dependent Claim
17 words
The method of claim 1 in which the extraction step is followed by a solvent evaporation treatment.
Claim 4
Dependent Claim
11 words
The method of claim 1 in which the solvent is trichloroethylene.
Claim 5
Dependent Claim
11 words
The method of claim 1 in which the solvent is tetrachlorethylene.
Claim 6
Dependent Claim
11 words
The method of claim 1 in which the solvent is trichloroethane.
Claim 7
Independent Claim
53 words
The method of producing a cobalt-rare earth magnet which comprises: mixing particles of cobalt-rare earth intermetallic compound with an organic lubricant; press-forming the mixture into a magnet configuration in aligning magnetic field; removing the lubricant from said configuration by solvent extraction; and sintering said configuration to fix the particles thereof firmly in position.
Claim 8
Independent Claim
53 words
The method of producing a cobalt-rare earth magnet which comprises: mixing particles of cobalt-rare earth intermetallic compound with an organic lubricant; press-forming the mixture into a magnet configuration in aligning magnetic field; removing the lubricant from said configuration by solvent extraction; and sintering said configuration to fix the particles thereof firmly in position.
Claim 9
Dependent Claim
37 words
The method of claim 6 in which the sintering step is followed by cooling at the rate of about 5* C. per minute to about 915* C., after which the magnet configuration is quench-cooled to room temperature.
Claim 10
Dependent Claim
17 words
The method of claim 7 in which the extraction step is followed by a solvent evaporation treatment.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |