Heat-aged sintered cobalt-rare earth intermetallic product and process
Abstract
Abstract A PROCESS FOR PREPARING HEAT-AGED NOVEL SINTERED COBALTRARE EARTH INTERMETALLIC PRODUCTS WHICH CAN BE MAGNETIZED TO FORM PERMANENT MAGNETS HAVING STABLE IMPROVED MAGNETIC PROPERTIES. A SINTERED COBALT-RARE EARTH METAL PRODUCT IS PROVIDED WHICH AT ITS SINTERING TEMPERATURE IS A COMPOSITION RANGING FROM A SINGLE SOLID CO5R INTERMETALLIC PHASE TO THAT COMPOSED OF CO5R SOLID INTERMETALLIC PHASE AND A SECOND PHASE OF SOLID COR WHICH IS RICHER IN RARE EARTH METAL CONTENT THAN THE CO5R PHASE AND WHICH IS PRESENT IN AN AMOUNT OF UP TO ABOUT 30 PERCENT BY WEIGHT OF THE PRODUCT. THE SINTERED PRODUCT IS HEATED AT A TEMPERATURE WITHIN 400*C. BELOW ITS SINTERING TEMPERATURE TO PRECIPITATE OUT OF THE CO5R PHASE OF A COR PHASE RICHER IN RARE EARTH METAL CONTENT THAN THE CO5R PHASE IN AN AMOUNT SUFFICIENT TO IMPROVE COERCIVE FORCE, EITHER INTRINSIC AND/OR NORMAL, OF THE PRODUCT BY AT LEAST 10 PERCENT.
Inventors
- 👤 Mark G Benz
- 👤 Donald L Martin
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |