Air sintering of aluminum powder compacts
Abstract
Abstract ALUMINUM METAL POWDER COMPACTS ARE SO MADE THAT THEY CAN BE SINTERED IN AMBIENT ATMOSPHERIC AIR WITH RESULTING OUTSTANDING PHYSICAL PROPERTIES. THE CONTROLS WHICH MAKE THIS POSSIBLE INCLUDE THE USE OF A CONTROLLED AMOUNT OF MAGNESIUM OR ZINC, OR BOTH, IN THE POWDER MIXTURE, COMPACTION OF 92 TO 97% OF THEORETICAL DENSITY, THE ABSENCE OF ANY COMPONENT IN THE POWDER MIXTURE WHICH WOULD PRECLUDE DIRECT METAL-TO-METAL INTERFACE CONTACT BETWEEN THE METAL PARTICLES OR VOLATIZLIZED DURING HEATING UP TO SINTERING TEMPERATURE, THE USE OF A NORMALLY LIQUID OIL AS A DIE WALL LUBRICANT, CONTROL OF THE HEATING-UP RATE TO SINTERING TEMPERATURE, AND USE OF A RELATIVELY SHORT SINTERING PERIOD.
Inventors
- 👤 Samuel Storchheim
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |