Method of making valve seat rings from a mixture of c,pb and a pre-alloy of fe-co-ni-mo by powder metallurgy
Abstract
Abstract A POWDER METALLURGICAL METHOD OF MAKING VALVE SEAT RINGS HAVING A HIGH HEAT RESISTANCE, WHILE EMPLOYING A METAL POWDER WHICH IN ADDITION TO IRON CONTAINS FROM 0.5 TO 1% OF CARBON, FROM 0.7 TO 1.5% OF LEAD, FROM 1 TO 2% OF NICKEL, FROM 1.0 TO 2.0% OF MULYBDENUM, AND COBALT. AS STARTING MIXTURE IS EMPOLYED A PULVERIZED PRE-ALLOY WHICH CONTAINS FROM 1 TO 2% OF NICKEL, 1.0 TO 2% OF MOLYBDENUM, FROM 6.0 TO 7.0% OF COBALT, AND THE REMAINDER IRON. TO THE TUUS PRE-ALLOYED STEEL POWDER THERE IS ADDED CARBON IN QUANTITIES OF FROM 0.5 TO 1.0%, AND LEAD AT A QUANTITY OF FROM 0.7 TO 1.5%.SUBEEQUENTLY, THE MIXTURE IS BRIQUETTED, SINTERED COLD OR HOT POST-COMPRESSED, AND IF DESIRED, IS ANNEALED.
Inventors
- 👤 M Koehler
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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |