Cermet powders
Abstract
Abstract A metallurgical method for making homogeneous powders characterized by ultra-fine particle size typically in the range .01 - .1 microns. First, dry blend starting materials containing a mixture of carbon and the metal oxides of two or more different metals, one metal having a predetermined carbide forming strength and the other metal having less than the predetermined carbide forming strength. The starting materials are then cold mixed with a liquid pre-polymerized furfuryl alcohol resin binder containing a catalyst until a homogeneous mass is obtained. The mass is cold extruded into the shape of an electrode, cured to the desired hardness and then rapidly baked until electrically conductive. The electrode is then connected as the anode in a high intensity electric arc circuit enclosed in a non-oxidizing atmosphere. The arc process consumes the anode and a homogeneous powder is produced out of the characteristic tail flame. The powder comprises a mixture of finely divided particles of metal carbide and metal useful in manufacturing cemented carbide bodies.
Inventors
- 👤 R Borg
- 👤 J Wolfe
- 👤 D Lai
- 👤 N Riley
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |