Nickel or cobalt wear-resistant compositions and coatings
Abstract
Abstract METALLIC COMPOSITIONS AND SUBSTRATES COATED THEREWITH HAVING IMPROVED WEAR RESISTANCE AND OTHER PROPERTIES ARE PROVIDED. IN A PREFERRED EMBODIMENT, THE COATING COMPRISES AN INTIMATE DISPERSION OF HARD NICKEL-BORIDE (NI3B) OR NICKEL PHOSPHIDE (NI3P) IN A SOFT MATRIX OF NICKEL AND THALLIUM. THE COATING IS PREPARED BY CHEMICAL REDUCTION OF NICKEL AND THALLIUM SALTS USING BOROHYDRIDES SUCH AS SODIUM BOROHYDRIDE AND DIMETHYLAMINE BORANE (DMAB) OR SODIUM HYPOPHOSPHITE. THE PROPORTIONS OF THE METALS IN THE PREFERRED COATING ARE ABOUT 99.4 TO 82 PERCENT BY WEIGHT NICKEL, ABOUT 0.1 TO 12 PERCENT BY WEIGHT BORON OR PHOSPHORUS AND ABOUT 0.5 TO 6 PERCENT BY WEIGHT THALLIUM. COBALT CAN BE USED AS WELL AS THE PREFERRED NICKEL. IN THE METALLIC COMPOSITIONS, ABRASIONRESISTANT PARTICLES SUCH AS METAL CARBIDES CAN BE PRESENT IN THE SOFT MATRIX OF NICKEL AND THALLIUM. THE COATING CAN BE HEAT-TREATED AT 300 TO 500*C. TO ACHIEVE OPTIMUM METALLURGICAL STRUCTURE. SHAPED STRUCTURES SUBJECT TO WEAR, SUCH AS PISTON RINGS AND BEARINGS, AND STRUCTURES SUBJECTED TO CUTTING ACTION, SUCH AS TWIST DRILLS, ARE PARTICULARLY BENEFITED BY THE COATINGS.
Inventors
- 👤 Harold Edward Bellis
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |