Method of coating refractory metals for protection at high temperatures and resulting articles
Abstract
Abstract THIS SPECIFICATION DESCRIBES AN ARTICLE FOR USE AT HIGH TEMPERATURE, FOR EXAMPLE IN THE GLASS INDUSTRY, AND COMPRISES A REFRACTORY CORE MADE FROM NIOBIUM, TANTALUM, CHROMIUM, ZIRCONIUM, VANADIUM, HAFNIUM, RHENIUM OR ALLOYS THEREOF, A BARRIER LAYER OF MAGNESIA AND A SHEATH OF A PLATINUM GROUP METAL OR AN ALLOY BASED ON AT LEAST ONE METAL OF THE PLATINUM GROUP. THE OXIDES OF THE COORE METAL OR ALLOY ARE CHOSEN TO BE LESS VOLATILE THAN THE OXIDES OF MOLYBDENUM AT OPERATING TEMPERATURES WITHIN THE RANGE 1100* TO 1500*C. A CORE MAY ALSO BE MADE FROM TUNGSTEN OF MOLYBDENUM AND IN SUCH A CASE THE BARRIER LAYER MAY CONTAIN A SMALL QUANTITY OF VITREOUS MATERIAL, FOR EXAMPLE BOROSILICATE GLASS.
Inventors
- 👤 A S Darling
- 👤 G L Selman
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |