Glass-ceramics containing pollucite
Abstract
Abstract THE INSTANT INVENTION RELATES TO THE PRODUCTION OF OPAQUE GLASS-CERAMIC ARTICLES HAVING COMPOSITIONS WITHIN THE CS2O-AL2O3-SIO2 FIELD WHEREIN THE CRYSTAL PHASE PRESENT CONSISTS ESSENTIALLY OF POLLUCITE SOLID SOLUTION WITH, FREQUENTLY, A MINOR AMOUNT OF MULLITE. THE ARTICLES EXHIBIT EXTREME REFRACTORIES, E.G., CERTAIN BODIES DEMONSTRATE EXCELLENT DIMENSIONAL STABILITY TO TEMPERATURES UP TO 1550* C. THIS HIGH REFRACTORINESS, COUPLED WITH CHEMICAL INERTNESS TO MOLTEN METAL, HAS LED TO THE USE OF THESE MATERIALS AS PERFORM CORES IN THE MAKING OF HOLLOW METAL CASTINGS, SUCH AS JET ENGINE BLADES AND VANES WHICH REQUIRE THE USE OF VERY HIGH TEMPERATURE ALLOYS SUCH AS THE SO-CALLED SUPER ALLOYS OF NICKEL AND COBALT BASE.
Inventors
- 👤 G Beall
- 👤 H Rittler
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 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 |