Alumina-transition metal oxide ceramic products of enhanced ductility
Abstract
Abstract High-density, finely grained aluminous ceramic compositions are produced by maintaining mixtures of finely divided alumina precursors and transition metal oxide precursors under pressure at a temperature high enough to decompose the precursors to ceramic oxides but below the melting point of the resulting ceramic oxide composition. The novel ceramic compositions produced by this process are characterized by enhanced ductility at temperatures below their melting points, and are therefore useful in the production of ceramic objects by deformation processes of hot forming and the like. They can be heated to temperatures nearer their melting points for crystal growth and creep-resistance.
Inventors
- 👤 R Clendenen
Bibliographic Details
Claims Analysis
Total Claims: 2References 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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |