Transparent yttria ceramics and method for producing same
US4166831A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1978 |
| Grant date | Sep 4, 1979 |
| Priority date | — |
| Expiry date | Mar 9, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J5/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttria-base body consisting essentially of yttria and from about 0.01 to 5 wt. % alumina. A method for preparing the transparent yttria doped with alumina is also provided comprising admixing alumina or a precursor thereof with yttria or a precursor thereof, drying the admixed powders, calcining the admixed powders and pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for about 1/4 to six hours at a temperature above the eutectic temperature at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.