Transparent yttria ceramics containing magnesia or magnesium aluminate
US4174973A · kind A · utility
13Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1979 |
| Grant date | Nov 20, 1979 |
| Priority date | — |
| Expiry date | Jan 29, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/505
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An article of manufacture comprising a substantially transparent high density polycrystalline yttria-based body consisting essentially of yttria and from 0.1 to 5 wt. % MgO or from 0.1 to 5 wt. % MgAl.sub.2 O.sub.4. Transparent yttria-based bodies according to this invention are particularly useful as envelopes for high pressure sodium vapor lamps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.