Glass that withstands high-temperatures for lamp bulbs, and its use
AssigneeSchott AG
InventorsJoerg Fechner, Franz Ott
Life of this patent
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Abstract
The alumino-silicate glass for lamp bulbs with molybdenum components contains alkaline earth metals and has the following composition (in % by weight based on oxide): SiO2>58 to 62, Al2O3 15 to 17.5, MgO 0.1 to <1, CaO 5.5 to 14, SrO 0 to 8, BaO 6 to 17, ZrO2 0 to 1, CeO2 0 to 0.3, TiO2 0 to 5, MoO30 to 2, Bi2O3 0 to 4, with a sum total amount of alkaline earth oxides from 11.6 to 29. Lamp bulbs made with this glass can withstand a bulb temperature of greater than 650° C.
Claims9
An alumino-silicate glass for lamp bulbs that have molybdenum components, said glass containing alkaline earth metals and having a composition, in % by weight on an oxide basis, of:
- SiO2
- >58-62
- Al2O3
- 15-17.5
- MgO
- 0.1-<1
- CaO
- 5.5-14
- SrO
- 0-8
- BaO
- 6-17
- ZrO2
- 0-1
- CeO2
- 0-0.3
- TiO2
- 0-5
- MoO3
- 0-2
- Bi2O3
- 0-4
- Σ RO
- 11.6-29,
- wherein RO is an alkaline earth metal oxide.
An alumino-silicate glass for lamp bulbs that have molybdenum components, said glass containing alkaline earth metals and having a composition, in % by weight on an oxide basis, of:
- SiO2
- 59-61
- Al2O3
- 15.3-17.2
- MgO
- 0.2-<1
- CaO
- >8-13.5
- SrO
- 0-8
- BaO
- >7-15
- ZrO2
- 0.05-1
- CeO2
- 0-0.3
- TiO2
- 0-3
- MoO3
- 0-2
- Bi2O3
- 0-4
- Σ RO
- 21-26,
- wherein RO is an alkaline earth metal oxide.
Dependencies are inferred from the claim text.