Alumino earth-alkali silicate glasses with high thermal capacity for light bulbs

A silicate glass and alkaline earth metal technology, applied in the field of aluminum-alkaline-earth metal silicate glass molybdenum glass, can solve the problem of high investment, achieve the effects of improving production and processing speed, avoiding crystallization, and reducing the loss of refractory materials

Inactive Publication Date: 2005-10-26
TELUKS SHPETSIALGLAS GMBKH
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Problems solved by technology

Therefore, the investment i...

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Embodiment Construction

[0050] The present invention is specifically illustrated with the following examples:

[0051] In order to ensure direct use, 3.5 tons of glass in the example are melted in a glass melting tank and drawn into a glass tube.

[0052] The glass melting tank is equipped with combined gas-oxygen and gas-air heating devices. Therefore, gas-oxygen, gas-air heating methods or combined heating methods can be used in heating. This makes it possible to change and adjust the water content in the glass by adjusting the partial pressure in the furnace gas.

[0053] Quartz powder, alumina, dehydrogenated alumina, boric acid, calcium carbonate, barium carbonate, strontium carbonate, magnesium oxide, zirconium silicate, titanium oxide, zinc oxide, cerium oxide, and the like can be used as raw materials. The starting material is alkaline deficient and of technical purity. Aqueous materials such as aluminum hydroxide are added to control the water content in the glass. Raw materials and pell...

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Abstract

The invention relates to alumino earth-alkali silicate glasses for molybdenum glass fusions in the form of light bulbs, as the outer shell for lamps, in particular for lamps with regenerative halogen cycles at bulb temperatures of from over 550° C. up to 700° C. Surprisingly and contrary to the current expectation it was found that alumino earth-alkali silicate glasses with a water content of 0.025 to 0.042 wt. % meet the requirements for halogen lamp glass and do not display any disadvantages due to the presence of the above impurity for the halogen cycle process at bulb temperatures of between 550 and 700° C. In glasses with a water content of from 0.025 to 0.042 wt. % the water present does not act as an impurity in the sense that it does not disturb the equilibrium between formation and decomposition of tungsten halides. A blackening of the inner surface of the bulb does not occur, or not a greater degree when compared with bulb glasses with a considerably lower water content.

Description

technical field [0001] The present invention relates to alumina-alkali-earth metal silicate glass molybdenum glass, which can be used to manufacture light bulbs and lamp covers after melting and forming, and is especially suitable for regenerative halogen cycle lamps. The bulb temperature of such lamps will reach 550°C to 700°C. Background technique [0002] The stability of the regenerative halogen cycle in halogen lamps is a prerequisite for the expected service life of halogen lamps. The balance between decomposition and formation of tungsten halides is critical. Trace impurities in lamp glass, filament, and wires can interfere with the halogen cycle process. Due to the high temperature generated during lamp operation and the strong radiation of tungsten filaments, these trace impurities will weaken the halogen cycle process, causing metal tungsten to accumulate on the inner wall of the bulb and make the bulb black. This reduces the power of the lamp and reduces the lig...

Claims

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Application Information

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IPC IPC(8): C03C3/087C03C3/091C03C3/093C03C3/095C03C4/00H01J61/30H01K1/28
CPCC03C3/087C03C4/00H01K1/28H01J61/302C03C3/091
Inventor 安内洛雷·伯格曼汉斯-于尔根·伯格曼
Owner TELUKS SHPETSIALGLAS GMBKH
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