Aluminum-free borosilicate glass and applications thereof

Details Aluminum-free borosilicate glass and applications thereof Aluminum-free borosilicate glass and applications thereof

2008-01-01

2008-01-01

Lorengo, J. A. (Department: 1755)

Electric lamp and discharge devices

With gas or vapor

Envelope composition

C501S065000

Reexamination Certificate

active

07315125

ABSTRACT:
The fluorescent lamp is made with an aluminum-free borosilicate glass having a composition, in percent by weight, based on oxide content of: SiO2, 65-77; B2O3, 7-20; Li2O, 0-2; Na2O, 0-4; K2O, 3-12; MgO, 0-2; CaO, 0-2; with MgO+CaO, 0-3; BaO, 0-3; ZnO, 0-2; ZrO2, 0.8-12; TiO2, 0-10; CeO2, 0-1; and F−, 0-0.6. Preferred embodiments with more than 1% by weight TiO2have especially good UV blocking properties and are especially suitable for lamp glass for backlights. Other embodiments have good sealing properties to tungsten, KOVAR®, and molybdenum and have coefficients of thermal expansion α of 4.7 to 5.3×10−6/K, good chemical resistance, and a working point VAof between 990° C. and 1290° C.

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