Method of making a quartz glass tube having a reduced ultraviole

Details Method of making a quartz glass tube having a reduced ultraviole Method of making a quartz glass tube having a reduced ultraviole

1993-09-13

1995-11-07

Jones, W. Gary

Glass manufacturing

Processes

Forming product or preform from molten glass

65 86, 651341, 651343, 65DIG9, 501 53, 501153, C03B 1514, C03B 516, C03C 304, C04B 3544

Patent

active

054644623

ABSTRACT:
Ultraviolet (UV) radiation in the UV-C and UV-B bands, which is particularly dangerous, is absorbed and filtered by quartz glass doped with between 0.065% and 3.25%, and preferably between 0.065% and 1.3%, by weight, of cerium metal, or cerium as such. Preferably, the cerium is added to quartz sand and/or rock crystal, in form of a fine-grained powder of up to 20 .mu.m grain size, in form of cerium aluminate (CeAlO.sub.3), present in up to about 5% by weight, and preferably up to about 2%, by weight, and melted together in a single step. The quartz glass so obtained is particularly suitable for a metal halide discharge lamp, e.g. as an outer envelope (1), or as the discharge vessel (27) itself, or for halogen incandescent lamps, to form the quartz-glass light bulb or an envelope therefor. A small quantity of titanium oxide, up to about 0.05%, may be added as a further doping agent to the melt to further improve the UV absorption in the B and C bands.

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