Method of manufacturing quartz glass for a lamp vessel
AssigneeU.S. Philips Corporation
InventorsRobert J. Pet, Josephus J. Timmermans
Life of this patent
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Abstract
The electric incandescent lamp has a quartz glass lamp vessel (1) or envelope (4') around the lamp vessel, which has a red coloured dope in the area at the side of the incandescent body (3). The quartz glass with red dope contains samarium.sup.II oxide, aluminium oxide, titanium dioxide, and silicon dioxide, the analysis of the glass in its oxidized form being Sm.sub.2 O.sub.3 1 to 3% by weight, Al.sub.2 O.sub.3 up to 3% by weight, TiO.sub.2, rest SiO.sub.2, the molar ratio Al/Sm being at least about 2 and the molar ratio Sm/Ti being from 2 to 8.
Claims5
A method of manufacturing quartz glass doped with Sm.sup.II oxide, said method comprising
- providing a mixture of SiO.sub.2 containing 1 to 3% Sm.sub.2 O.sub.3 by weight, up to 3% Al.sub.2 O.sub.3 by weight, and TiO, wherein the molar ratio of Al/Sm is at least approximately 2, and the molar ratio of Sm/Ti lies within the range of 2 to 8,
- heating the mixture so that it melts to form a quartz glass and so that Tio is converted to TiO.sub.2 and Sm.sub.2 O.sub.3 is converted to SmO in an amount sufficient to impart an orange red to dark red color in the glass.
Dependencies are inferred from the claim text.