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US 4,336,048 AGranted
Method of producing doped quartz glass
AssigneeU.S. Philips Corporation
InventorsGerardus H. A. M. van der Steen, Eddy F. C. Van Hove
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Abstract
Doped quartz glass is produced by fusing a mixture of quartz powder with a concentrate. The concentrate consists of quartz powder and the oxides of alkaline earth metals and/or alkali metals (dopants). By adding a small quantity of dopants, a doped quartz glass can be obtained having a viscosity behavior corresponding to that of Vycor glass. Still softer glasses can be obtained by the addition of some more dopants.
Claims3
A method of producing doped quartz glass having a lower viscosity than that of pure quartz glass comprising:
- forming a concentrate of quartz powder and at least one dopant by sintering or premelting, melting a mixture of quartz powder and said concentrate in an amount containing from 0.035 to 3 mol. % of dopants (computed on the basis of the oxides) in the produced doped quartz glass, and cooling the melt, wherein said quartz powder has a purity of at least 99.99 mol. % as a starting material.
Dependencies are inferred from the claim text.