Production of dehydroxylated glass

Details Production of dehydroxylated glass Production of dehydroxylated glass

1991-12-17

1993-03-09

Lindsay, Robert L.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 311, 65 301, 65900, 65901, 501 12, C03B 37016

Patent

active

051923513

ABSTRACT:
A substantially dehydroxylated glass is formed by impregnating a dry porous silica gel with a nitrogen-containing organic compound in an organic solvent capable of solubilizing that compound. The impregnated gel is then sintered in a non-oxidizing atmosphere to form a substantially dehydroxylated, fully-densified silica glass. The gel is typically formed by a sol-gel process. The nitrogen-containing organic compound can be guanidine compounds, urea, or mixtures thereof.

REFERENCES:
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patent: 4772305 (1988-09-01), Elmer
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patent: 4979973 (1990-12-01), Takita et al.
C. J. Brinker et al., Sol-Gel Science The Physical and Chemistry of Sol-Gel Processing pp. 628-672.
K. Susa et al., "Reduction of Chlorine Content in Sol-Gel Derived Silica Glass," Journal of Non-Crystalline Solids, vol. 79, pp. 165-176 (1986).
T. H. Elmer, "Nitride Glass," VII International Conference on Glass, vol. 1 (1965).
M. Shimizu et al., "Reaction of CCl.sub.4 with SiO.sub.2 surfaces," Journal of the American Ceremics Society, vol. 54, pp. 271-272 (1971).
M. L. Hair et al., "Reaction of Chlorosilanes with Silica Surfaces," Journal of Physical Chemistry, vol. 73, No. 7, pp. 2372-2378 (1979).
T. H. Elmer "Dehydroxylation and Nitriding of Porous Glass by Means of Water-Soluble Nitrogen-Containing Organic Compounds," Glastech. Ber., vol. 60, pp. 399-405 (1987).
T. H. Elmer "Chlorine Treatment of Nitrided Posous Glass," Glastech. Ber., vol. 61, pp. 24-27 (1988) Nr. 1.

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