Sol-gel process of making glass, particulary gradient-index glas

Details Sol-gel process of making glass, particulary gradient-index glas Sol-gel process of making glass, particulary gradient-index glas

1993-06-25

1994-05-03

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 54, 501 55, 65 31, C03C 304

Patent

active

053088026

ABSTRACT:
The present invention relates to a process for making glass by the sol-gel process. A mixture of silicon alkoxide, at least two other metal alkoxides, and alcohol in a solution sufficiently acidic to hydrolyze partially the silicon alkoxide is formed. Water is then added under agitation to convert the metal alkoxides to a network of corresponding metal oxides suitable for gelation. The mixture containing the network of metal oxides is then molded for a sufficient time to form a gel. Substantially only oxides of one of the at least two other metals is then removed from the gel, which is then fixed in a liquid capable of arresting such additional removal. The fixed gel is then dried and sintered to form a glass. The step of removing the at least one other metal oxide from the gel can be followed with a step of withdrawing partially oxides of one of the remaining at least two other metals in order to form a transparent gradient-index glass after sintering.

REFERENCES:
patent: 4686195 (1987-08-01), Yamane
patent: 4797376 (1989-01-01), Caldwell et al.
patent: 4902650 (1990-02-01), Caldwell et al.
patent: 5068208 (1991-11-01), Haun et al.
Mukherjee, S. P., "Gradient Index Lens Fabrication Processes: A Review, in Topical Meeting on Gradient-Index Optical Imaging Systems," Honolulu, Hawaii, Optical Society of America (1981), pp. Tu A1-1 to Tu A1-5.
M. Yamane et al., "Gradient-Index Glass Rods of PbO-K.sub.2 O-B.sub.2 O.sub.3 -SiO.sub.2 System Prepared by the Sol-Gel Process," Journal of Non-Crystalline Solids, 100, 506-10 (1988).
Shingyouchi et al., Electronics Letters, 22:99-100, 1108-1110 (1986).

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