Method for the preparation of silica glass

Details Method for the preparation of silica glass Method for the preparation of silica glass

1988-09-26

1989-11-28

Lindsay, Robert L.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 311, 65 181, 65 183, 65901, 501 12, C03B 37016

Patent

active

048835218

ABSTRACT:
An improved sol-gel method is proposed for the preparation of a transparent silica gel block, in which a deposit of fine silica particles having a controlled particle diameter as prepared by hydrolyzing an alkoxy silane in the presence of ammonia is dispersed in a silica sol solution prepared in an acidic condition and settled therein to form a structure of closest-packing prior to gelation, drying, sintering and vitrification so that silica glass blocks can be obtained with low volume shrinkage from the wet gel in an improved yield without cracks, bubbles and haziness. The improvement can be further enhanced when two separately prepared deposits of silica particles having larger and smaller particle diameters are dispersed as combined in the silica sol solution, especially, when the particle diameter in one deposit is not exceeding 22.5% of that in the other deposit.

REFERENCES:
patent: 4324576 (1982-04-01), Matsuyama et al.
patent: 4397666 (1983-08-01), Mishima et al.
patent: 4417910 (1983-11-01), Passaret
patent: 4680046 (1987-07-01), Matsuo et al.
patent: 4680048 (1987-07-01), Motoki et al.
patent: 4680049 (1987-07-01), Onorato et al.
patent: 4801318 (1989-01-01), Toki et al.

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