Low temperature production of high purity fused silica

Details Low temperature production of high purity fused silica Low temperature production of high purity fused silica

1975-09-15

1977-11-22

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

106 3835, 264 56, C04B 3514

Patent

active

040596583

ABSTRACT:
The instant invention is directed to the production of high purity fused silica bodies by means of a three-step process. In the first step, various specifically-defined ratios of aqueous alkali metal silicates with colloidal silica or quaternary ammonium silicate are gelled with certain organic reagents. In the second step, the gelled silicate mass is leached in weakly acid solutions to yield bodies of very high porosity, i.e., greater than 50%, with mean pore diameters ranging between about 400A-4000A, but wherein the pore diameters are extraordinarily uniform within a particular body. Lastly, the microporous body is fired briefly at temperatures above about 1350.degree. C. to consolidate the body to a solid transparent fused silica article having alkali metal contents less than 100 parts per million (PPM). The size of the pores, combined with the exceptional uniformity of pore sizes within an individual unit, is vital to achieve crack-free, homogeneous products.

REFERENCES:
patent: 3678144 (1972-07-01), Shoup

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