Drying control chemical additives for rapid production of large

Details Drying control chemical additives for rapid production of large Drying control chemical additives for rapid production of large

1984-02-27

1989-07-25

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

264 42, 501 12, B01J 1300, B29C 3902

Patent

active

048511501

ABSTRACT:
Large sol-gel derived silicon-containing monoliths are prepared with the use of drying control chemical additives selected from the group consisting of glycerol, formamide, oxalic acid and acids of the formula C.sub.n H.sub.2(n-1) O.sub.2 N to control the ultrastructure of the gel solid and pore phases. Gelation, aging, drying, and densification of the sol-gel derived monoliths may be performed rapidly in tens of hours instead of tens of days without cracking, final densification at temperature of 800.degree. C. to 1200.degree. C. or less being possible. The silicon-containing monolith comprises a ternary SiO.sub.2 --B.sub.2 O.sub.3 --Na.sub.2 O system.

REFERENCES:
patent: 3672833 (1972-06-01), Teichner et al.
patent: 3791808 (1974-02-01), Thomas
patent: 4323381 (1982-04-01), Matsuyama et al.
Gonzalez-Oliver, Glass Ceramic Formation and the Preparation of Glasses by the Sol-Gel Method, in Glass, Aug. 1981, pp. 304, 305, 307.

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