Preparation of monolithic silica aerogels, the aerogels thus obt

Details Preparation of monolithic silica aerogels, the aerogels thus obt Preparation of monolithic silica aerogels, the aerogels thus obt

1982-06-01

1984-02-21

McCarthy, Helen M.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423335, 501 12, C01B 3316, C01B 3312

Patent

active

044329563

ABSTRACT:
The invention relates to a process for the preparation of monolithic silica aerogels by drying silica gels under hypercritical conditions, which is characterized by the absence of washing of the silica gel, a high heating rate in the autoclave and purging of the autoclave after substantial removal of the solvent. Other preferred conditions are the use of an amount of water not exceeding 1.5 times the stoichiometric amount for the hydrolysis, hypercritical conditions corresponding to a temperature of 265.degree.-275.degree. C. and to a pressure of 150-200 bars, and so on. Use of the aerogels for the preparation of silica glass bodies or articles and of heat-insulating materials.

REFERENCES:
patent: 2093454 (1937-09-01), Kistler
patent: 4327065 (1982-04-01), von Dardel et al.
B. E. Yoldas, J. Material Science, Dec. 1977, pp. 1203-1208.
Insulation Journal, vol. 24, No. 12, Dec. 1980, p. 1.
Kingery et al., Introduction to Ceramics, 2nd Ed., Wiley-Interscience, New York, 1976, pp. 484-486.

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