Shaped heat-insulating body and process of making the same

Details Shaped heat-insulating body and process of making the same Shaped heat-insulating body and process of making the same

1986-06-04

1991-01-15

Derrington, James

Compositions

Electrolytes for electrical devices

264 42, 264 43, 264332, 501 80, 501 87, 501 89, 501 92, 501 96, 501 98, C04B 3332, E04B 174

Patent

active

049851632

ABSTRACT:
A method for producing shaped heat-insulating bodies based on water-insoluble oxidic metal compounds particularly of the elements silicon and aluminum, clouding agents and other additives, whereby the bodies are thermally hardened and have a heat conductivity of 0.02 to 0.1 W/K.m at temperatures of approximately 300.degree. to 500.degree. C. and are comprised of (a) 100 parts by weight of water-insoluble oxidic metal compounds having a BET-surface of 10 to 700 m.sup.2 /g, with the provision that at least 5% by weight of these compounds have a BET-surface of at least 50m.sup.2 /g; (b) 0 to 100 parts by weight of mineral clouding agents having at least one absorption maximum in the wave length range of 1.5 to 10 .mu.m; and (c) 0.1 to 30 parts by weight of elements capable of forming a solid oxide having a standard formation enthalpy of less than minus 900 kJ/Mol. In addition, 0-100 parts by weight of mineral fibers can be added. The mixture is then put into a mold of the desired shape, compressed to densities between 0.15 to 1 g/cm.sup.3, and heated to temperatures between 200.degree. to 900.degree. C. so that a chemical reaction will take place. The cooled heat-insulating body so formed maybe used as a structural element in the building industry, for electrical devices and for various installations.

REFERENCES:
patent: 3055831 (1982-09-01), Barnett et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, Second Completely Revised Edition, vol. 18, pp. 134-136 (Copyright 1969).
Handbook of Chemistry and Physics, 55th Edition, Edition, Editor-Robert C. Weast, Ph.D., Published by CRC Press, (1974-1975), p. E-17.

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