| 摘要 |
<p>A method and apparatus 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 0.2 to 0.1 W/K.m at temperatures of approximately 300 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 m2/g, with the provision that at least 5% by weight of these compounds have a BET-surface of at least 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 of 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/cm3, and heated to temperatures between 200 to 900.degree.C so that a chemical reaction will take place. The cooled heat-insulating body so formed mat be used as a structural element in the building industry, for electrical devices and for various installations.</p> |
