초록 ▼

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

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°to 500°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 50m2/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 m3, and heated to temperatures between 200°to 900°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.

대표청구항 ▼

A method of making a shaped heat-insulating body based on water-insoluble oxidic metal compounds, clouding agents and other additives, comprising the steps of: (a) mixing in a dry state with maintenance of the structure of the compounds, 100 parts by weight of water-insoluble oxidic metal compounds

A method of making a shaped heat-insulating body based on water-insoluble oxidic metal compounds, clouding agents and other additives, comprising the steps of: (a) mixing in a dry state with maintenance of the structure of the compounds, 100 parts by weight of water-insoluble oxidic metal compounds having a BET-surface of 10 to 700 m2/g wherein at least 5% by weight of the total weight of these compounds have a BET-surface of at least 50 m2/g said water-insoluble oxidic metal compounds being selected from the group consisting of silicon and aluminum compounds; 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 m0.1 to 30 parts by weight of an additive selected from the group consisting of borides, boron carbide, and a combination thereof capable of forming a solid oxide with a standard formation enthalpy of less than minus 900 kJ/Mol.; (b) transferring the mixture into a mold of desired shape; (c) compressing the mixture to density of between 0.15 to 1 g/cm3; and (d) heating to temperatures of between 200°to 900°C., so that a chemical reaction will take place, thereby obtaining a thermally hardened, non-vitreous body having a porosity of 50-90%, calculated on the total volume of the body, which has a heat conductivity of 0.02 to 0.1 W/Km at temperatures of approximately 300°to 500°C.