Abstract: The group of inventions relates to the refractory materials industry, in particular to the production of refractory high-strength nonconductive articles of corundum and silicon carbide concretes on an aluminophosphate binder. The objective of the proposed group of inventions is to provide shaped thermoinsulative and thermoconductive concretes based on an aluminophosphate binder with high strength characteristics, enabling the concretes to be used as building and construction materials operating at high temperatures. According to the first variant, the thermoinsulative concrete based on an aluminophosphate binder includes a phosphate binder and a mixture, wherein orthophosphoric acid is used in a concentration of 65-75% as phosphate binder and a mixture of different fractions of 25A grade electrocorundum is used as the mixture.

Abstract: The invention relates to the field of resistance heating in industrial resistance furnaces and, more specifically, to monolithic cement thermal heating blocks. The monolithic thermal heating block having a heating element disposed therein, the symmetry axes of which coincide with the symmetry axes of the monolithic thermal heating block, is made of nonelectrically but thermally conductive refractory phosphate cement. The heating element comprises a zigzag-shaped filament heater and strip terminals, wherein the area and circumference of the filament and the area and circumference of a terminal are in a ratio of not less than 1:4, and the sites where the filament heater is connected to the terminals are in the form of conical recesses in the monolithic thermal heating block. The technical result of the invention is the production of a monolithic nonelectrically conductive heating block that combines high efficiency, reliability, and manufacturability.

Abstract: The group of inventions relates to the refractory materials industry, in particular to the production of refractory high-strength nonconductive articles of corundum and silicon carbide concretes on an aluminophosphate binder. The objective of the proposed group of inventions is to provide shaped thermoinsulative and thermoconductive concretes based on an aluminophosphate binder with high strength characteristics, enabling the concretes to be used as building and construction materials operating at high temperatures. According to the first variant, the thermoinsulative concrete based on an aluminophosphate binder includes a phosphate binder and a mixture, wherein orthophosphoric acid is used in a concentration of 65-75% as phosphate binder and a mixture of different fractions of 25A grade electrocorundum is used as the mixture.