Novel composite coating layer and preparation method thereof

Abstract

The invention provides a novel composite coating layer; a selected binder is high-temperature-resistant phosphate, and a filler is selected from a high-temperature refractory powder and fibers (including high-temperature-resistant inorganic silicate fibers and related organic fibers); the novel composite coating layer comprises, by the weight percentage, 10-50% of a phosphate binder, 20-70% of an alumina powder, 1-30% of a coarse-particle refractory powder, 1-30% of a long fiber filler, and 1-10% of an organic binder. The novel composite coating layer comprises the following main performance indexes: the volume weight after the novel composite coating layer is dried at room temperature is 1500-2500 kg / m<3>, the compressive strength is 1-26 MPa, the breaking strength is 1-15 MPa, the heating linear shrinkage is 0-3%, the solid content is 60-95%, the discretionary reduction is 2-30%, the viscosity is 10000-100000 MPa*s, and the using temperature is 800-1400 DEG C. The novel composite coating layer has the advantages of excellent thermal shock resistance and air flow scouring resistance, prevents a fiber furnace lining in a high temperature furnace from directly making contact with a severe environment in the furnace, so as to prolong the service life of the furnace lining, and improve furnace heat-preservation and heat-insulation effects.

Description

technical field [0001] The invention relates to the technical field of thermal insulation and refractory materials, in particular to a new type of composite coating, which is mainly used for the protection of high-temperature furnace lining materials, especially in various industrial high-temperature furnace industries with relatively high furnace temperature and relatively harsh ambient atmosphere in the furnace. Background technique [0002] The new composite coating is currently mainly used on various high-temperature furnace linings, especially in all high-temperature-resistant furnaces such as iron and steel metallurgical furnaces, heavy non-ferrous metal metallurgical furnaces, chemical industry furnaces, and industrial calcining kilns. , Fiber lining with low thermal conductivity, or other types of high-temperature lining, although these linings have better thermal insulation effect, but under the action of harsh atmosphere, wind speed, slag erosion and thermal shock, ...

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Problems solved by technology

[0002] The new composite coating is currently mainly used on various high-temperature furnace linings, especially in all high-temperature-resistant furnaces such as iron and steel metallurgical furnaces, heavy non-ferrous metal metallurgical furnaces, chemical industry furnaces, and industrial calcining kilns. , Fiber lining with low thermal conductivity, or other types of high-temperature lining, although these linings have better thermal insulation effect, but under the action of harsh atmosphere, wind speed, slag erosion and thermal shock, after a certain period of use, it will Crystallization, pulverization, and slag drop, thereby destroying the overall structure of the furnace lining and reducing the service life of the high-temperature furnace

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