Antioxidant coating for surface of aluminum oxide-silicon carbidee-carbon brick

Abstract

The invention relates to an antioxidant coating for the surface of an aluminum oxide-silicon carbidee-carbon (ASC) brick. The antioxidant coating is aqueous paste substance formed by mixing a component A and a component B by a weight part proportion of 100:101.5-102.5, wherein the component A is powder formed by mixing 50-70 parts by weight of glaze powder, 2-5 parts by weight of alpha-AL2O3 micro-powder, 1-7 parts by weight of bentonite powder, 1-3 parts by weight of SiO2 micro-powder and 26-35 parts by weight of silicon carbide powder; the component B viscous fluid formed by dissolving 1.5-2.5 parts by weight of carboxymethyl cellulose into 100 parts by weight of water, and the glaze powder in the component A is fine powder prepared by drying and grinding an material formed by mixing, melting and quenching 40-60 parts by weight of borax, 12-18 parts by weight of quartz, 8-15 parts by weight of sodium carbonate, 12-15 parts by weight of calcite and 8-12 parts by weight of albite. After coated with the antioxidant coating, ASC bricks of the lining of a torpedo type mixed iron car has the service life prolonged at least for 50 heating numbers, which saves the refractory material.

Description

technical field [0001] The invention relates to an anti-oxidation paint used on the surface of alumina-silicon carbide-carbon bricks, in particular to an anti-oxidation paint used on the surface of alumina-silicon carbide-carbon bricks used for inner lining of torpedo type mixed iron vehicles. Background technique [0002] The torpedo-type mixed iron car is a device for transporting molten iron or desulphurizing, desiliconizing and dephosphorizing the molten iron. Its lining alumina-silicon carbide-carbon bricks (hereinafter referred to as ASC bricks) are carbon-containing unburned bricks. When the interior of the torpedo type mixed iron car is built with ASC bricks and the furnace mouth is poured with the furnace mouth material, it must be baked for about 100 hours according to the oven curve from room temperature to about 900 ℃, and then the molten iron can be filled while it is hot . However, in the process of using coal gas or natural gas as fuel and using oxygen in the...

AI Technical Summary

Problems solved by technology

However, in the process of using coal gas or natural gas as fuel and using oxygen in the air to support combustion, the surface of ASC bricks (because ASC bricks contain carbon) will inevitably be oxidized and corroded.

Usually, after about 100 hours of open flame baking, the ASC brick working surface is oxidized to a depth of 25-30mm. This layer of oxide layer has a loose structure and low strength, and is easily penetrated and eroded by molten iron, and it cannot withstand high-temperature molten iron. scour

It can be seen that the ASC bricks lining the torpedo type mixed iron car are damaged during the oven process, which will inevitably lead to a shortened service life of the torpedo type mixed iron car