Additives selection added into refractory brick

Resin-bonded carbon magnesia brick because of their excellent thermal shock resistance and slag resistance has been applied in the steel industry in particular, basic oxygen furnace and electric arc furnace. Carbon has excellent performance: as high thermal conductivity, low coefficient of thermal expansion, high thermal shock resistance, while the poor wettability slags it has good resistance to corrosion and erosion resistance.

Ceramic material ( SiC, carbon silicon oxide) to make coatings on graphite or carbon fiber sheet, impregnated with phosphate, cement foam board price and the use of the surface glaze. These expensive methods have certain limitations in the use of the refractory bricks and a method of fine particles by a steam treatment to boron, TiB2, ZrB2, and SiC and other materials for thermal barrier coating on a graphite or carbon composite material.

One method commonly used in refractory bricks is to add the antioxidant materials of fine-grained, such as adding SiC, B4C, metal Al, Mg, and (or) Si or the like to prevent or limit the carbon MgO-C bricks at a high temperature (> 1400 ℃) oxidation. Similarly, these additives are expensive, and can not completely prevent the oxidation of the carbon at a low temperature. The coating solution of 60% solids and 40% of the liquid blend, wherein the liquid binding agent is a mixture of phosphoric acid and ethanol (30% liquid solution). After the MgO-C bricks overcoat thickness of about brushing 0.8mm, samples was coated with the coating were dried at room temperature of about 10min. In practice, pre-heating the ladle after 5h to 1200 ℃, due to some difficulties in the steel making process may take longer.