Silicon carbide bricks are advanced refractory materials made of SiC as the main raw material. They are widely used in industries like steel, non-ferrous metallurgy, petrochemicals, power, ceramics and aerospace.
Silicon carbide bricks can be classified into 3 types:
- Clay-bonded silicon carbide bricks are manufactured using a combination of coarse, medium, and fine silicon carbide particles, which are mixed according to specific ratios. Clay is added to the mixture, and the resulting blend is shaped using a brick press. The bricks are then dried for 2-4 days before being fired in a tunnel kiln at a temperature of 1400°C. These bricks exhibit high thermal conductivity, low thermal expansion coefficients, excellent thermal shock resistance, and impressive wear resistance.
- High alumina
- High alumina silicon carbide bricks incorporate fine powder into the base material, accounting for 30% of the composition. These bricks are fired at a temperature ranging from 1370-1480°C and maintained at that heat for 6-8 hours. Notable for their excellent thermal shock resistance, high thermal conductivity, and impressive strength, these refractory bricks are a reliable choice in demanding applications.
- Corundum silicon
- Corundum silicon carbide bricks are produced using brown corundum as the aggregate, combined with 10% silicon carbide fine powder. Phosphoric acid serves as a binding agent, and the mixture is pressed and shaped using a brick press. The bricks are dried and fired at a high temperature of 1450°C. These corundum silicon carbide bricks boast high strength, excellent wear resistance, robust slag erosion resistance, and reliable thermal shock resistance.
In summary, silicon carbide bricks have a combination of useful properties that make them versatile refractory materials for high-temperature applications. By varying the bonding method and density, their properties can be tailored to suit different applications.