The performance of clay silicon carbide bricks and their application in ladle lining

The performance of clay silicon carbide bricks and their application in ladle lining are as follows:

I. Performance of clay silicon carbide bricks

1•Physical properties: Mohs hardness can reach 9, and wear resistance is excellent. High thermal conductivity, can effectively transfer heat. Small thermal expansion coefficient, good dimensional stability at high temperature, not easy to deform or crack due to temperature changes.

2•Chemical properties: Good stability to acidic slag. When in contact with molten iron, slag, etc. at high temperature, it can maintain good chemical stability and is not easy to be corroded.

3•Thermal properties: High refractoriness, can withstand high temperature in the ladle. Good thermal shock resistance, can withstand the rapid temperature changes generated by the ladle during the filling, transportation and pouring of molten iron.

4•Mechanical properties: High high temperature strength, can withstand the pressure and scouring of molten iron at high temperature.

2. Application of Clay Silicon Carbide Bricks in Ladle Lining

1• Thermal shock resistance: Ladles experience rapid alternation of hot and cold during use. Clay silicon carbide bricks have lower compressive strength than some other bricks, and higher apparent porosity, which is conducive to buffering and releasing thermal stress, reducing layered cracks and peeling.

2• Corrosion resistance: Although the higher porosity may lead to a decrease in erosion resistance in terms of structure, in actual use, the surface is prone to adhere to the iron slag layer, which can fill part of the pores after solidification, play a protective and barrier role, and make it have better slag resistance.

3• Insulation: The higher apparent porosity and lower bulk density give it good thermal insulation performance, which can reduce the temperature drop caused by heat conduction at the bottom and mouth of the ladle, and improve the slag and capping phenomenon at the bottom and mouth of the ladle.

4• Service life and cost: When used in a 150-ton ladle, the average ladle life of the ladle can be greatly increased, and the purchase unit price is cheaper than some bricks, the unit weight is light, and the comprehensive use cost is low.