Cracks may occur in refractory lining during service, so it is very important to know the extent of refractory resistance to crack propagation.
The advantages of advanced pourable system over compact conventional castables and bricks can be easily seen by comparing the WOF values. Low Cement Castables have the best fracture resistance below 1100 C. Ultra-low cement and cement-free products produce better values at higher temperatures. The main advantage of these castables for users is that they are tougher than other similar refractories such as bricks, plastic refractories or traditional castables.
Many applications of refractory castables require wear resistance or corrosion of castables. Most of these applications are in the range of moderate to low temperatures (below 1100 degrees Celsius). For wear-resistant applications, advanced pourable systems such as low cement, ultra-low cement, high cement, low moisture and chemically bonded castables are used.
The thermal conductivity trend of dense aluminosilicate and high alumina refractory castables is similar to that of refractory bricks and easy to predict (with the increase of alumina content and density, the thermal conductivity also increases).
Like insulating castables, very high alumina castables have much higher thermal conductivity due to the higher amount of crystallized alumina. Compared with traditional dense castables, the increase of thermal conductivity (20% to 30%) caused by adding silicon powder can be seen in low cement and high cement low moisture castables.
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