Industry Knowledge of Corundum-Mullite Refractory Castables

Corundum-mullite refractory castables are widely used in various high temperature industrial applications due to their excellent thermal stability, corrosion resistance and mechanical strength. These castables are made of fused corundum and mullite as the main raw materials, along with various additives such as binders, deflocculants and plasticizers. The production process involves mixing the raw materials, adding water and then pouring the resulting mixture into molds.

There are three main grades of corundum-mullite refractory castables: low cement castables, ultra-low cement castables and self-flow castables. The low cement castables contain 3-8% cement binder and are suitable for applications requiring high strength and abrasion resistance. Ultra-low cement castables contain less than 3% cement binder and are ideal for high temperature applications where thermal shock resistance is important. Self-flow castables have a low water content and are designed for easy installation in complex shapes.

When it comes to technical parameters, corundum-mullite refractory castables have excellent thermal shock resistance, high mechanical strength, and low porosity. They also have a high cold crushing strength, which means they can withstand heavy loads without breaking. Other important technical parameters include thermal conductivity, density and linear shrinkage.

The production process for corundum-mullite refractory castables involves several steps, such as raw material selection, mixing, curing, and firing. The quality of the final product depends on the selection of high-quality raw materials, accurate proportions, proper mixing procedure, and controlled curing and firing conditions.

In conclusion, corundum-mullite refractory castables have become an essential material in many high temperature industrial applications due to their excellent thermal and mechanical properties. With the development of new raw materials and production technologies, the application of these castables will continue to expand in the future.