Industry Knowledge of Corundum Refractory Brick

Corundum refractory bricks are one of the most commonly used refractory materials in the heat-intensive industries such as metallurgy, petrochemical, and cement production. They are made from high-quality corundum and have high thermal stability, excellent chemical resistance, and high mechanical strength, making them ideal for use in furnaces and other high-temperature applications.

The corundum refractory brick can be classified into four different grades based on their chemical composition, crystal structure, and manufacturing process. These grades are known as normal, high-purity, zircon enhanced, and mullite enhanced. Each grade has its unique properties, which make them well-suited for specific applications.

The normal grade corundum refractory brick is made from fused alumina and has a maximum operating temperature of 1600°C. The high-purity grade is made from high-purity corundum and has a maximum operating temperature of 1800°C. The zircon enhanced grade contains small amounts of zirconium oxide, which increases its mechanical strength and erosion resistance, making it ideal for use in extreme environments. While the mullite enhanced grade is made from a mixture of fused alumina and mullite, which increases its thermal shock resistance and durability.

The technical parameters of corundum refractory bricks are of utmost importance. They include the refractoriness, bulk density, compressive strength, thermal conductivity, and thermal shock resistance. The refractoriness is essential, and a higher degree of refractoriness is often preferred in high-temperature applications. The bulk density and compressive strength are critical in determining the ability of the brick to withstand external pressure, while thermal conductivity regulates the heat transfer through the material. Finally, the thermal shock resistance is critical in preventing the bricks from cracking when subjected to rapid changes in temperature.

The production process of corundum refractory bricks involves several stages, including raw material preparation, shaping, drying, firing, and inspection. The raw materials used include high-quality corundum, high alumina powder, and other additives that increase the physical and mechanical properties of the bricks. The raw materials are mixed, then pressed into molds and dried to remove any moisture. Finally, the bricks are fired in a high-temperature kiln, cooled, and inspected for defects.

In conclusion, the corundum refractory brick plays a vital role in high-temperature environments, and its classification, technical parameters, and manufacturing process are essential factors to consider when choosing the right material for a particular application. The industry is continually improving, and new developments in materials science are poised to make corundum refractory bricks even more effective and durable in the years to come.