Industry Knowledge of Corundum-Mullite Refractory Brick

Corundum-mullite refractory brick is a specialized type of refractory brick that is widely used in high-temperature applications, such as furnaces and kilns. It is a composite material made from corundum and mullite, which are both alumina-based ceramics. This combination results in a strong, durable material that is resistant to thermal shock and chemical corrosion.

The classification of corundum-mullite refractory brick is based on its chemical composition and physical properties. There are several grades, including:

1. High-alumina corundum-mullite refractory brick: This is the most commonly used type and has a high alumina content of 90-99%. It is suitable for applications that require high strength and corrosion resistance, such as in the petrochemical and steel industries.

2. Mullite-corundum refractory brick: This type has a lower alumina content of around 70%, but it has a higher mullite content. It is useful for applications that require good thermal shock resistance and creep resistance, such as in the glass industry.

3. Corundum-mullite refractory brick with chromium oxide: This type contains chromium oxide, which improves its resistance to high-temperature corrosion. It is used in applications where there is exposure to molten metal or harsh chemical environments.

The technical parameters of corundum-mullite refractory brick include its density, porosity, compressive strength, thermal conductivity, and coefficient of thermal expansion. These parameters vary depending on the grade and application of the brick.

The production process of corundum-mullite refractory brick involves several stages. First, the raw materials are blended and mixed to the desired composition. Then, the mixture is formed into the desired shape, such as a brick or tile, using a press or extruder. The formed shapes are then dried and fired in a kiln at high temperatures to achieve the desired properties.

In summary, corundum-mullite refractory brick is a versatile and durable material that is used in a variety of high-temperature applications. Its classification is based on its chemical composition and physical properties, and its production process involves blending, forming, and firing. Understanding the technical specifications of corundum-mullite refractory brick is essential for selecting the appropriate grade for a particular application.