Performance characteristics of chrome corundum refractory bricks

Chrome corundum refractory brick is a high-performance refractory material commonly used in linings and furnaces of high-temperature industrial equipment. Its remarkable high temperature resistance, corrosion resistance and high strength properties make it occupy an important position in many high temperature industrial fields. The following are the main performance characteristics of chrome corundum refractory bricks:

High temperature resistance

Chrome corundum refractory bricks can withstand high temperatures of over 2,000 degrees Celsius. This makes it perform well in high-temperature industrial environments such as metallurgy, glass, cement, etc., and can effectively protect equipment from high-temperature damage.

Corrosion resistance

Chrome corundum refractory bricks have excellent chemical resistance and acid and alkali corrosion resistance, and can maintain their stability and structural integrity in environments containing corrosive gases and chemicals. This makes it particularly suitable for industrial fields with strict corrosion resistance requirements such as metallurgy, nonferrous metals, and petrochemicals.

Thermal shock stability

Chrome corundum refractory bricks have good thermal shock stability and can maintain their structural integrity even in environments with rapid temperature changes. Not only that, the thermal shock stability of chromium corundum refractory bricks varies with the change of Cr2O3 content. Chromium corundum bricks with low content show better thermal shock stability.

High strength and hardness

Chrome corundum refractory bricks have a compressive strength higher than 150MPa, far exceeding that of ordinary corundum bricks. This high strength allows it to withstand high temperatures, high pressures and mechanical shocks, providing a solid barrier for industrial equipment.

The difference between chrome corundum bricks and white corundum bricks

High temperature resistance

Chrome corundum bricks have a refractory resistance of over 1790°C and a refractory resistance of over 1700°C at load temperatures. In comparison, the working temperature of corundum refractory bricks is 1600°C, so the high temperature performance of chrome corundum bricks is better than that of pure corundum bricks.

Compressive strength

The compressive strength of corundum refractory bricks is between 70-100MPa, while the compressive strength of chrome corundum bricks exceeds 150MPa at room temperature. This significant difference mainly comes from the large amount of Al2O3-Cr2O3 solid solution formed during the production process of chromium corundum bricks, which greatly enhances its compressive strength.

Thermal shock stability

The thermal shock stability of chromium corundum refractory bricks will decrease as the Cr2O3 content increases. In particular, chromium corundum bricks with low Cr2O3 content show excellent thermal shock stability. For example, AKZ chromium corundum bricks produced by adding a small amount of phase change additives have excellent thermal shock stability.

Resistance to slag erosion

Corundum refractory bricks are susceptible to slag erosion in high temperature environments, while chrome corundum bricks are almost unaffected, and slag rarely penetrates into the interior of the bricks. Its excellent resistance to chemical corrosion and permeability to gasified slag make it more stable and durable in harsh industrial environments.

Differences in application areas

Chrome corundum bricks are mainly used in glass kiln linings, molten iron pretreatment devices, waste incinerators, gasifier linings and other occasions that require high temperature and high corrosion resistance. In contrast, corundum bricks are mostly used in lower temperature industrial applications such as cracking furnaces and reforming furnaces in the petrochemical and fertilizer industries, steelmaking furnaces and blast furnaces in the metallurgical industry.

In general, chrome corundum bricks have better performance in high temperature resistance and corrosion resistance than corundum refractory bricks, but the cost is also relatively high. Therefore, selecting appropriate refractory bricks based on specific application requirements and temperature conditions can not only improve equipment performance, but also effectively control production costs.