Sleeve brick is an important refractory material, and its chemical composition has a significant influence on its properties. The following is the main chemical composition of sleeve brick and its influence on performance analysis:

I. Alumina (Al₂O₃)

Alumina is one of the main components of sleeve brick, and its content is usually above 48%. Its impact on performance is as follows:

High temperature resistance: alumina has a high melting point, which can significantly improve the fire resistance temperature of sleeve bricks and make them stable in high temperature environment.

Mechanical strength: Appropriate amount of alumina can improve the mechanical strength of sleeve brick, making it not easy to be damaged during use.

Corrosion resistance: Alumina has good corrosion resistance, which can effectively resist the corrosion of high-temperature slag and molten metal.

II. Silicon dioxide (SiO₂)

Silicon dioxide is another important component in sleeve brick, and its content has the following effects on performance:

Plasticity and formability: proper amount of SiO₂ can improve the plasticity of sleeve brick and facilitate molding.

Fire resistance: too high SiO content will reduce the fire resistance of sleeve bricks, but a proper amount of SiO can form a stable compound with Al₂O₃ to improve the fire resistance.

III. Iron trioxide (Fe₂O₃)

Fe₂O₃ content in sleeve bricks is usually low, and its main effects are as follows:

Coloring: Fe₂O₃ will make the sleeve brick appear red, which will affect the appearance.

Fire resistance: too high Fe₂O₃ content will reduce the fire resistance of sleeve bricks.

IV. Calcium oxide (CaO)

CaO is usually regarded as a harmful component in sleeve bricks, and its content needs to be strictly controlled:

Sintering performance: too high CaO content will narrow the sintering temperature range and make the sintering process difficult.

Fire resistance: CaO will reduce the fire resistance of sleeve bricks and increase the risk of expansion and deformation at high temperature.

V. Magnesium oxide (MgO)

MgO content also needs to be strictly controlled, and its main effects are as follows:

Frosting phenomenon: MgO may cause "frosting" on the surface of sleeve brick, which will affect the appearance and quality.

Fire resistance: too high MgO content will reduce the fire resistance of sleeve bricks.

VI. Other ingredients

Sulphuric anhydride (SO): The content should be controlled at a low level, otherwise it will lead to volume expansion during sintering and affect the quality.

Loss on ignition: Too high loss on ignition may indicate that there are many organic substances or impurities in the raw materials, which will affect the final performance of the sleeve brick.

VII. Summary

The chemical composition of sleeve brick has a direct influence on its performance. High content of alumina can significantly improve its high temperature resistance, corrosion resistance and mechanical strength, while other components such as silica, ferric oxide, calcium oxide and magnesium oxide need to be strictly controlled to ensure the overall performance and service life of sleeve bricks.