Calcium hexaaluminate (abbreviated as CA₆) is a new type of refractory material with excellent properties. The following is the relevant introduction:

1. Basic Information:

   • Crystal Structure: Belongs to the hexagonal crystal system, preferentially forming flaky and plate-like structures perpendicular to the c-axis direction.

   • Basic Properties: Theoretical density is 3.4 g/cm³, melting point is 1875°C, thermal expansion coefficient is 8.0×10⁻⁶ °C⁻¹, and thermal conductivity is 0.30 - 0.35 W·(m·K)⁻¹.

2. Product Features:

   • Crystallizes into a plate-like structure, offering high resistance to thermal corrosion, high density, excellent erosion resistance, good stability in reducing atmospheres, and strong resistance to alkali and lime corrosion.

3. Application Fields:

   • Steel Industry: Can replace materials for ladle preheaters and refractory fiber products, and is used for the inner lining of ladles. Its excellent thermal insulation and thermal shock resistance can withstand rapid heating and cooling processes inside the ladle, thereby extending the service life of the ladle.

   • Aluminum Smelting Industry: Calcium hexaaluminate products, such as bonite castables, have low impurity content, are resistant to molten aluminum penetration, and remain stable in reducing atmospheres. They can replace traditional refractory materials, extending the service life of aluminum smelting furnaces.

   • Ceramic Industry: The SLA-92 thermal insulation castable series of calcium hexaaluminate products can be used for the inner lining of kiln cars, shortening the firing cycle of ceramic products and prolonging the service life of the kiln car linings.

   • Petrochemical Industry: Can be applied to parts in contact with reducing gases such as H₂ and CO, replacing alumina hollow spheres. Its high-purity raw materials, excellent thermal insulation performance, stability in reducing atmospheres, and strong resistance to erosion by alkaline media enable its use in the petroleum and chemical industries.