September 30, 2025
Alumina corundum bricks are dense refractory products made from high-purity alumina as the primary raw material, with corundum crystals providing the main structural phase. These bricks are engineered to perform under extreme thermal and chemical conditions, making them indispensable in modern industrial furnaces.
The alumina content in alumina corundum bricks generally exceeds 85%, with some specialized grades reaching above 95%. This high Al₂O₃ composition ensures:
Refractoriness above 1800°C, suitable for long-term exposure to severe heat.
High load softening temperature, preventing structural deformation under high pressure and temperature.
Low apparent porosity, typically below 18%, minimizing slag and molten metal penetration.
Excellent cold crushing strength, often exceeding 70 MPa, ensuring mechanical stability in heavy-duty furnace zones.
The dense structure of alumina corundum bricks contributes to their ability to resist thermal shock and cycling. These bricks maintain integrity in environments where furnaces are frequently heated and cooled, reducing the risk of spalling. Their relatively low thermal conductivity compared to common fireclay bricks also contributes to improved thermal efficiency in high-temperature units.
Sintered alumina corundum brick – Produced through high-temperature sintering, offering balance between cost and durability.
Fused alumina corundum brick – Manufactured in electric arc furnaces, providing higher density and superior corrosion resistance.
Chrome-alumina corundum brick – Contains chromium oxide, improving resistance against molten glass and corrosive slags.
Zirconia-alumina corundum brick – Reinforced with zirconia for enhanced performance in glass and non-ferrous metal industries.
Steel Industry: Used in blast furnace hearths, ladle linings, and electric arc furnace roofs, where contact with molten steel and slag is constant.
Cement Kilns: Applied in rotary kiln transition zones and preheater systems, offering abrasion resistance under dust-laden conditions.
Glass Furnaces: Zirconia-modified alumina corundum bricks are essential for regenerators and tank bottoms due to strong corrosion resistance.
Non-Ferrous Metallurgy: Copper, aluminum, and zinc smelting furnaces benefit from their ability to resist penetration by molten metals.
Petrochemical Reactors & Incinerators: Withstand corrosive gases and extreme combustion environments.
Dimensional stability under thermal and mechanical load.
Reduced maintenance frequency thanks to long service life.
Versatility in shaping and customization for complex furnace designs.
Reliable resistance against aggressive chemical attack.
Alumina corundum bricks continue to play a central role in refractory design, meeting the needs of industries that operate at the highest thermal and chemical thresholds. Their balance of strength, resistance, and adaptability makes them one of the most effective refractory materials for severe industrial environments.
