Corundum Brick

      Corundum bricks are shaped refractory bricks made primarily from high-purity alumina (Al₂O₃ content typically ≥90%) and subjected to high-temperature firing. They are classified as high-end high-alumina refractory materials. The corundum phase is the main crystalline phase, giving the bricks extremely high refractoriness and excellent chemical stability.

      These bricks are commonly used in the high-temperature working linings of industrial furnaces and kilns. They can be used together with high-alumina bricks, zirconia-corundum bricks, refractory castables, corundum-mullite castables, and other materials to construct durable and reliable furnace linings.
 

Corundum Brick GYZ-95

      The main component of corundum bricks is α-Al₂O₃, a crystalline phase that offers excellent thermal stability at high temperatures, with a theoretical refractoriness exceeding 1800 °C. Compared to ordinary high-alumina bricks, corundum bricks undergo less volume change at elevated temperatures, resist softening and structural collapse, and maintain the integrity of the furnace lining over extended periods. This property is particularly important for equipment operating continuously at high temperatures, helping to minimize unplanned shutdowns.

      In terms of corrosion resistance, corundum bricks demonstrate excellent resistance to acidic and neutral slags, molten metals, and various chemical environments. Their high-density structure limits the penetration of corrosive media, resulting in a longer service life in molten metal, non-ferrous metal smelting, and other high-temperature reaction environments. Under harsh conditions, their service life can typically exceed that of clay bricks or ordinary high-alumina bricks by more than 30%.

      From a mechanical performance perspective, corundum bricks possess high compressive strength at room temperature and good wear resistance, making them suitable for applications with strong material erosion or high load-bearing requirements. With proper furnace lining design, corundum bricks can serve as the core working layer, forming composite structures with wear-resistant refractory castables, silicon carbide bricks, and other materials, further enhancing the overall stability and economy of the furnace lining.

      Additionally, Shandong Haixin Refractory Materials utilizes a complete raw material system and strict quality control to finely regulate the purity, particle size distribution, and firing process of corundum bricks, ensuring consistent product performance and providing reliable support for large-scale engineering projects.

      Corundum bricks typically have a true specific gravity ranging from 3.5 to 3.9 g/cm³. Performance varies significantly depending on the manufacturing method. There are two main categories of sintered products.

      One category uses fused alumina sand as the aggregate, with alumina powder and a small amount of clay as binders. This type exhibits good thermal shock resistance due to high porosity and coarse particles, but the aggregates are loosely bonded and provide low erosion resistance. Therefore, it should not be in direct contact with molten metal. Significant particle shedding occurs when used in the upper lining, so this type is rarely applied.

      The other type is made from high-pressure molded alumina powder with low porosity, as low as 5%. This type of brick has excellent erosion resistance but poor thermal shock resistance.

      Recently, a type of corundum brick containing a small amount of Y₂O₃ has been developed. It features a well-interlocked crystal structure, providing good resistance to both erosion and thermal shock, demonstrating excellent potential for industrial applications.

Q1: What are the main differences between corundum bricks and high-alumina bricks?
A: Corundum bricks contain a higher alumina content, with a crystalline structure dominated by α-Al₂O₃ (corundum). They offer superior refractoriness, erosion resistance, and high-temperature stability compared to ordinary high-alumina bricks, making them more suitable for extreme working conditions.

Q2: Can you provide customized specifications?
A: Yes. We support the custom production of non-standard sizes and corundum bricks with special performance characteristics to meet the requirements of different furnace structures.

Q3: Are corundum bricks suitable for long-term, continuous high-temperature operation?
A: Yes. With a stable α-Al₂O₃ corundum phase as the main crystalline structure, these bricks exhibit minimal volume changes under long-term high temperatures and resist softening or creep. They are especially suitable for continuously operating ladles, refining furnaces, and high-temperature reactors.

Q4: Is it necessary to use special refractory mortar during masonry?
A: It is recommended to use high-alumina or corundum refractory mortar that matches the corundum bricks. This ensures strong joints and overall high-temperature resistance, significantly extending the service life of the furnace lining.

Q5: Can corundum bricks be used in combination with castables or precast components?
A: Yes. They can be combined with materials such as corundum-mullite castables, low-cement refractory castables, and refractory precast components to form multi-layer composite furnace linings, enhancing both stability and cost-effectiveness.

Q6: Are corundum bricks prone to peeling or cracking?
A: When properly constructed and heated, corundum bricks exhibit excellent structural stability. Spalling is usually caused by excessively rapid heating, improper construction, or abrupt changes in operating conditions, and can be avoided by optimizing furnace lining design.

Q7: What is the typical lifespan of corundum bricks?
A: Service life depends on operating conditions. Under normal conditions, corundum bricks typically last 30%–60% longer than ordinary high-alumina bricks, and in certain high-temperature zones, they can maintain stable operation for several years.

Q8: Do you support OEM/ODM cooperation?
A: Yes, we fully support OEM and ODM collaborations. We provide flexible solutions ranging from product customization to full-chain services based on customer requirements.

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