High-alumina bricks are widely utilized in various high-temperature industrial applications, such as masonry for blast furnaces, hot blast stoves, electric furnace tops, and rotary kiln linings. They also serve as refractory checkered bricks in open hearth furnaces, plug heads in gating systems, and nozzle bricks. However, due to their higher cost compared to clay bricks, they are typically reserved for situations where the performance requirements exceed what clay bricks can provide.
One of the key advantages of high-alumina bricks is their superior refractoriness, which can reach up to 1750–1790°C, surpassing that of clay and semi-silica bricks. This makes them an advanced type of refractory material. The high aluminum oxide (Al₂O₃) content and low impurity levels in these bricks reduce the formation of fragile glassy phases, resulting in a higher load softening temperature than clay bricks. However, since mullite crystals do not form a continuous network structure, their resistance to softening under load is still lower than that of silica bricks. Additionally, their ability to withstand alkaline slags is weaker compared to acid-resistant refractories, making them less suitable for certain chemical environments.
In summary, high-alumina bricks are ideal for high-temperature and high-performance applications but should be used judiciously due to their cost and specific limitations in certain conditions. Understanding their properties and application scope helps in selecting the most appropriate refractory material for each industrial process.
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