High-alumina bricks are widely used in high-temperature industrial applications such as masonry for blast furnaces, hot blast stoves, electric furnace tops, rotary kilns, and other high-heat environments. They are also commonly applied as checkered bricks in open hearth furnaces, plug heads in gating systems, and nozzle bricks. Despite their superior performance, these bricks tend to be more expensive compared to clay bricks. Therefore, it's advisable to use them only when the specific requirements of the application cannot be met by clay bricks.
The refractoriness of high-alumina bricks is significantly higher than that of clay or semi-silica bricks, reaching up to 1750–1790°C, making them a premium refractory material. This is largely due to their high aluminum oxide (Al₂O₃) content and low impurity levels, which reduce the formation of brittle glassy phases. As a result, they have 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 silicon bricks. Additionally, high-alumina bricks are less resistant to alkaline slags compared to acid-resistant materials, so they should be used with care in environments where such slags are present.
Overall, high-alumina bricks are an essential component in many high-performance industrial applications, offering excellent thermal stability and durability. Their cost-effectiveness depends on the specific needs of the project, and careful consideration should be given before choosing them over more economical alternatives like clay bricks.
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