Mullite insulation bricks are high alumina refractory materials with mullite as the main crystal phase. Generally, the alumina content is between 65% and 75%. In addition to mullite, the bricks with low alumina content has a small amount of glass phase and cristobalite. The bricks with high alumina content has a small amount of corundum. Mullite insulation bricks can be directly used for lining of high-temperature kilns. At present, they have been widely used in linings of shuttle kilns, roller kilns, glass and petrochemical kilns.
Characteristics of mullite insulation bricks
1. Low thermal conductivity, good thermal insulation performance;
2. The low thermal capacity. Due to low thermal conductivity, the mullite insulation bricks accumulate little heat energy, and the energy saving effect is obvious in intermittent operation;
3. Low impurity content. It has very low oxide content such as iron and alkali metals, therefore, its refractoriness is high. Its high aluminum content makes it maintain good performance in reducing atmosphere;
4. Mullite insulation brick has high compressive strength under high temperature.
5. Accurate size. Easy for construction. Save the amount of refractory mud. Ensure the strength and stability of the masonry, thereby extending the life of the lining;
6. Mullite insulation bricks can be processed into special shapes to reduce the number of bricks and joints.
Next issue we will continue to introduce the classification of mullite insulation brick. Please stay tuned.
