Mullite (3Al2O3 · 2SiO2) SiO2-Al2O3 system is the only chemically stable high temperature phase, usually by SiO2 and Al2O3 formed by reaction at high temperature. Generally considered advantageous mullite bonded relatively high temperature properties, such as high temperature strength and thermal shock resistance of refractories. Microsilica and cement for the formation of mullite combined SiO2-Al2O3 castable refractories and to discuss the role of low cement castable (LCC) and castable (ULCC) what material formed by mullite Stone combined. Choose white fused alumina as an aggregate, we believe this group of low cement castable (6% cement) and ultra-low cement castable (0.5% of cement) is a typical system.
In only 0.5% of cement, after 1500 ℃ high temperature flexural strength tests with white fused alumina and silica fume-based ultra-low cement castable fracture surface found mullite crystals. Atresia crystal can provide hardness and high temperature anti-split strength, and it is castable result matrix Silica and alumina mullitization of. Silica content is too low or if the cement content is too high, it will not form mullite crystals. On the contrary, there is no strong and firm, forming liquid may cause disastrous reduce high-temperature strength.
Mullite high temperature insulation tiles is the introduction of new technologies, the latest model of energy-saving refractories, high temperature, high strength, thermal conductivity, energy-saving effect is remarkable and so is suitable for medium petroleum cracking furnace, stove metallurgy, ceramics roller kiln, tunnel kiln, drawer kiln porcelain, glass and various furnace crucible furnace lining, direct contact with the flame, by the relevant technical supervision departments to detect and use, the product of similar foreign products technical indicators.