Physical and chemical index of corundum mullite brick
Alumina content of corundum brick is more than 90%, corundum as the main crystalline phase of refractory products. High compressive strength at room temperature (up to 340MPa). High load softening starting temperature (greater than 1700℃),
Corundum brick is an aluminum-silicon refractory product with corundum as the main crystalline phase. Corundum brick has excellent high temperature mechanical properties, good erosion resistance and wear resistance. Raw materials are natural water-containing aluminum oxides such as tridiaspore, diaspore, etc. These hydrates can be heated and dehydrated to obtain alumina (γ-Al2O3). It is then heated to 1450℃ and converted into corundum (α-Al2O3). Because natural corundum and natural pure diaspore reserves in nature are few. Therefore, industrial alumina is used as raw material for the manufacture of corundum. The obtained industrial alumina is mainly α-Al2O3. When γ-Al2O3 is converted to α-Al2O3, the volume shrinkage rate is 13%, and in order to make the α-Al2O3 grain development intact, the raw material needs to be treated with higher temperature. After high temperature sintering, α-Al2O3 grains can grow 25 ~ 40 times.
