The mineral composition of high alumina brick is determined by the bauxite used, and the mineral composition of clinker is generally mullite, corundum and glass.
The theoretical composition of mullite is Al2O3 71.8%, SiO2 28.2%, and its melting temperature is 1840℃. It has needle-like crystals and has a network cross structure which shows good strength at high temperature. Corundum exists in the form of α-Al2O3, its melting point is 2050 ° C, its hardness is Mohs 9, it is granular and columnar crystal, it has good chemical stability, and has certain resistance to acid and alkaline slag.
The high-temperature mechanical properties are not completely determined by the Al2O3 content in the high-alumina brick, but more by the crystal shape formed and the number of glass phases, composition and viscosity.
Next issue we will continue to introduce properties of high-alumina brick. Please stay tuned.
