The segregation of
fused cast AZS is also caused by the glass phase. In theory, alumina, zirconia and silica are not present in the glass phase. When alkali metal oxides (Na2O or K2O) are introduced, most silica will enter the glass phase. The glass phase composed of Na2O is a key component of SiO2 and Al2O3. With the decrease of Na2O, the glass phase decreases. But the increased Na2O can reduce the viscosity of the glass phase.
Impurities such as iron, titanium, calcium, and magnesium should be avoided.
Impurities can increase the glass phase, but reduce the viscosity of the glass phase and contaminate the glass melt.
Silica and Na2O are the main components of the glass phase of the fused cast AZS block. The content of SiO2 and Na 2O and the amount of glass phase. Strictly controlling the content of SiO2 and Na2O is the key to ensuring the performance of the glass phase.
The main components of the fused cast AZS block include oblique zircon, corundum, mullite, glassy phase and pores. In order to reduce and eliminate the residual thermal stress, it is indispensable for the fusion of AZS as a glass phase for thermal stress buffering.
However, too much glass phase will impair corrosion resistance. During the corrosion process, the glass phase emits the first and high temperature glass melt, which will accelerate the corrosion instead. With the exudation of the glass phase, air bubbles are released, which may contaminate the glass melt.
