How To Improve The Glass Phase Of Fused Cast AZS Block

SiO2 and Na2O are the main components of the glass phase of fused cast AZS blocks. The content of SiO2 and Na2O is related to the amount of glass phase. Controlling the content of SiO2 and Na2O strictly is the key to ensure the performance of glass phase.
The main composition of fused cast AZS block includes baddeleyite, corundum, a small amount of mullite, glass phase and pores. In order to reduce and eliminate the residual thermal stress, the glass phase is essential for fused cast AZS to act as a buffer for the thermal stress.
However, too much glass phase will weaken the corrosion resistance. In the process of corrosion, the glass phase exudes first and be replaced with the high temperature glass melt, which will accelerate the corrosion. Accompanying the exudation of glass phase, bubbles give off, which will contaminate the glass melt.
The segregation of fused cast AZS is also caused by the glass phase. in theory, Al2O3, ZrO2 and SiO2 do not exist in the glass phase. When the alkali metal oxides(Na2O or K2O) are introduced, most SiO2 will enter the glass phase. Na2O constitutes the key components of glass phase with SiO2 and Al2O3. With the decreasing of Na2O, the glass phase decreases. But increasing the Na2O can reduce the viscosity of glass phase.
Iron, titanium, calcium, magnesium and other impurities should be avoided. The impurities can increase the glass phase but reduce the the viscosity of glass phase and pollute the glass melt.
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