Silica and Sodium oxide are the main components of the glass phase of fused cast AZS blocks. The content of Silica and Sodium oxide is related to the amount of glass phase. Controlling the content of Silica and Sodium oxide 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, Alumina, Zirconia and Silica do not exist in the glass phase. When the alkali metal oxides(Sodium oxide or Hydroxide) are introduced, most Silica will enter the glass phase. Sodium oxide constitutes the key components of glass phase with Silica and Alumina. With the decreasing of Sodium oxide, the glass phase decreases. But increasing the Sodium oxide 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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