With the continuous improvement of refractory material quality and performance, it provides a basic condition for extending the service life of glass furnaces, making them more productive, energy-saving and reducing consumption, and producing high-quality glass products. Based on years of research, this article will discuss the selection of refractory materials for glass furnaces from the perspective of the dynamics of fused cast AZS blocks against glass liquid corrosion, and provide some scientific basis for the correct use of refractory materials in glass factories.

1. Effect of SiO₂ content

2. Effect of carbon content

3. Effect of impurity content and valence state

4. Effect of microstructure

5. Effect of closed pores

6. Film formation reaction of fused cast AZS block

7. Summary

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 1. Effect of SiO₂ content

Fused cast AZS block is mainly composed of

• AZ eutectic (corundum baddeleyite eutectic)
• scattered baddeleyite
• corundum phase 
• glass phase

SiO₂ and trace amounts of B₂O₃, FeO, Fe₂O₃, TiO, TiO₂, ZrO₂, Al₂O₂, CaO, MgO, K₂O, Na₂O, etc. form glass phases, which are filled between the crystal phases.

►If the SiO₂ content is too high, there will be more glass phases. Under high temperature conditions, the volume effect of ZrO₂ turning from monoclinic system to tetragonal system, the oxidation effect of carbon and the expansion effect of pores, etc., cause the glass phase to be squeezed out. A large amount of glass phase seeps out, that is, it wraps in and brings out scattered baddeleyite and incompletely developed corundum phases, thereby destroying the network skeleton structure formed between the crystal phases, causing the erosion rate of the product to accelerate.