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The erosion resistance of fused cast azs block to glass liquid is high, however, as the body of brick is long time in contacting with the solid-liquid interface of hot glass liquid, so it is subjected to large chemical attack and mechanical erosion, which therefore can also cause the damage to the fused cast AZS block. The analysis of erosion process of fused cast AZS block is as follows:

The entire furnace tank from melting tank, cooling tank until the molding part are all in contact with the glass liquid. The temperatures change from 1200℃ to 1600℃ during the whole process when the qualified glass is finished producing from material melting, and the glass liquid is in the convection state. So different parts of glass furnace need different refractory bricks.

A. sidewall brick: sidewall is mainly adopted fused cast azs block, and recently years fused cast α-β alumina is used in sidewall.

Casting technology is a method to manufacture fused cast azs block and there are several steps of casting, however, it has a close relationship with the casting temperature which can determine the quality of fused cast azs block.

fused cast azs block as a refractory block plays an important role in glass industry. The main chemical composition of fused cast AZS block is Aluminium oxide, zircon oxide and Silicon Oxide, and Aluminium oxide has the special property of a relatively high thermal conductivity, zircon oxide has the property of superior mechanical, thermal, electrical, chemical and optical properties. When they are bonded together with special method, their good performance is revealed to fused cast AZS block.

Casting is a technology to produce refractories, like fused cast azs block, fused cast alumina block, fused cast high zirconia block. These bricks can be used in the liner of glass furnace, such the tank bottom, side wall, throat, fore hearth, corner, doghouse,etc.

The specific production flow of casting is as below:

1. Proportion the raw material

According to the quantity of shrinkages, casting of fused cast azs block can be divided into below four styles:

Casting speed directly determines the casting time, and every fused cast azs block has its own best casting time. Unreasonable casting time can cause many defects in the casting.

High casting speed

Casting technology is a method to manufacture fused cast azs block, and there are several steps of casting, however, it has a close relationship with the

casting temperature which can determine the quality of fused cast azs block.

Casting temperature is the stream temperature which is near the furnace at the mouth and is measured by optical pyrometer. When fused cast azs block is

melting, the casting temperature can reach to 1820-1840℃. The viscosity of molten liquid depends on the chemical composition and temperature of the

If you expect the glass furnace to reach the designed service life, you need to know both the appearance quality and inner quality completely of refractory bricks such as fused cast azs block, not only the good properties, but also the weakness, for instance, which parts can have flaws, which parts must be perfect.

Appearance quality

Formation of shrinkage cavity: In the mold, the molten liquid occurs when the self - shaped wall begins to solidify. If the molten liquid reduces caused by the liquid shrinkage and solid shrinkage and don't get added, which will form concentrated shrinkage cavity in the place of final solidification of fused cast azs block.