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Properties of glass refractory (such as fused cast azs block, magnesia brick, zircon brick, fused cast α-β alumina, mullite brick, sillimanite brick, fused corundum brick, etc.) include structural property, thermal property, mechanical property, performance property and operating property.

Structural property contains porosity, bulk density, water absorption, air permeability, pore size distribution, etc.

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
If the casting speed of fused cast azs block is too fast, the liquid flows become wide which bring a great impact on the casting mold of fused cast azs

block, then part of casting mold is broken through or melted which can make the this part of mold risen up. In addition, when the wide liquid flow is casted

No matter what kind of magnesia brick, different degrees of crack will be produced in the drying process. There are two types of cracks of magnesia brick, one is mechanical crack, and another is non mechanical crack.

Correct and effective masonry method of refractory not only can prolong the service life of glass furnace, but also can eliminate some stress caused by premature damage. Wrong masonry method of refractory can greatly shorten the service life of refractory materials. The glass refractory usually refers to the high temperature bricks which can be used in liner of glass furnace, such as zircon brick, fused cast azs block, fused cast zirconia block, silica brick, magnesia brick, mullite series brick, etc.

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.

Regenerator chamber of glass furnace should select checker brick with high heating unit area which can minimize the heat of checker as far as possible, in addition, must ensure that the heating furnace lining and the checker brick material on the combustible medium has a high anti - erosion effect.

ZrO2 in zircon brick is about 65% which is almost composed of zirconite crystals and contains only a very small amount of glass phase and free ZrO2. The ture density is about 4.55g/cm3 or so, and the maximum ture density can reach 4.62 g/cm3. The bulk density of zircon is between 3.6 g/cm3 and 3.8 g/cm3, and apparent pososity is above 13%.

All of us has known that fused cast azs block is produced by casting method, which makes the fused cast azs block form many excellent properties, however, the operation in casting process has great influence on the quality of fused cast azs block, and it not only affects the appearance of fused cast azs block, but also directly affects the inner quality of fused cast azs block. The characteristics in casting operation process are as below:

Wear resistance is a mechanical wear ability to resist solid, liquid and dust. In many cases, the damage caused by the mechanical wear of the firebrick surface is often very serious. It is often the direct cause of the working surface loss of a firebrick material. Sometimes, it is more harmful than chemical erosion. For instance, the firebrick liner of superstructure of glass furnace often loss due to lack of wear; the place of air flow scour and melting flow of furnace is also easy to loss due to low wear resistance of firebrick. So, wear resistance of firebrick is an important property.

Refractoriness is different from melting point, melting point is the balance temperature that materials reach to melting point which is between solid and liquid crystal, however, refractoriness is a process in which the solid phase of the material is gradually dissolved in the liquid phase and finally is melted with the increasing temperature.