In 1970s, mountain type fused cast AZS crown bricks are developed in France. It is a shaped fused cast refractory. 

This AZS brick can be used at 1700℃. Compared to silica bricks, it greatly improves the high temperature resistance. It is light, so it is no need reinforcing the upright columns and braces. 

 

The valley of the mountain type crown brick is filled with aluminum foam. Then it is covered with alumina insulation blankets and lightweight insulation materials. when the temperature is 1500℃, the temperature of the outer surface is only 80 ~ 100℃. At the same temperature, the temperature of the outer surface of 350mm thick silica crown is 320-330℃. The mountain type fused cast AZS crown can reduce the heat loss of the crown by 25000KJ/m2•h. 

 

Since quartz has crystalline transition at 573℃, under 500℃, the temperature should be risen slowly. The mountain type crown has no problem in this regard, so the preheating time is reduced by 1/3. 

 

Zhengzhou Sunrise Refractory Co., Ltd. is a refractory supplier from Zhengzhou, China. We supply a variety of refractory materials for glass furnaces, including fused cast AZS, fused cast alumina block, zircon brick, magnesia brick, etc..