Performance and characteristics of zirconium corundum brick

Fused zircon corundum bricks are used in industrial furnaces such as glass melting furnaces. The parts used in glass melting furnaces are masonry upper pool walls, small furnace flat grate, small furnace stacks, tongue grate and chest wall. The following issues should be noted in the use of fused zirconium alumina bricks:
 
① Irregular changes in thermal expansion. The expansion curve of fused zirconium corundum brick is abnormal at around 1000 ° C, and the Zr02 crystal inside it undergoes a reversible crystal transition with a large volume change. Therefore, ZrO2 containing bricks should not be used at temperatures around 1000 ° C A sharply fluctuating part. When baking the kiln, the temperature change should not be too large at 900 ~ 1150 ℃, generally it should not exceed 15 ℃ / h, and a steady temperature increase is required. To prevent cold wind from blowing in some areas, other bricks should be used to prevent cracking.
 
② Shrinkage. During casting, shrinkage holes often appear at the casting port. Here, there are many air holes in the brick body, and the density is poor. Therefore, the shrinkage holes will be oriented in the kiln when the glass wall is melted. If the casting is facing outward, when the brick body is eroded to a very thin thickness, it will cause the accident of leakage of glass liquid. When used in the flame space of the upper part of the kiln, the service life is very long, and the problem of glass running will not occur. Therefore, the casting port is used outwards to extend the service life.
 
③ eutectic. The fused zirconium corundum brick and the clay brick are co-melted at a high temperature of 1300 ° C. Therefore, when selecting refractory materials, avoid contacting the two refractory materials with severe eutectic phenomena, such as Below the fused zirconium corundum brick, it is most susceptible to erosion by the fused zirconium corundum brick.