In ordinary glass furnaces, we occasionally encounter some problems when using fused-cast zirconium corundum bricks. How should these problems be solved? Please let me tell you:
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Irregular changes in thermal expansion
The expansion curve of fused-cast zirconium corundum bricks is abnormal at around 1000℃, and the ZrO2 crystals inside the ZrO2 crystal undergo a reversible crystal transformation and have a large volume change. Therefore, products containing ZrO2 should not be used at around 1000℃, and the temperature is often Parts of sharp fluctuations. When baking the kiln, the temperature change should not be too large at 900~1150℃, generally not more than 15℃/h, and a steady temperature rise is required. Some parts should be protected from cold wind and other bricks should be used to prevent explosion.
Shrinkage
During casting, shrinkage holes often appear at the nozzle, and the brick body has more pores and poor density. Therefore, when laying the glass melting part of the pool wall, the shrinkage holes are directed toward the inside of the kiln. If the nozzle faces outward, the brick body When it erodes very thin, it will cause leakage of glass liquid accident. When used in the upper flame space of the kiln, the service life is very long, and there will be no problem of running glass, so use the sprue outwards to prolong the service life.
Eutectic
The fusion-cast zirconium corundum bricks and clay bricks are in contact with the masonry, and the eutectic phenomenon will occur at a high temperature of 1300 ℃. Therefore, when selecting refractory materials, avoid contacting the two refractory materials with serious eutectic phenomenon, such as silica bricks in fusion casting. Below the zirconium corundum bricks, the most vulnerable to corrosion by the cast zirconium corundum bricks.
