Fused zirconium corundum bricks are not only used in places with high temperature and severe corrosion in contact with glass liquid, but also widely used in the upper structure of glass kilns.
Fused zirconium corundum bricks, also known as AZS, are arranged in order of their content according to the three chemical components of the Al2O3-Zr02-Sio2 ternary phase diagram. Al2O3 takes A, Zr02 takes Z, and Sio2 takes S. The standard adopts this abbreviation, such as No. 33 fused zirconium corundum brick, abbreviated as AZS-33#, No. 36 fused zirconium corundum brick, abbreviated as AZS-36#, and No. 41 fused zirconium corundum brick, abbreviated as AZS-41#.
Fused zirconium corundum bricks are made of pure alumina powder and zircon sand containing about 65% zirconium oxide and 34% silicon dioxide, which are melted in an electric furnace and then injected into a mold for cooling to form a white solid. Its petrographic structure consists of the eutectoid of corundum and zirconite and the glass phase. From a phasic point of view, it is the eutectoid of corundum phase and zirconite phase, and the glass phase is filled between their crystals.
Fused zirconium corundum bricks are made by casting the raw materials into a mold after they are completely melted, cooling and solidifying. The shrinkage cavities caused by the volume shrinkage of this product during the condensation process are matters that should be paid special attention to when using it. The casting methods of fused zirconium corundum bricks are ordinary casting, inclined casting, shrinkage-free casting and quasi-shrinkage-free casting.
PT (ordinary casting): The usual casting method, the shrinkage cavities of the product are located at the bottom of the casting mouth, and are mostly used for the upper structure of the melting pool. Etc. parts where erosion is not serious.
QX (inclined casting): using the inclined casting method, the shrinkage hole of the product is offset to the lower end, mainly used as pool wall bricks.
WS (shrinkage-free casting): shrinkage-free products with the shrinkage hole of the cast brick removed, mainly used in areas with severe erosion such as flow holes, kiln sills, pool wall corners, and pavements.
ZWS (quasi-shrinkage-free casting): similar to shrinkage-free casting, basically removing the shrinkage hole of the cast brick, mainly used as pool wall bricks.
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