The invention discloses a low-glass-phase fused zirconia
corundum brick with a special structure and a preparation method thereof. The fused zirconia
corundum brick comprises the following chemical components in percentage by
mass: greater than or equal to 32.5% of ZrO2, less than or equal to 15% of SiO2, less than or equal to 1.4% of K2O + Na2O + CaO + MgO, and the balance of Al2O3 and inevitable impurities. In addition, the content of a glass phase of the fused zirconia
corundum brick is smaller than or equal to 20%, and the glass phase is divided into discontinuous blocky areas by a corundum phase in a
microstructure. By optimizing the
raw material ratio and the
casting process, a unique
microstructure is formed in the fused zirconia corundum brick, the glass phase of the fused zirconia corundum brick is uniformly divided into discontinuous areas by a dendritic corundum phase, coarse
baddeleyite grains are accompanied around the discontinuous areas, the
viscosity of the glass phase is remarkably improved by the structure, the flow
connectivity of the fused zirconia corundum brick is effectively limited, and the fused zirconia corundum brick has good
heat resistance. The product has excellent characteristics of high glass phase exudation temperature and low exudation amount, the product is particularly suitable for
flame space parts of the
glass melting furnace,
pollution to
molten glass can be avoided due to the low glass phase exudation characteristic of the product, the quality of the glass product can be improved, and the service life of the furnace can be prolonged.