Using alumina hollow spheres as aggregates and adding appropriate amounts of SiO2 and silicate stone to the matrix, alumina hollow sphere bricks with good thermal shock stability and low re firing line change rate were produced.
The main component of ordinary alumina hollow sphere products is Al2O3 (over 98%), and the matrix is composed of α - Al2O3, which is the main raw material causing poor thermal stability of the products. Therefore, when determining the formula, alumina hollow spheres are still used as aggregates, and an appropriate amount of SiO2 is added to the matrix. During the firing process, a certain amount of mullite phase is formed in the matrix to replace corundum phase, thereby improving thermal shock stability. Add a certain amount of silicon wire stone to the matrix to reduce the rate of change in the re firing line of the product and ensure the external dimensions of the product. The use of chemical binders can have adverse effects on the high-temperature performance of products, so chemical binders are not used. From these aspects, the following four formulas have been designed, and the thermal shock stability of their products is in the order of>20 times,>20 times, 5 times, and 1 time.
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