Refractory bricks made from sintered or fused mullite as the main raw material can be entirely made of mullite, or partially made of mullite and partially made of corundum. The former becomes mullite refractory bricks, while the latter is called corundum mullite refractory bricks or corundum mullite bricks. The production process of mullite refractory bricks is the same as that of high alumina bricks, with several steps including mixing, forming, drying, and firing. The firing temperature is related to the composition of the ingredients, the purity of the raw materials, and the requirements for the performance of refractory bricks, usually ranging from 1500 to 1700 ℃.
Mullite refractory bricks and corundum mullite bricks have the advantages of high load softening temperature, low high-temperature creep rate, and good thermal shock resistance, and are widely used in industrial furnaces such as blast furnaces, glass melting furnaces, dry quenching furnaces, and heating furnaces. Mullite refractory bricks are easily corroded by alkaline refractory bricks at high temperatures. In addition, at high temperatures, mullite can react with water vapor to form Al2O3 and be damaged.
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