Mullite bricks have high refractoriness, which can reach above 1790℃. The starting temperature of load softening is 1600～1700℃. Compressive strength at room temperature is 70～260MPa. Good thermal shock resistance. There are two types of sintered mullite bricks and fused mullite bricks. Sintered that are made of high-alumina bauxite clinker as the main raw material, adding a small amount of clay or raw bauxite as a binder, and forming and firing. Fused it use high alumina, industrial alumina and refractory clay as raw materials, add charcoal or coke fine particles as reducing agents, and are manufactured by reduction fusion method after molding.
The crystallization of fused mullite is larger than that of sintered mullite, and its thermal shock resistance is better than that of sintered products. Their high temperature performance mainly depends on the content of alumina and the uniformity of mullite phase and glass distribution. Mainly used for hot blast stove top, blast furnace body and bottom, regenerator of glass melting furnace, ceramic sintering kiln, dead corner furnace lining of petroleum cracking system, etc.
