Corundum mullite brick And mullite refractory brick has the advantages of high load softening temperature, low creep rate at high temperature and good thermal shock resistance. It is widely used in industrial furnaces such as blast furnace, glass furnace, coke dry quenching furnace and heating furnace. Mullite refractory bricks are easily corroded by alkali refractory bricks at high temperatures. Moreover, at high temperatures, mullite can be damaged by reproducing Al2O3 with steam.
As we all know, mullite is an excellent refractory material. It has the characteristics of large expansion, uniform thermal shock and stability, high softening point of the load, high creep value, high hardness, and good chemical resistance. Now, there are mainly high-purity molten mullite, common electric mullite, all natural bauxite concentrate sintered mullite and light burned mullite. Lightweight mullite aggregate can be quickly oven dried, high altitude rate of exhaust smoother, reduce the time of oven drying, economic benefits significantly improved. The processing temperature is high, which can be directly contacted with flame lining, and can be used for high temperature and energy saving. Low heat conduction, good heat preservation, light weight mullite aggregate proportioning, stable volume, high strength and good structural tightness. The construction component reduces 40--60% and reduces the problem of brick hanging on the top of the furnace.
Sintered mullite is used to produce high temperature refractories. Under the normal pressure of mullite, only two compounds are stable. Natural mullite is very rare. It is usually synthesized by sintering or electrofusion. Refractory bricks made from sintered or electrically melted mullite can be selected from mullite and some mullite can be selected. Some corundum is used as material. The former is called mullite firebrick, and the latter is called corundum mullite refractory brick or corundum mullite brick. The production process of mullite refractory bricks is similar to that of high alumina bricks, and the ingredients are mixing, molding, drying and firing. The firing temperature is related to the composition of the ingredients, the purity of the material and the requirements for the function of the firebrick, usually 1500~1700 degrees.
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