Characteristics and Application of Mullite Bricks

Mullite Bricks and corundum mullite bricks have the advantages of high load softening temperature, low high-temperature creep rate, and good thermal shock resistance. Widely used in industrial furnaces such as blast furnace, hot blast furnace, glass melting furnace, dry quenching and heating furnace. Mullite Bricks are easily eroded by alkaline refractory bricks at high temperatures. In addition, at high temperatures, mullite can react with water vapor to form Al2O3 and be damaged. Contact RS Refractory Supplier for more.

mullite brick

Therefore, mullite refractory bricks are not suitable for long-term use in environments with high alkaline slag and high water vapor content.

In addition to mullite and its composite refractory bricks composed of corundum, mullite can also be used to form refractory bricks with other materials to improve its performance. Such as zircon mullite refractory brick, mullite-silicon carbide refractory brick and so on. Zircon mullite refractory brick is mullite-zirconia composite material. However, because zirconia is expensive, in actual production, zircon mullite clinker or refractory bricks are often prepared by reacting Al2O3 or alumina with zircon.

The manufacturing methods of such refractory bricks and raw materials include electric melting method and sintering method. Aluminum fused zirconium silicon (AZS) refractory bricks made by electrofusion have been discussed in fused zirconium corundum bricks. Zircon mullite clinker is prepared by calcining Al2O3 and ZrSiO4 ingredients, and then crushing, kneading, molding and firing to obtain zircon mullite refractory bricks, that is, sintered AZS brick.

corundum mullite bricks


Refractory bricks made with sintered or fused mullite as the main raw material can be all mullite, some can be mullite, and some are corundum. The former is called mullite refractory brick, and the latter is called corundum-mullite refractory brick or corundum mullite brick. The production process of mullite refractory bricks is the same as that of high-alumina bricks, and the ingredients are subjected to several processes such as mixing, forming, drying and firing. The firing temperature is related to the composition of ingredients, the purity of the raw materials and the requirements for the performance of the refractory bricks, which is usually 1500 to 1700 ° C.

The Mullite Bricks are mainly used for hot blast stove top, blast furnace body and bottom, glass melting furnace heat storage chamber, ceramic sintering kiln, dead angle lining of petroleum cracking system, etc.  More info at website:

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