Mullite is a general name of a series of minerals composed of aluminum silicate. It is rare. Mullite is the mineral generated by aluminum silicate at high temperature. Natural mullite crystals are needle-like and tufted. It can be used to produce refractory materials.
Mullite is the only binary compound under atmospheric pressure among Al2O3 -SiO2 binary system, expressed as 3Al2O3-2SiO2. Natural mullite is rare, so it is generally synthesized by the sintering method or fusing method. Its Mohs hardness is 6-7. Its refractoriness is 1800℃. At 1800℃, it is stable, while it is decomposed into corundum and liquid at 1810℃.
Mullite brick is a high quality refractory material. It has a uniform expansion, excellent thermal shock resistance, high softening point under load, small high temperature creep, high hardness and good chemical corrosion resistance. Currently, mullite bricks mainly include high purity fused mullite brick, common fused mullite brick, sintered mullite brick made of natural bauxite ore and light burned mullite brick.
High temperature mullite insulation brick is a new energy-saving refractory material. It has high temperature resistance, high strength, small thermal conductivity and good energy-saving effects. It is widely used in petroleum cracking furnaces, metallurgy hot stoves, ceramics roller kilns, tunnel kilns, porcelain drawer kilns, crucible furnaces and the lining of a variety of electric furnaces. It can contact with flame directly.
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