Mullite insulation brick is a high-quality refractory material widely used in emerging industries. It has the characteristics of uniform expansion, excellent thermal shock stability, high load softening point, low high-temperature creep value, high hardness, and good chemical corrosion resistance. The classification of mullite insulation brick is mainly divided into light and heavy mullite bricks according to their density, and into 1350 mullite brick, 1450 mullite brick, 1550 mullite brick, etc. according to their usage temperature.
The performance and application of mullite insulation bricks: high refractoriness, up to 1790 ℃ or above. The starting temperature for load softening is 1600-1700 ℃. The compressive strength at room temperature is 70-260MPa. Good thermal shock resistance. There are two types of bricks: sintered mullite bricks and fused mullite bricks. Sintered mullite bricks are mainly made from high alumina bauxite clinker, with a small amount of clay or raw alumina added as a binder, and are formed and fired. Electric melted mullite bricks are made from high alumina, industrial alumina, and refractory clay as raw materials, with the addition of charcoal or coke particles as reducing agents. After forming, they are manufactured using the reduction electric melting method. 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 the distribution of mullite phase and glass. Mainly used for hot blast stove top, blast furnace body and bottom, glass melting furnace heat storage chamber, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.
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