Mullite Brick is high alumina refractory whose main crystalline phase is mullite(3Al2O3·2SiO2). The alumina content of mullite brick is around 65%~75. The refractoriness of mullite brick is up to 1790℃ good thermal stability. Mullite bricks are be divided into two kinds, sintered mullite brick and electric cast mullite brick. Mullite refractory bricks are commonly applied in smelting industry, like in the top of hot blast stove,blast furnace shaft, furnace bottom, etc. Mullite brick is made of synthetic mullite as raw material. The main crystalline phase of mullite brick is mullite. The average content of alumina is between 65% and 75%. In addition to mullite, the lower alumina contained a small amount of vitreous phase and calcite.Higher alumina content also contains a small amount of corundum. Mullite brick is widely used in various parts of thermal furnaces in iron and steel, chemical industry, glass, ceramics and other industrial sectors. The refractoriness of mullite brick is higher than 1790℃. The softening of load starts at 1600~1700℃. The compressive strength at normal temperature is 70 ~ 260MPa. The thermal shock resistance ability is good. There are sintered mullite brick and electric mullite brick two kinds of mullite brick.
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