polycrystalline mullite fiberIt is a polycrystalline refractory fiber in the form of mullite crystal phase. In fact, it is mainly chemically formulated according to the formation of a single crystal-mullite. What are the functions of polycrystalline mullite fiber.

Polycrystalline mullite fiber is composed of soluble aluminum and silicon salt by high temperature crystal phase transformation. The manufacturing process is to spray and rotate a viscous colloidal solution at a low temperature to form fibrils, and then burn at a high temperature to order the atoms in the fiber and crystallize the tissue. This can also be a good way to eliminate the metastable glass state, the use of temperature can improve the near300C. WithAl2O3increase in content,polycrystalline mullite fiberThe heat resistance is increased. WhenAl2O3content greater72%When, its use temperature can exceed1400C. Today, its polycrystalline mullite fibers come in different shapes. Loose fiber cotton can be used as a filler for interlayers of high temperature parts. Loose cotton can be made into boards, felts, bricks, prefabricated components, modules and other desired patterns by wet vacuum forming. Because the polycrystalline mullite fiber has the characteristics of low heat capacity, low thermal conductivity, low volume density, good heat sensitivity and high radiation capacity, it is an efficient, lightweight and energy-saving material for steel rolling furnace.

Polycrystalline mullite fiber can well improve the service life of furnace roof and burner bricks. After pasting polycrystalline mullite fiber on the inner surface of the furnace roof, the direct scouring of the furnace roof by the furnace gas is improved. In this case, it naturally buffers the rapid cooling and heating of the furnace roof, and the furnace temperature that the furnace roof bears can be reduced70~100C. This can effectively prevent the cracking and peeling of the refractory. Heating furnace from plate and belt plant2005Year3The furnace roof is in good condition except for a few small cracks. In particular, the service life of its furnace roof can be extended5aAbove, save the furnace top maintenance cost at least.80Ten thousand yuan. Due to the characteristics of regenerative combustion technology, the air after heat storage has a great damage to the burner brick. In particular, the burner brick adopts pre-forming technology or on-site casting technology, which is difficult to repair and replace. If polycrystalline mullite fiber is pasted on the surface of the burner brick, the erosion of the flame on the burner brick can be reduced and the burner brick can be effectively protected. Since the fibers are pasted, the burner bricks use2aAfter only a small number of small cracks, polycrystalline mullite fiber life can be extended.4More than years.

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