The main varieties are: α-βAl203 bricks, α-Al203 bricks, β-Al203 bricks:
(1) α-Al203 bricks
α-AI203 bricks have no glass phase and are mainly α-Al203, but there is also a small amount of β-Al203 in them. These bricks are stable at 1850℃, and their resistivity is the highest among all materials. Its corrosion resistance to molten glass is lower than that of zirconium corundum materials, but higher than that of β-AI203 materials. Their porosity is also higher. This material has a compact structure and a porosity of less than 5%. Since these materials do not emit a large number of bubbles when in contact with molten glass, they are mainly used in the forming part of the fused furnace that determines the quality of the molten glass.
These bricks usually contain 18%-55% β-Al203 and 2% glass phase. Although their corrosion resistance to glass liquid is not as good as that of corundum bricks, they rarely form bubbles or discharge stones at low temperatures, so they are particularly suitable for the forming part of the kiln.
(2) β-Al203 bricks are particularly resistant to alkaline vapor at high temperatures, so they are suitable for the upper structure of electric melting furnaces, breast walls of flame kilns, small furnaces and bearing parts, but their resistance to glass corrosion is poor.
The crystal phase structure of α-βAl203 bricks is 45%-55% α-Al203 phase and 45%-60% β-Al203 phase. It has strong resistance to glass liquid corrosion (slightly inferior to α-AI203 bricks) and good resistance to alkaline vapor at high temperatures
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