What changes will occur to fused zirconium corundum bricks in glass furnaces

What changes will occur to fused zirconium corundum bricks in glass furnaces?


The main components of fused-cast zirconium corundum bricks are alumina, zirconia and silica. The English abbreviation is AZS, which represents the English initials of the main components. During production, alumina, zirconia and silica are put into an electric furnace, melted and then cooled by injection molding. The petrographic structure is composed of the eutectoid of corundum and zirconia and the glass phase, and the glass phase is filled between the two crystals. Fused zirconium corundum bricks are mostly used in the construction of glass furnaces. Different models have different compositions and can be used in the construction of different parts of the glass furnace. The glass kiln in use will withstand high temperatures of thousands of degrees. What changes will the melted and cast zirconium corundum bricks undergo under the harsh test?

The melted and cast zirconium corundum material will undergo a crystallization process in the glass furnace. First, baddeleyite is precipitated in the baddeleyite crystallization space, and then the aluminum-zirconium eutectic is precipitated on the baddeleyite and corundum eutectoid lines. is the glass phase and the remaining crystals. As one of the petrographic structures of fused zirconium corundum bricks, the glass phase can, on the one hand, lower the melting temperature, expand the casting temperature range, and relax thermal stress; but it is also the weak link of fused zirconium corundum bricks, reducing the corrosion resistance of the material.

The cast zirconium corundum bricks will be gradually eroded in the glass kiln. The glass phase is first replaced by the kiln glass, and the corundum begins to dissolve, slowing down the erosion rate of the bricks. After the corundum is exhausted, the cast refractory material begins to disintegrate, and the bricks are eroded obliquely. Zircon enters the kiln and turns into stone. If the refractory components are not mixed evenly after being dissolved, stripes will form. The stripe components are different from those of glass, which can affect the degree of gas dissolution and cause bubbles to precipitate, which will adversely affect the quality of the glass produced; Stones and streaks will also affect the quality of the glass.

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