Fore hearth

Table I shows physical and chemical properties of AZS products considered in this study for superstructure and glass contact applications (for example, breast walls, port arches, jambs, melter pavers, and fore hearth channels). It is clear that the bonded and vibro-cast refractories have lower bulk density, higher apparent porosity, lower thermal conductivity and lower thermal expansion, when compared with the fused-cast refractories. These differences exist despite similar chemistry, for example zirconia content in the range 25-34 weight %.

$Table I shows physical and chemical properties of AZS products considered in this study for superstructure and glass contact applications (for example, breast walls, port arches, jambs, melter pavers, and fore hearth channels). It is clear that the bonded and vibro-cast refractories have lower bulk density, higher apparent porosity, lower thermal conductivity and lower thermal expansion, when compared with the fused-cast refractories. These differences exist despite similar chemistry, for example zirconia content in the range 25-34 weight %.$

The parent glass melt is cooled down to the processing temperature in the fore hearth, homogenized and fed to the rolling machine via a nozzle. The glass flow is controlled by the size of the nozzle gap and the roller velocity. [Pg.73]

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