The environment of the part in contact with the glass in the clarification part is basically the same as the part in contact with the glass in the melting part, except that this part usually works at a much lower temperature. The maximum temperature of the superstructure of these parts is generally about 1399~1454℃, while the maximum temperature of most glass liquids may reach 1399℃. There is often greater flexibility in selecting refractory materials for these locations because the erosion rate here is much lower. However, the further the molten glass flows toward the forming end of the furnace, the more susceptible the quality of the glass is to defects formed in the refractory material. The main reason for this is that the viscosity of the glass in these areas is higher, and at this lower temperature it is difficult for the glass to assimilate solid defects or gas defects originating from the refractory material. In addition, the glass does not have much residence time to complete the process of assimilating the above-mentioned defects.
The most important parameters to be considered for the refractory materials used in this area are
The resistance of the refractory material to erosion, the possibility of producing stones and bubbles; however, these parameters of the refractory material should be measured at a temperature lower than that of the melting zone.
The possibility of streaks produced by the refractory material is also very important; the color produced by the refractory material in this part of the glass cannot be spread evenly, while the coloring caused by the melting part is possible, and the thermal shock resistance of the refractory material used in the clarification part is not Not very important, since this area generally operates at very steady temperatures, so thermal shock only occurs when the entire furnace heats up or cools down.
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