Blistering Properties Of Fused Cast Refractories

Bubble is one of the most serious defects affecting the quality of glass. Various kinds of mechanism of bubble forming have been studied in this paper. One main mechanism is the bubble formation from the refractory surfaces in contact with the glass melt. The blistering rates of AZS and ZFC fused cast refractories were examined at the temperature range between 1300 and 1500 deg C by the in-situ observation method. Evolved gases from the refractories during heat-treatment were analyzed by TG-MS. From the results obtained it was inferred that the difference of BR of these refractories is mainly due to the difference of amount of matrix glassy phase in the refractories.