Abstract
Methods of chemical phase analysis and radiography were used to determine the sequence and rate of the solid-phase reactions developing in mixtures of Nd2Zr2O7 with SiO2 at 1200–1600°C. It was established that the cubic solid solution in fine-ground mixtures of SiO2 with ZrO2 stabilized with 12 mole % Nd2O3 is decomposed rapidly at 1750°C and forms tetragonal ZrO2 which on cooling is converted to monoclinic ZrO2. An investigation of the influence of the added SiO2 on the properties of zirconia refractories showed that with 20% of the neodymium stabilizer combined with the silica the thermal-shock resistance and strength of the refractory increase appreciably. Data was obtained relating to the nature and degree of the interaction of a melt of quartz glass with ZrO2 stabilized with Nd2O3. The rate of wear of this type of zirconia refractory depends mainly on the rate of the reaction of the SiO2 with the Nd2O3 stabilizer. The process does not result in the contamination of the molten glass.
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