The sinterability and thermal stability of pure (>99 wt-%), fine (20 μm) zircon containing 1 wt-% of different metal oxides has been studied. Samples were fired up to 1550°C and their densification monitored. The high temperature phases were detected by XRD and the microstructural development of some selected compositions was studied by means of scanning electron microscopy. The results show that, among the oxides studied, Fe2O3, MgO, and TiO2 had the highest densification, although partial dissociation of zircon occurred. These oxides are suggested as sinterable additives to make volume stable sintered aggregates for various refractory applications.
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