THERMODILATOMETRIC BEHAVIOR OF PURE AND DOPED ZRTIO4-SNO2

Thermodilatometric tests have been performed to investigate the shrink age of green compacts of pure and ZnO-doped 4ZrO2-5TiO2 SnO2 prepared by dry ball milling, flo-deflocculation and coprecipitation. Experimen ts have shown that the powder preparation procedure has a significant influence on the sintering process. Optimizing the homogeneity composi tion, which is enhanced from dry ball milling to coprecipitation, rais es the starting sintering temperature. The reduction of the dimension of the starting particles increases the sintering rate and the additio n of ZnO favours the shrinkage of the green bodies. Coprecipitated pro ducts lead to the highest final density because the evaporation of tin oxide on firing is reduced.