Densification kinetics of ZrO_2-based ceramics using a master sintering curve

摘要

With the aim to know the densification kinetics of ZrO_2-based ceramics a master sintering curve for ZrO_2 containing 3 mol% Y_2O_3 was constructed. Zirconia (3 mol% Y_2O_3) powders were prepared by a chemical method and then they were uniaxially pressed at 200 Mpa. A green density 36% of theoretical density was obtained after pressing. The shrinkage-temperature curves were obtained by dilatometric runs at different constant heating rates: 5°C/min and 10°C/min up to 1500°C. Dilatometric data were used to construct the master sintering curve (MSC) with an energy of sintering Q=500 kJ/mol between 600 and 1100 °C. The results of this study can be used to predict the shrinkage/densification level of ZrO_2 powders, and by this way to design a heat treatment to obtain a bulk ceramic with a predetermined density.