Abstract
AlN with 4 wt.% Y2O3 or CaO were prepared by sintering in dilatometer and conventional furnace up to 1850 °C. The aim of this work was to compare the sintering behavior and mechanisms related with the densification of AlN with Y or Ca-containing additives. The sample with Y2O3 approached 33% of total densification by solid-state sintering process preceding the liquid phase formation, which was near 1700 °C. After the formation of liquid an overheating of only 50 °C was needed for this sample to achieve full density. The sample with CaO formed liquid-phase near 1400 °C, but required a higher overheating (>300 °C) in order to achieve full density. The densification of the sample with CaO was retarded by: (i) high viscosity of the liquid-phase formed below 1600 °C; (ii) formation of large pores; and (iii) gas entrapped inside the pores.
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