Influência das temperaturas de síntese e de queima na sinterização de cerâmicas de titanato de bário obtido por via hidrotérmica

Abstract

Fine barium titanium oxide powders were produced by the hydrothermal process in temperatures between 140 and 220°C, and times between 4 and 20 hours, for the critical filling of the autoclaves, and Ba/Ti ratios in the mixture of 1.02 and 2.00. The powders were pressed and sintered at 1180, 1250 and 1320°C for 2,5h and a heating rate of 1°C/min. The densities of the sintered bodies were measured and related to the sintering conditions. Microstructures of the ceramic samples were examined by SEM.

barium titanium oxide; hydrothermal; sintering