Preparation and Property of BaTiO₃ Ceramics by Ultrafast-High Temperature Sintering

Sintering process directly affects the microstructure and properties of ceramics. BaTiO₃ piezoelectric ceramic was sintered by an ultrafast-high temperature sintering method. The result was compared with that of BaTiO₃ sintered by a conventional furnace sintering method. The effect of sintering current on the phase composition, microstructure and property of BaTiO₃ sintered in ultrafast-high temperature sintering method was investigated. Ultrafast-high temperature sintering suppresses the grain growth. After ultrafast sintering at 180 A for 5 min, the superior property with the dielectric constant of 3450, dielectric loss of 1.89% and piezoelectric constant 283 pC·N^–1 is obtained. The whole sintering time is reduced by 196 times, indicating that ultrafast-high temperature sintering is a promising densification method for functional materials.