High-Temperature Sintering and Polarization Process of Additive Manufacturing Barium Titanate Piezoelectric Ceramics
In order to improve the comprehensive performance of BaTiO3 piezoelectric ceramics fabricated by additive manufacturing,the slurry shear thinning characteristics and digital light processing(DLP)forming characteristics of BaTiO3 piezoelectric ceramics were studied in this paper.The densification mechanism of BaTiO3 piezoelectric ceramics green body formed by DLP under different sintering temperature conditions was revealed,and the influence of polarization direction on the piezoelectric properties of BaTiO3 ceramics formed by DLP was explored.The results show that the electrical properties of BaTiO3 piezoelectric ceramics fabricated by DLP additive manufacturing can be improved to a certain extent by adjusting the high temperature sintering and polarization process.When the sintering temperature is 1 420℃and the holding time is 2 h,the piezoelectric coefficient d33 is the largest,which is 163.4 pC/N.The sample layers are tightly bonded and the grain size is uniform.When the angle between Z axis and polarization direction is changed from 0° to 90°,the relative dielectric constant εr and d33 are increased by 29.37％and 27.01％,respectively.When the solid content is 80％(mass fraction),the sintering temperature is 1 420 ℃,and the angle between Z axis and polarization direction is 90°,the sample d33 is the largest,reaching 182.4 pC/N.
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