PZT陶瓷冷烧结工艺的优化与压电性能研究

To improve the density of samples in cold sintering process and enhance the piezoelectric properties, the high piezoelectric coefficient PZT ceramics at room temperature were prepared by surface modification of a lead zirconate titanate PZT powder and optimization of PZT particle size. The cold sintering process of PZT ceramics was optimized. The results show that a Li₂MoO₄ coating with a thickness of 150 nm is formed on the surface of the PZT powder, which is beneficial to the particle rearrangement and the dissolution-precipitation process during cold sintering. A combination of coarse particles [63, 200) μm and fine particles 1-3 μm provides a close connection between the particles due to the fine particles flowing into the gaps and holes between the coarse particles, so as to obtain a high density (6.49 g/cm³) and relative density (85.40%). This increase in density allows the samples to obtain excellent dielectric and piezoelectric properties. For example, the relative permittivity ε_r and loss tangent tanδ at 1 kHz are 66.8 and 0.288, respectively; and the piezoelectric coefficient d₃₃ at 110 Hz is 71 pC/N.