织构PNN-PZT陶瓷的光固化成型制备及其电学性能研究

为高效制备织构压电陶瓷，以球状Pb(Ni_1/3Nb_2/3)O₃-PbZrO₃-PbTiO₃ (PNN-PZT) 为基体粉体，片状BaTiO₃ （BT）为模板粉体，采用光固化成型技术代替传统流延技术制备织构压电陶瓷。研究了粉体形貌对打印浆料流动性的影响、浆料的光敏参数以及不同BT含量织构陶瓷的晶体结构和电学性能。结果表明，球状粉体浆料具有低黏度的特性，能够有效提高打印浆料的固含量，最大固含量可达86%（质量）。此时陶瓷浆料的临界曝光量与透射深度分别为127.5 mJ/cm²和21.1 μm。打印后的PNN-PZT-BT陶瓷沿00l]_c方向生长，BT模板粉体含量从1%增长到5%，陶瓷的织构度由42%增到92%。当BT含量为3%时，样品具有最高的压电常数d₃₃=1047 pC/N。与传统的流延法相比，SLA技术的工艺优势在于制备周期短，稳定性高，能够有效降低织构陶瓷的制备难度。

Fabrication and electrical properties of textured PNN-PZT ceramics by stereolithography technology

Textured Pb(Ni_1/3Nb_2/3)O₃-PbZrO₃-PbTiO₃ (PNN-PZT) ceramics which were using spherical PNN-PZT powders as matrix and plate-like BaTiO₃ (BT) powders as template were prepared by stereo lithography apparatus (SLA) method. The impact of powder morphology on the fluidity of printing paste, as well as the crystal structure, electrical properties of textured ceramics with different BaTiO₃ contents were investigated. The results show that the spherical powder slurry is characterized by low viscosity, which can effectively increase the solid content of the printing slurry and the maximum solid content is 86%(mass). At this time, the critical energy density and curing depth of the ceramic slurry are 127.5 mJ/cm² and 21.1 μm respectively. Using BT as template can effectively promote the growth of PNN-PZT-BT ceramics along the 00l]_c direction, with the BT content increasing from 1% to 5%, the texture degree of ceramic texture increasing from 42% to 92%. The sample has the highest piezoelectric constant d₃₃=1047 pC/N when the BT content is 3%. Compared with the traditional casting method, the process advantages of SLA technology are that the preparation cycle is short and the stability is high, which can effectively reduce the difficulty of preparing textured ceramics.