冷冻铸造法制备单向多孔铁电陶瓷的高压电灵敏度和流体静力学优值
High piezoelectric sensitivity and hydrostatic figures of merit in unidirectional porous ferroelectric ceramics fabricated by freeze casting
摘要：
采用冰模板法制备了具有定向孔隙率的高性能锆钛酸铅（PZT）陶瓷传感器。为了证明这些材料的增强性能和传感器和水听器应用的潜力，压电电压常数，流体静力学参数和AC电导率作为平行和垂直于冻结温度梯度的方向上的孔隙率的函数进行了研究。随着孔隙率水平的增加，PZT极化平行于冻结方向表现出最高的系数，和流体静力学品质因数相比，致密和PZT极化垂直于冻结方向。这项工作表明，通过冷冻铸造生产的具有对齐孔的压电陶瓷是一系列传感器应用的有前途的候选者，并且相对于冷冻方向的偏振取向可以用于定制传感器和流体静力学换能器应用的微观结构和优化灵敏度。
英文摘要：
High performance lead zirconate titanate (PZT) ceramics with aligned porosity for sensing applications were fabricated by an ice-templating method. To demonstrate the enhanced properties of these materials and their potential for sensor and hydrophone applications, the piezoelectric voltage constants hydrostatic parameters and AC conductivity as a function of the porosity in directions both parallel and perpendicular to the freezing temperature gradient were studied. As the porosity level was increased, PZT poled parallel to the freezing direction exhibited the highest coefficients, and hydrostatic figures of merit compared to the dense and PZT poled perpendicular to the freezing direction. This work demonstrates that piezoelectric ceramics produced with aligned pores by freeze casting are a promising candidate for a range of sensor applications and the polarisation orientation relative to the freezing direction can be used to tailor the microstructure and optimise sensitivity for sensor and hydrostatic transducer applications.
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