多层铁电陶瓷击穿分析及优化

建立了多层串联PZT95/5爆电换能组件3维数值模型，对固化封装条件下陶瓷介质击穿问题进行了计算分析，计算结果表明：在不改动器件外部结构尺寸条件下，采用等厚度PZT95/5叠片结构布局对进一步提高输出电压方面存在瓶颈。为克服上述影响以及降低爆电换能组件击穿概率，提出了PZT95/5铁电陶瓷非等厚度布局解决方案。为实现上述设想，通过引入不等式约束条件计算得到一组非等厚度优化布局，将爆电换能组件所用PZT95/5铁电陶瓷数量减至19片，同时有效实现该布局下，各片PZT95/5陶瓷电压均低于对应厚度击穿电压的优化目标。

Electric field analyses and optimization of multilayer ferroelectric ceramics

The lead zirconate titanate PbZr0.95Ti0.05O3(PZT95/5) ferroelectric ceramics are generally used in the explosive-electric transducer, as multilayer PZT95/5 thin films arrangement to realize high voltage output. However, the dielectric breakdown of the ceramics needs to be taken seriously. A quasi-static electric field model has been developed for voltage distribution analysis of multilayer PZT95/5 ceramics compressed by shock wave in the normal mode. The calculation results reveal that the electric potential difference of PZT95/5 films increases nonlinearly from ground electrode to output electrode. Since the thickness of ceramic materials has an effect upon dielectric strength, it is a suitable way to avoid device dielectric breakdown by designing carefully the nonuniform layout of PZT95/5 thin films. By using inequality restriction, anonuniform layout optimization of PZT95/5 films arrangement is obtained, which reduces the layer number to 19 and makes the voltage of each layer of PZT95/5 element being lower than its breakdown voltage.