冲击加载下PZT95/5铁电陶瓷的脉冲大电流输出特性

Large current out-put of PZT 95/5 ferroelectric ceramics under shock loading

极化了的PZT95/5铁电陶瓷在冲击波作用下发生铁电相到反铁电相的结构相变,释放出被束缚的电荷,流经外电路,形成脉冲电流.基于这一原理,针对低感、低阻负载的要求,对PZT95/5铁电陶瓷LRC电路响应进行了理论分析,并开展了实验研究.实验采用多组PZT95/5铁电陶瓷并联,获得了前沿小于500ns,峰值大于5kA的大电流.

The poled PZT 95/5 ferroelectric ceramic is in ferroelectric （FE） phase, it can be transformed into the antiferroelectric （AFE） phase by shock compression, so the bound charge can be liborated into an external circuit to generate pulses of electrical current. Based on this FE/AFE transition theory, the electrical response of LRC load was discussed, especially for the small resistance （R） and small inductance （L） load in this paper. A set of PZT 95/5 ceramics in parallel connection was devised to generate large pulses of electrical current in two plane-wave tests. The maximum output current reaches above 5 kA, and the corresponding rise time of the front edge is under 50Ore.