铁电陶瓷脉冲耐压失效分布及耐压可靠性  

Failure distribution and reliable analysis of ferroelectric ceramics under pulsed electric field

作　　者：张福平[1] 李玺钦[1] 杜金梅[1] 刘雨生[1] 叶福庆 Zhang Fu-Ping;Li Xi-Qin;Du Jin-Mei;Liu Yu-Sheng;Ye Fu-Qing(D&M Center of Equipment and Engineering,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院流体物理研究所,产品工程设计与制造中心,绵阳621900

出　　处：《物理学报》2024年第10期315-320,共6页Acta Physica Sinica

基　　金：中国科学院无机功能材料与器件重点实验室开放基金(批准号:KLIFMD202310)资助的课题。

摘　　要：铁电陶瓷在高电场下的击穿问题是困扰铁电陶瓷应用的关键问题之一.本文统计了铁电陶瓷在正向脉冲电场(4.5 kV/mm)失效概率与脉冲次数的分布关系,对通过第10次脉冲耐压样品第11次的失效概率进行了分析,开展了铁电陶瓷经历万次以上的脉冲耐压后压电常数与电滞回线测试研究.结果表明:铁电陶瓷的击穿概率与脉冲加电压次数曲线呈现典型的浴盆曲线分布,经历10次脉冲高压测试合格的样品,其脉冲耐压失效概率相比于未经历脉冲高压陶瓷样品,降低了4个数量级以上,且上述脉冲高压加载接近无损.考虑到裂纹扩展速度,多个缺陷导致的裂纹同时扩展并连通是铁电陶瓷在脉冲高电压下断裂的主要原因.Dielectric breakdown at high electric field plays an important role in the application of ferroelectric ceramics.In this paper,the failure probability versus electric shock time of ferroelectric ceramics under positive pulse electric field is analyzed statistically.The failure probability distribution of ceramics after 10 electric shocks is studied.Piezoelectric constant,P-E loop of ferroelectric ceramics after 10 thousand electric shocks are measured and the breakdown mechanism is discussed.The results indicate that the relation between failure probability and electric shock number of ferroelectric ceramics is shown by a bath-tube curve and the failure probability of samples after 10 electric shocks decreases by 4 orders of magnitudes compared with that of origin sample.According to the results of piezoelectric constant and P-E loop,the samples subjected to positive pulse electric field many times do not show obvious fatigue or aging effect.So pulse electric field loading at 4.5 kV/mm is close to non-destructive condition.Considering the spread speed of cracks,it can be found that the rupture of ferroelectric ceramics under pulsed electric field roots from extension and connection of multi-cracks from multi-defects.

关 键 词：铁电陶瓷 脉冲电场 失效概率 

分 类 号：TQ174.1[化学工程—陶瓷工业]