铁电材料的疲劳失效行为

The fatigue failure behaviors of ferroelectric materials

在航空航天、核能发电等重大装备技术领域,作为高温传感/驱动/能量收集器件的敏感材料——铋层状结构铁电(BLSF)陶瓷在复杂载荷环境下的疲劳失效问题严重限制着器件寿命和可靠性的提高.本文以BLSF陶瓷的应用需求为背景,围绕铁电材料的疲劳裂纹扩展与电畴极化翻转及其相互作用机制等关键问题,综述了铁电材料在热、力、电三种载荷及其耦合作用下疲劳失效行为的研究现状,并根据当前铁电材料的一些新发展、新应用对其未来研究方向进行了展望,旨在为高性能、长寿命铁电/压电器件设计提供参考.

In the fields of some major equipment technology such as aerospace and nuclear power generation, as the sensitive elements of high-temperature transforming/actuating/energy harvesting devices,the fatigue failure of bismuth layered ferroelectric(BLSF) ceramics seriously restrict the improvement in the life and reliability of devices. This paper is set in the urgent demand of BLSF ceramics, sticking to the fatigue crack growth, domain polarization switching, and interaction mechanisms. It reviewed the progress in the fatigue failure behaviors of ferroelectric materials subjected to three kinds of loadings, including heat, stress, electricity, and their coupled effects. This paper also discusses the research directions of ferroelectric materials in the future according to their new developments and applications. This work aims at providing references for the design of ferroelectric/piezoelectric devices with long life and high performance.