摘要
基于铁电材料冲击波去极化效应的高功率脉冲电源在国防和高新技术领域具有重要应用。PZT95/5铁电陶瓷是目前铁电体高功率脉冲电源应用的理想材料。近年来,多孔PZT95/5铁电陶瓷被发现具有更优异的综合性能而引起广泛关注。本文概述了多孔PZT95/5铁电陶瓷在微结构与性能调控、冲击波加载下的响应行为以及抗冲击损伤机制等方面的最新进展。研究发现,具有合适气孔率和气孔分布的多孔PZT95/5铁电陶瓷具有优异的抗冲击损伤和耐电击穿性能;多孔脆性材料中破碎介质的"滑移与转动"变形机制增强了材料的塑性变形,从而提高了多孔材料的抗冲击损伤性能。最后,简要介绍了BNT基无铅铁电陶瓷以及PIN-PMN铁电单晶在高功率脉冲电源方面应用的研究进展,并对未来研究工作提出展望。
Explosive pulsed powers(EPP) based on the shock-compression-induced depolarization effect of ferroelectric or piezoelectric ceramics are found important applications in the area of high pulsed power supplies. A particular lead titanate-lead zircaonate(PZT) solid solution with a Zr : Ti ratio of 95 : 5, denoted by PZT95/5, was identified as a promising material for this application. Recently, porous PZT95/5 ferroelectric ceramics are attracting more attention due to their enhanced performance under shock compression. In this article, progress of porous PZT95/5 ferroelectric ceramics in the past decades were reviewed. The dependence of porous microstructures, such as porosity, pore size and morphorlogy, pore distribution on the property were emphasized. Porous PZT95/5 ferroelectric ceramics with specific porous microstructure was found exhibiting superior performance under shock wave compression. Theoretical and experimental results found the mesoscopic mechanism for porous PZT95/5 ferroelectric ceramics to exhibit excellent shock damage resistance. In the final section, new ferroelectric candidates, such as BNT-based ferroelectric ceramics and PIN-PMN single crystal, for EPP application were also reviewed and prospective research work in the future is proposed.
引文
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