PZT－95／5压电陶瓷的冲击波活化改性研究

SHOCK ACTIVATION AND MODIFICATION OF PZT 95/5 PIEZOCERAMICS

研究了冲击波对ＰＺＴ－９５／５压电陶瓷的活化改性作用，对ＰＺＴ－９５／５粉末及块状材料进行动态冲击波加载。实验表明：在合适的条件下，冲击波作用可提高样品的密度ρ，压电应变常数ｄ３３，介电常数ε，降低介电耗损系数ｔｇδ％。通过对样品进行Ｘ射线衍射，扫描电镜ＳＥＭ、透射电镜ＴＥＭ和Ｘ射线光电子能谱ＸＰＳ等微观测试分析，揭示了冲击波改性的机理主要是：晶粒细化，晶界破坏，孔隙增多，缺陷增多，相变产生等。

This paper is about shock activation and modification of PZT 95/5 ceramics.The shock loading experiments of PZT 95/5 powder and block samples show that:in suitable conditions,the density ( ρ) ,piezoelectric strain constant ( d 33 ) and dielectric constant ( ε ) of the samples can be increased and dielectric lost coefficient (tg δ %) be reduced.The results of X ray diffraction,Scan Electranic Microscope and Transmission Electronic Microscope measurement are also given.It is concluded that the mechanism of activation can be attributed to pulverization of crystallites,crystal boundary damage,microcracks,defects increase and phase changed etc.