Abstract
The performance of piezoelectric actuator ceramics under strong electric field(20 kV/cm) and variable temperature (30~150℃) were tested on a piezoelectric ceramic thermo-electro-mechanical multi-field loading test bench. The variation of hysteresis loop, strain loop, free capacitor and dielectric loss tangent with temperature was analyzed. A mathematical model of displacement characteristics of ceramic materials considering temperature effect is established, and the accuracy of the model is verified. The results show that the hysteresis loops become slender with the increasing of temperature, while the residual polarization, maximum polarization and coercive field decrease. The effect of the temperature on the residual polarization and coercive field is stronger than that on maximum polarization. The strain loop presents a typical butterfly curve, and the negative strain decreases gradually to 0.12% with the increasing of temperature. In the unipolar electric field, the residual polarization varies slightly with the increasing of temperature, and the maximum polarization increases about 40%. The piezoelectric constant of the material increases linearly. The free capacitor and dielectric loss tangent increases continuously. The higher the temperature, the greater the increase.
Highlights
The results show that the hysteresis loops become slender with the increasing of temperature, while the residual polarization, maximum polarization and coercive field de⁃ crease
In the unipolar electric field, the residual polarization varies slightly with the in⁃ creasing of temperature, and the maximum polarization increases about 40%
Summary
本文试验研究了压电驱动器陶瓷( PZT) 材料在 强电场(2 kV / mm) 和变温度( 30 ~ 150°C ) 下的电滞 回线、应变回线以及自由电容 CS 值与介电损耗角正 切值 tgδ 的变化规律,探究环境温度对陶瓷材料铁 1.1 多场耦合试验系统 针对 PZT 试件( 如图 1 所示,直径为 10 mm,厚 根据 GB3389⁃2008 中所介绍的压电陶瓷材料的 测量方法,利用 Agilent 4263B LCR 电路电桥对 PZT 试件电参数的自由电容量 CS、损耗角正切值 tgδ 进 行测试,测试设备如图 4 所示。 图 8 给出了不同温度下的双极应变回线 ( S⁃ E) 。 与 P⁃E 回线相对应,在 20 kV / cm 电场下温度 从 30°C 至 150°C 过程中,S⁃E 回线呈现典型的蝶形 曲线,与正常铁电体类似,而负应变( 即:零场应变 与最低应变的差值) 随温度的升高而逐渐下降至 0.12%,如图 9 所示。
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More From: Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University
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