Volume 37, Number 5, October 2019
|Page(s)||1011 - 1017|
|Published online||14 January 2020|
Study on Temperature Characteristics of Ceramic Materials for Piezoelectric Actuators and Model Modification
College of Power Engineering, Navy University of Engineering, Wuhan 430033, China
2 Department of Engineering Technology and Application, Army Infantry College of PLA, Nanchang 330100, China
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.
Key words: diesel engine / piezo ceramic / hysteresis loop / strain loop / mathematical model
关键字 : 柴油机 / 压电陶瓷 / 电滞回线 / 应变回线 / 数学模型
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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