PZT、PVDF铁电材料力电耦合性能的鼓包法测试分析

发布时间：2018-03-30 18:43

本文选题：鼓包法　切入点：PZT　出处：《湘潭大学》2015年硕士论文

【摘要】：压电、铁电材料在国防、电子、工业等方面有着广泛的应用,对高科技新型产业的发展具有重大影响。铁电材料的关键参数及力电失效机制的分析对提高材料的应用范围以及其可靠性具有至关重要的意义。本文首先发展了一种基于鼓包法的铁电材料力电本构测试模型,可用于测试力电耦合作用下新型铁电材料的弹性刚度系数、压电系数和弹性模量;自主完善了鼓包实验测试系统,完成了PZT-4压电陶瓷、PZT薄膜和PVDF薄膜材料的力电耦合鼓包测试,并获得了以上三种材料的弹性刚度系数、压电系数和弹性模量;进一步分析了在不同力电耦合作用下材料的电滞回线特征,讨论了剩余极化、矫顽场、饱和极化三个关键参数的演变情况。具体工作内容如下:第一,建立了铁电材料鼓包断裂测试的本构模型。基于传统的鼓包法,对铁电材料的鼓包测试模型进行推导。以铁电陶瓷为例,根据材料的特性结合其系数矩阵以及传统鼓包法的力学模型,对力电耦合作用下铁电陶瓷的本构方程进行推导,得到了在力电耦合作用下铁电材料的鼓包模型,进而得到铁电陶瓷的弹性刚度常数以及压电系数。该模型可用于测试新型铁电及铁电复合材料在力电耦合下的性能参数,为测量新型铁电材料的性能提供一种实验测试手段。第二,利用改进的鼓包力电耦合测试装置分析了商业化PZT-4陶瓷片的力电耦合性能。根据不同电场强度下材料的压力-挠度曲线,结合鼓包力电耦合模型得到PZT-4陶瓷片的弹性刚度系数13c的值为10 212.56′10 N m。结合实验数据对压电系数13e进行计算,结果表明压电系数13e的值随着外加电压的增加而减小。对不同电压下的电滞回线进行测试,结果表明:随着外加压力的增加电滞回线变得扁平,其剩余极化强度、最大极化强度减小,矫顽场的值增大。同时得到PZT-4陶瓷片的弹性模量的值为72.27 GPa,残余应力的值为51.72 MPa。第三,利用改进的鼓包力电耦合测试装置分析了PZT[Pb(Zr0.52Ti0.48)O3铁电薄膜的力电耦合性能。首先在不同压力下对PZT薄膜的电滞回线进行测量,结果表明:随着压力的增加,薄膜材料的剩余极化强度减小,而矫顽场呈现增大的趋势。测量不同外加电场下PZT薄膜的压力-挠度曲线,得到不同电压下PZT薄膜的弹性模量随着电压的变化关系。结果表明:当电压从0 V增加到14 V,PZT铁电薄膜弹性模量值从3.29 GPa增加到5.02 GPa。第四,利用改进的鼓包力电耦合测试装置分析了聚偏氟乙烯(PVDF)高分子铁电聚合物薄膜的力电耦合性能。首先测试了不同压力下PVDF薄膜的压力-挠度曲线,得到其弹性模量的平均值为1.93 GPa。测试不同电压下PVDF薄膜的压力-挠度曲线,分析了PVDF有机薄膜的力电响应行为。计算得到PVDF铁电聚合物薄膜的弹性刚度常数的值c12=1.02×10~9N/m2。并得到压电常数随电压的变化关系,结果表明;当电压为20 V、50 V以及150 V时,压电常数从2-0.466 C/m减小到了2-0.013 C/m,这一结果说明外加电场和双轴拉伸应力的共同作用对铁电聚合物薄膜的压电性能产生了很大影响。
[Abstract]:Piezoelectric, ferroelectric materials in electronic defense, and is widely used in industry and so on, has great influence on the development of new high-tech industry. Analysis of key parameters of ferroelectric materials and force electricity failure mechanism has important significance to improve the application range of materials and its reliability. This paper develops a kind of this the test model of ferroelectric material force bulge on the basis of the method can be used to test the mechanical and electrical coupling model of ferroelectric materials under the elastic stiffness coefficient, piezoelectric coefficient and elastic modulus; self perfect bulge test system, completed the PZT-4 piezoelectric ceramics, PZT film and PVDF film material force electric coupling bulge test, and obtained more than three kinds of materials of the elastic stiffness coefficient, piezoelectric coefficient and elastic modulus; further analysis in Tongli electric coupling hysteresis characteristics of materials, discusses the remanent polarization, the The coercive field, the evolution of the three key parameters of saturated polarization. The specific work is as follows: first, the establishment of the constitutive model of ferroelectric materials bulge fracture test. The traditional drum kit method based on ferroelectric materials bulge test model was derived. The ferroelectric ceramics as an example, according to the combination of the coefficient matrix and the traditional the mechanical model of drum characteristics of material, the mechanical and electrical coupling constitutive equation of ferroelectric ceramics is obtained under the package model of ferroelectric materials in the drum force electric coupling, and ferroelectric ceramics, elastic stiffness constants and piezoelectric coefficient. The model can be used to test the performance parameters a new ferroelectric and ferroelectric composites in mechanical and electrical coupling, provides a test method for performance measurement model of ferroelectric materials. Second, using the improved bulging force electric coupling test device of commercial PZT-4 ceramic plate Electromechanica performance. According to the material under different electric field strength stress deflection curve, combined with the electric coupling model of PZT-4 ceramic elastic stiffness coefficient 13C value is 10212.56 '10 N M. according to the experimental data to calculate the piezoelectric coefficient 13e of bulging force, results show that the piezoelectric coefficient 13e decreases with the increase of the applied voltage. Test of hysteresis loops under different voltage. The results show that with the increase of the external pressure hysteresis becomes flat, the remnant polarization strength, reduce the maximum polarization, increase the value of coercive field. At the same time get the elastic modulus of PZT-4 ceramics the value was 72.27 GPa, residual stress the value is 51.72 MPa. third, using the improved bulging force electric coupling test device of PZT[Pb (Zr0.52Ti0.48) electromechanical coupling properties of O3 ferroelectric thin film. Firstly, under different pressure on PZT thin film hysteresis loop measurement, The results show that with the increase of pressure, reduce the residual polarization of thin film materials, and the coercivity increases. Measurement of PZT films under different external electric field stress deflection curve, the elastic modulus of PZT films under different voltage with voltage changes. The results show that when the voltage increased from 0 V to 14 V, PZT thin film elastic modulus increased from 3.29 GPa to 5.02 GPa. fourth, using the improved bulging force electric coupling test device of polyvinylidene fluoride (PVDF) electromechanical coupling properties of polymer ferroelectric polymer films. First, PVDF thin films were tested under different pressure stress deflection curve, the average value of the elasticity modulus is 1.93 GPa. PVDF thin films under different voltage stress deflection curve, analysis of PVDF organic thin film force electrical response behavior. The calculated PVDF ferroelectric polymers film elastic stiffness constant value C12=1.02 * 10~9N/m2. and the piezoelectric constant with the voltage dependence results; when the voltage is 20 V, 50 V and 150 V, the piezoelectric constant C/m from 2-0.466 reduced to 2-0.013 C/m, the results show that the combined action of the applied electric field and the biaxial tensile stress has a great influence on the properties of piezoelectric the ferroelectric polymer films.

【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34

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