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Study on Piezoelectric Damping Properties of Piezoelectric Ceramic/Polymer Composites

Author: YangYiQuan
Tutor: ZhengQiang；DuZuo
School: Zhejiang University
Course: Materials Science
Keywords: Piezoelectric ceramic / polymer composites Damping material Piezoelectric properties Dynamic rheological behavior
CLC: TB332
Type: Master's thesis
Year: 2002
Downloads: 527
Quote: 10
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Abstract


The electrically conductive filler / piezoelectric ceramic / polymer composites systems, according to the piezoelectric principle conductivity, mechanical vibration energy (or acoustic energy) by the piezoelectric effect of the piezoelectric ceramics is converted to electrical energy, and the conductive filler is formed by the system, conductive network, the power dissipated in the form of heat, so as to achieve the effect of reducing vibration and noise. This thesis studies piezoelectric ceramic type, content, conditions and other factors on polarization piezoelectric ceramic / polymer two-component composite piezoelectric properties of the system, based on the rheological behavior affect explores the preparation of high-performance vibration and noise reduction Polymer composite damping component formulations and processes. Studied the piezoelectric ceramic / polymer composites piezoelectric properties of piezoelectric ceramics, and found that different volume fraction of piezoelectric ceramic piezoelectric properties of the composite system of great impact. Choose a high piezoelectric constant and a dielectric constant of piezoelectric ceramic particles as a function of phase, and 60% to 70% of the volume fraction of polymer blends. Its composite materials exhibit high piezoelectric properties and good processability. Explore the polarization condition on whether composite system with piezoelectric properties. The results show that for each piezoelectric composite materials are there is an optimum temperature and optimum polarization electric field polarization (EP). At this point, the piezoelectric ceramics in the system the highest degree of polarization alignment, optimal piezoelectric properties of the composite system. In the saturation field (Es), the piezoelectric constant (d33) with polarization time (tp) and change the polarization of the initial d33 increases rapidly with increasing tp; polarization after a certain time, d33 leveled. Studied the piezoelectric ceramic / polymer composites dynamic mechanical, piezoelectric ceramic found in the polymer dispersion of the polymer and the interaction between the friction composites directly affect (tan6) and dynamic modulus (G,, G ·) size. High structural piezoelectric ceramic particles, the large friction composite system; at high polarization voltage, long polarization time, the piezoelectric ceramic particles dispersed more uniformly in the polymer, a large contact surface with the polymer, the mutual role of strong ; the external force, the system tanb, G,, G · showing large value. SEM photograph partly explains the particle distribution between the binding of the polymer. Conductive filler / piezoelectric ceramic / polymer composite system dynamic rheological behavior results show that the impact of the type of conductive filler composite rheological behavior. Such as carbon fibers can form a three-dimensional network in the polymer, conductivity and excellent performance. By studying the dynamic rheological behavior dependent on the content of the conductive filler, the conductive filler content found in Journal of Zhejiang University added increase, the system there is a change in the dynamic modulus phenomenon that the particles are dispersed in the polymer, filler and aggregate was closely related to the interaction.

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