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Study of Mechanical Vibration Energy Damping Properties of Carbon Fiber Reinforced Composite Filled with Ferroelectrics

铁电体填充碳纤维增强复合材料机械振动能量阻尼性能研究

基本信息

批准号：
09450250
负责人：
SUMITA Masao
金额：
$ 6.27万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

New polymeric composites filled with piezoelectric, and electrical conductive particles, PZT/LDPB/CB, were made. The damping mechanism of the material is unique one, i.e.,the applied vibrational energy is first transformed into electric energy by the piezoelectric effect of the piezoelectric particle and the electric energy is further transformed into Joule's heat due to the current through the electrical conductive network which was formed by the electrical conductive particles. It was found that three factors effect their damping efficiencies, i.e., (1) acoustic impedance (2)electro mechanical coupling factor (3) resistivity. BaTiO3/LDPE/VGCF composites have prominent damping properties in the crystalline dispersion region, on the other hand, BaTio3/CPE/VGCF composites show better damping effect in the room temperature region due to interactions between CPE and BaTiO3. From the results of the relationships between optimum resistivity and domain size of piezoelectric particles which has most effective damping effect in the polymerc matrix, organic dispersion type dielectrics, such as DZ,BPSR, were found to have better damping properties in the composites. The damping properties of this organic hybrid material depends on its phase structure formed by interactions between matrices and dielectrics. Hydrogen bond is one of the most important interactions of this hybrid systems. The damping factor is increased with decrease of the size of dielecrics. The organic hybrid material filled with VGCF can be a new material which has high modulus and high damping properties.

制备了一种新型的压电导电复合材料PZT/LDPB/CB。该材料的阻尼机制是独特的，即，所施加的振动能首先通过压电颗粒的压电效应转化为电能，并且由于通过由导电颗粒形成的导电网络的电流，电能进一步转化为焦耳热。结果表明，影响其阻尼效率的因素有三个，即，(1)声阻抗（2）机电耦合系数（3）电阻率。BaTiO 3/LDPE/VGCF复合材料在结晶分散区具有显著的阻尼性能，而BaTiO 3/CPE/VGCF复合材料由于CPE与BaTiO 3之间的相互作用，在室温区具有更好的阻尼效果。从最佳电阻率与聚合物基体中最有效阻尼作用的压电颗粒畴尺寸之间的关系中发现，有机分散型压电颗粒如DZ、BPSR在复合材料中具有较好的阻尼性能。这种有机杂化材料的阻尼性能取决于其由基体和基体之间的相互作用形成的相结构。氢键是该杂化体系中最重要的相互作用之一。阻尼因子随介质尺寸的减小而增大。VGCF填充的有机杂化材料有望成为一种高模量、高阻尼的新型材料。