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

制备了以压电和导电颗粒为填充材料的新型聚合物复合材料PZT/LDPB/CB。该材料的阻尼机理是独特的，即施加的振动能首先通过压电粒子的压电效应转化为电能，再通过导电粒子形成的导电网络的电流将电能转化为焦耳热。结果表明：(1)声阻抗(2)机电耦合因子(3)电阻率是影响其阻尼效率的主要因素。BaTiO3/LDPE/VGCF复合材料在晶体色散区具有突出的阻尼性能，而BaTiO3/ CPE/VGCF复合材料在室温区由于CPE与BaTiO3的相互作用而表现出较好的阻尼效果。在聚合物基体中具有最有效阻尼作用的压电粒子的最佳电阻率与畴尺寸之间的关系表明，DZ、BPSR等有机分散型介质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基体与介电体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。阻尼系数随电介质尺寸的减小而增大。用VGCF填充有机杂化材料是一种具有高模量和高阻尼性能的新型材料。

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.