Study On Fabrication And Properties Of PZT/PMnS-PZN-PZT Piezoelectric Ceramic Fibers And Piezoelectric Ceramic Fiber Composites

Interdigitated electrodes piezofiber composite(IDEPFC) which adopts the technology of the combination of ceramic fibers and interdigitated electrodes(IDEs) is the latest development trend of fiber/polymer piezoelectric composites. It combines high piezoelectric properties of piezoelectric ceramic and flexibility of polymer, and the driving and orthotropic properties are greatly increased. The composites are widely used as the sensing and driving element in dynamic structural health monitoring, structure damping, and the controlling of pilotless plane. They can also be used on the shape-changing structures and the application of the piezoelectric materials have been enlarged greatly.In this article, PZT5and PMnS-PZN-PZT piezoelectric fibers with different cross-section shape and different diameters were fabricated by visous polymer processing(VPP). The PFCs were prepared by arranging fibers and casting epoxy resin and the interdigitated electrodes were fabricated by the method of screen printing. The effect of sintering condition, corss-section shape and fiber diameter on fiber phase, microstructure, piezoelectric and ferroelectric properties were studied. The influence of the fiber’s properties, the fiber content and the composite’s thickness to the ferroelectric property of composite were analyzed. Specific work and conclusions are as follows:1. PZT5and PMnS-PZN-PZT piezoelectric fibers with cross-section shape of rhombic and circular were fabricated by VPP. The influence of sintering temperature to fiber structures and properties were studied. The rusults show that, with enough lead provision when sintering and in a range of sintering temperature, we can get pure perovskite phase. The phase, microstructure, piezoelectric and ferroelectric properties of the fibers change with different sintering temperature and the performance changes a little. Fiber cross-section shape and diameter almost have no effect on the optimum sintering temperature. The optimum sintering temperature of PZT5fibers is from1250℃to1280℃, PMnS-PZN-PZT fiber is from1210℃to1230℃.2. Cross-section shape and diameter of fiber have effect on fiber’s performance. The results show that, with the decrease of fiber diameter, the remnant polarization of the PZT5and PMnS-PZN-PZT fibers are increased and their piezoelectric induced strain coefficients d33are decreased. To PZT5piezoelectric fiber, those which have cross-section shape of rhombic have worse piezoelectric and ferroelectric properties than those in the same size with circle cross-section shape. To PMnS-PZN-PZT fiber, those which have rhombic cross-section shape have higher piezoelectric and ferroelectric properties than those in the same size with circle cross-section shape.3. The piezoelectric and ferroelectric properties of fibers are different with different materials. The performance of PZT5piezoelectric fiber is better than that of PMnS-PZN-PZT fiber with the same cross-section shape and the same size. Material’s properties decide the properties of the fibers.4. The PFCs were prepared by arranging fibers and casting epoxy resin and the interdigitated electrodes were fabricated by the method of screen printing. The effect of fiber’s performance on the property of the composite were studied. The results show that:the ferroelectric property of single fiber affect the composite’s property directly. The remnant polarization of composites with the fibers PZT5-Φ360(Pr=41μC/cm2) and PMnS-PZN-PZT-Φ260(Pr=9.85nμC/cm2) are7.8μC/cm2and0.89μC/cm2respectively, and the composites have the same fiber content and the thickness of the composites are lmm and0.9mm respectively.5. The influence of the fiber content, the thickness of polymer, fiber cross-section shape and diameter size to the ferroelectric property of the composite were analyzed. The results show that, the composite with larger fiber content and thinner polymer thickness has better ferroelectric property. The remnant polarization of the composite with PZT5fibers are7.8μC/cm2and11.3μC/cm2, the composite had the same fiber content and polymer thickness are0.32mm and0.17mm respectively. The remnant polarization of the composite with PMnS-PZN-PZT fibers are0.27μC/cm2and0.09μC/cm2respectively, and the composite have the same polymer thickness and the fiber spacing are0.5mm and2mm respectively. The influence of fiber cross-section shape and diameter size to the property of composite can be ascribe to the polymer thickness and contact area between the electrodes and fibers.