Study on the Effect of Different Fiber Reinforcement on the Properties of PZT/PVA Composites
The lower mechanical properties of piezoelectric ceramic composites limited their applications.In order to further investigate the influence of fiber type and dosage on the performance of lead zirconate titanate(PZT)/polyvinyl alcohol(PVA)composites,the electrical and mechanical properties of carbon fiber/PZT/PVA and aramid fiber/PZT/PVA composites with different fiber dosage were tested to analyze the influence of fiber type,dosage and volume ratio of PZT/PVA on the dielectric and piezoelectric properties,as well as bending and tensile mechanical properties of specimen,and combined with the electron microscope scanning(SEM)analysis of the influence of the fiber dosage on the properties of specimens.The results show that a small amount of fiber doping can improve the electrical properties of the composites,and the excess fiber makes the pore structure of the composite structure increase,the dielectric constant and piezoelectric constant both decrease,and the dielectric loss increases.7%aramid fiber/0.5 PZT/0.5 PVA,5%aramid fiber/0.6 PZT/0.4 PVA,and 3%aramid fiber/0.7 PZT/0.3 PVA composites have high dielectric and piezoelectric properties.The bending strength of 0.5 PZT/0.5 PVA,0.6 PZT/0.4 PVA,0.7 PZT/0.3 PVA,0.8 PZT/0.2 PVA composites are increased by 10.72%,14.49%,13.85%,and 16.78%,and the tensile strength is increased by 24.04%,14.49%,13.85%,and 16.78%,respectively,at a 9%doping of aramid fibers,23.94%,27.00%and 28.52%,respectively.Fibers form a mesh structure inside the specimen thereby enhancing the mechanical properties of the specimen,and because aramid fibers do not conduct electricity,it is possible to add more aramid fibers than carbon fibers to the composite material,and its mechanical properties will be greatly improved.
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