以不同粒径锆钛酸铅(PZT)颗粒和聚偏氟乙烯(PVDF)为原料,制备了0-3型PZT/PVDF压电复合材料,当PZT颗粒平均粒径为1.22μm时,复合材料的压电应变常数(d33)最高。采用流延法制备了石墨烯(GR)添加量不同(0%～0.9%)的0-3型PZT/PVDF/GR三相压电复合材料并进行热压处理;对复合材料的微观结构、介电性能及压电性能进行测定与分析。结果表明:压电复合材料的相对介电常数和介电损耗随着GR添加量的增加而增加;GR添加量为0.6%(质量分数)时,d33达到最大值29.2pC/N,比PZT/PVDF复合材料提高了24.36%。经过热压处理后,压电复合材料的d33提高到31pC/N,添加适量GR以及热压处理可以提高PZT/PVDF/GR压电复合材料的压电性能。
PZT/PVDF 0-3 type piezoelectric composites were prepared by using PZT ceramics with different particle sizes.When the average particle size of PZT was 1.22μm,the piezoelectric strain constant of the composites reached the highest value.The 0-3 PZT/PVDF/GR(graphene) three-phase piezoelectric composites with different graphene content (0%～0.9%) were prepared by tape casting method and hot pressed subsequently.Microstructures,dielectric and piezoelectric properties of the composites were measured and analyzed.The dielectric constant and dielectric loss of the composite increased with the increase of graphene content.The piezoelectric constant reached the maximum when the content of graphene was 0.6wt%,d33=29.2pC/N,which was 24.36% more than those undoped composites.After hot pressing,d33 was increased to 31pC/N.Appropriate addition of graphene and hot pressing treatment resulted in higher piezoelectric properties of PZT/PVDF/GR.
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基金资助
江苏省自然科学基金项目(BK2009718);国家自然科学基金(11272138)
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