摘要
采用纳米晶PVC和PVDF两种聚合物为基体,采用复合材料模压工艺制备了PZT/聚合物压电复合材料,研究了聚合物基体和陶瓷体积分数对复合材料的结构及介电、压电和铁电性能的影响。结果表明:增加陶瓷体积分数有助于获得性能优良的压电复合材料。在压电陶瓷高含量区(≥50%),部分压电陶瓷颗粒相互联接,形成了类似0-3(1-3)型复合连通形式,是复合材料获得优良电性能的主要原因。在陶瓷含量相同时,聚合物的性能影响了复合材料的电性能。陶瓷含量为50%时,由于PVDF基体有较高的介电常数,该复合材料体系的矫顽场Ec明显低于PVC体系,但PVC体系显示出较高的剩余极化Pr,这是PVC体系可以获得较高的机电耦合系数的主要原因;采用PVC为基体获得了具有较好的综合机电性能:d33=15 pC.N-1,g33=41.5 mV.m.N-1,Kp=0.226,良好的柔顺性和机械加工性的压电复合材料,有望在水声材料中获得应用。
PZT/Polymer composites were prepared by hot-pressing technique using a novel nanocrystalline PVC or PVDF as matrix. Effects of polymer matrix and volume ratios of piezoelectric ceramics on dielectric, piezoelectric and ferroelectric properties of PZT/polymer composites were investigated. In higher volume ratio （φPZT≥50%） composites, some piezoelectric particles appear to be in contact, electric properties of PZT/polymer composites are higher because the type of 0-3（ 1-3） structure is formed. In same volume ratio composites, the properties of polymer affected theelectric properties of composites. In PZT/polymer （φPZT = 50%） composites, PZT/PVDF composite has a lower coercive field due to PVDF matrix having a higher dielectric constant, but PZT/PVC composite has a higher electromechanical coupling coefficient due to it having a higher remanent polarization. The optimized electric properties are obtained in PZT/PVC （φPZT= 50%） composite： d33 = 15 pC·N^-1, g33 = 41.5 mV· m·N^-1, Kp = 0. 226, it could be used for hydrophone material in the further.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2005年第5期652-656,共5页
Chinese Journal of Rare Metals
基金
国家高技术研究发展计划(863计划)项目资助(2002AA333110)
关键词
聚合物基体
压电性能
铁电性能
水声材料
polymer matrix
piezoelectric property
ferroelectric property
hydrophone material
