铁电陶瓷颗粒填充压电复合材料的微结构与性能

Microstructure and Properties of Piezoelectric Composites Filled with Ferroelectric Ceramic Particles

采用模塑工艺制备了含铁电陶瓷PZT颗粒填充的PZT/P(VDF -TrFE)压电复合材料。用差热分析研究并确定了复合材料的固化工艺参数 ,测试并研究了压电复合材料的电性能和显微结构。结果表明 ,随着PZT质量百分比的增加 ,电性能参数逐渐增大 ,当PZT的质量百分比达到 85 %时 ,介电常数ε和压电常数d3 3 值最大。铁电陶瓷颗粒分布均匀 ,当PZT含量较低时 ,两相材料界面结合良好 ,而当PZT含量达到 90 %时 ,气孔则明显增多 ,这就是导致复合材料的介电常数和压电常数在PZT高含量区下降的主要原因。

Piezoelectric composites with different contents of ferroelectric ceramic particles(PZT) were prepared by Mould Compression Technique.Curing parameters of the composite were analyzed and determined by TG DTA, then its microstructure and properties were investigated. Test results showed that the corresponding electric parameters increased gradually with increasing of PZT. When the PZT is up to 85 %, the dielectric constant ε and the piezoelectric constant d 33 reach their maximum. And the well distribution was found in the composites with ferroelectric ceramic particle inclusion. The less the content of PZT is, the better the adhesion of interface between the two phases gets. When the PZT reaches 90 %, significant increase in the pore was found, which leads to the decrease of the dielectric and piezoelectric constants of composites.