Preparation and properties of PZN-PZT/PVDF piezoelectric composites modified by graphite

摘要

The graphite-modified PZN-PZT/PVDF composites were fabricated by hot-pressed process using PZN-PZT ceramic powder, PVDF and graphite powder. The effect of graphite content on the electrical properties of the piezoelectric composites was investigated. The results indicated that the piezoelectric constant d_(33) could be enhanced obviously by adding suitable content of graphite into the composites. When 0.8wt% graphite was added, the PZN-PZT/PVDF composites showed the excellent properties: σ=3.31 X 10~(-6)S/m, ε_r=133, tanδ=0.066, K_p=0.228, Q_m=22.8 and d_(33)=40.6pC/N, which showed 28% higher than that of the composites without graphite.