Study of reduced composite PZT for large-displacement actuators

摘要

A new kind of composite piezoelectric ceramics for large-displacement actuators, which are composed of reduced and unreduced layers, was prepared from normal PZT by chemical reduction. The distribution of stress inside the composite PZT was researched and the chemical reduction conditions were explored. The actuating properties of reduced PZT were also studied. It is found that optimal ratio of reduced layer thickness for the composite structure is 0.3; Reduced composite PZT has lower resonance frequency and 3 times larger displacement than that of the traditional PZT; Re-oxide phases are found in reduced layer of composite PZT showing the reduction procedure needs to be improved.