Fabrication of 0.655Pb(Mg_(1/3)Nb_(2/3))O_3-0.345PbTiO_3 functionally graded piezoelectric actuator by tape-casting

摘要

A 0.655Pb(Mg_(1/3)Nb_(2/3))O_3-0.345PbTiO_3 (PMN-0.345PT) functionally graded (FG) piezoelectric actuator was fabricated by tape-casting. The effects of sintering temperature on the physical and electrical properties of the PMN-PT ceramics were initially investigated. High dielectric and piezoelectric properties of d_(33)=700pC/N, k_p= 0.61, ε_r=4.77 × 103, tanδ=0.014, P_r=30.68 μC/cm~2 were obtained for the specimens sintered at 1200℃. Compared with the traditional solid-state reaction, the properties of the ceramics were significantly enhanced by tape-casting. The new FG piezoelectric actuator consisted of four layers, and the variation of changes in their d_(33) and ε_r were graded opposite the thickness direction. The relationship between displacement and voltage for the actuator was also determined, with the results showing that it was linear. The driving displacement of the free end of the actuator reached 430.668 μm.