A shear-bending mode high temperature piezoelectric actuator

摘要

A single ring-shape ceramic plate piezoelectric actuator operated in shear-bending mode was proposed for high-temperature operation. The actuator was formed from BiScO_3-PbTiO_3 ceramic and polarized in the radial direction. A large bending displacement at the center of the actuator was piezoelectrically generated under an applied voltage in the thickness direction due to axial-symmetric shear strain of the ring-shape configuration. The displacement obtained at 200 ℃ was about 20μm, 11-14 times that of a normal piezoelectric plate of identical size.