A shear-bending mode high temperature piezoelectric actuator

Abstract

A single ring-shape ceramic plate piezoelectric actuator operated in shear-bending mode was proposed for high-temperature operation. The actuator was formed from BiScO3-PbTiO3 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 °C was about 20 μm, 11–14 times that of a normal piezoelectric plate of identical size.

Theoretical analysis on shear-bending deflection of a ring-shape piezoelectric plate

“…19 Thus, it verifies the assumption that the actual distribution of piezoelectric coefficient d 15 of the ring-plate in the radial direction is just described as Eq. (11) and Fig.…”

“…The material parameters used for calculations are summarized in Table I. 19 For a rectangular material, it is normally considered as it is uniformly polarized. 21 However, for a ring-plate material, if the polarization is along its radial direction, it should be non-uniform.…”

“…19 It was noted that the displacement of the ring-shaped piezo-plate at ±7.5 kV/cm is about 11-14 times that of the single ceramic plate. In this paper, according to piezoelectric constitutive equations and the classical thin plate and small bending elastic theory, the analytical solutions to the bending deformation of the shear-bending strain mode of the ring-shape piezoelectric plate under electric field and under a concentrated or uniformly distributed mechanical load were found.…”

Reduced dielectric loss and strain hysteresis in (0.97−x)BiScO3–xPbTiO3–0.03Pb(Mn1/3Nb2/3)O3 piezoelectric ceramics

“…In addition, the strain hysteresis under high electric field (50 kV/cm) of BS-PT ceramics is as high as 50%, which is much larger than those of the commercial PZT based materials. The strain hysteresis of piezoelectric actuator made of BS-PT ceramics is obvious, especially under the temperature of 200 1C, which may affect the precision performance of piezoelectric actuators [3]. Introducing Mn, Fe and Pb(Mn 1/3 Nb 2/3 )O 3 (PMnN) in the solid solution was proved to decrease the dielectric loss and increase the mechanical quality factor [9][10][11].…”

“…Recently, it is increasingly recognized that piezoelectric actuators that can function at ambient temperatures above 150 1C without external cooling could greatly benefit a variety of important applications, especially in the fields of automotive, aerospace, and energy production industries [3,4]. These performances require the piezoelectric materials possess high Curie temperature, large piezoelectric constant, low strain hysteresis and/or high mechanical quality factor.…”