Bending Behavior of Monolithic Ba(Ti,Sn)O3-Ceramics with a Functionally Gradient of the Piezoelectric Properties

摘要

Functionally Gradient Materials are suitable for bending devices due to reduced internal mechanical stresses and lower production costs. Monolithic BaTi(sub l-x)Sn(sub x)O(sub 3) (BTS) ceramics with a gradient of the Sn-content (0.075 less than or equal x less than or equal .15) were prepared. The chemical gradient was transformed into a gradient of the piezoelectric properties by a poling process. The bending deflection was measured as a function of the applied voltage and compared with analytical approximations. Additionally the resonance frequencies and the damping behavior of samples with different Sn- contents were investigated. The monolithic ceramics showed good results in comparison with conventional glued bending devices.