Journal de Physique IV

Sommaire

J. Phys. IV France 123 (2005) 171-176
DOI: 10.1051/jp4:2005123029

Study proprietes of porous piezoelectric ceramics and impregneed with polymere

K. Boumchedda¹, J. Paletto² and G. Fantozzi²

¹ Laboratoire LMMC, Université de Boumerdes, 35000, Algérie
² INSA de Lyon, Bât. 502, 69621 Villeurbanne, France

Abstract
Interconnected Porous piezoelectric ceramics are fabricated over the range of porosity going from 25 % to more than 95 % starting from sintering of PZT-glucose mixtures. For a large porosity The ceramic has a cellular structure similar to that of a sponge. Porosity seems not affected $d_{\hbox{\scriptsize\itshape 33}}$ , whereas d_h and k_t increases and kp decreases with porosity. The presence of interconnected porosity in ceramics causes a decoupling of the piezoelectric effects axial and radial for to privilege the axial mode. For a large porosity the transducer vibrates exclusively according to the axial. The polymer introduction into empty ceramics affects negatively the dielectric and piezoelectric properties, the dielectric losses increase whereas $d_{\hbox{\scriptsize\itshape 33}}$ decreases strongly for cellular ceramics.