The ferroelectric properties of piezoelectric ceramic/polymer composites for acoustic emission sensors

Abstract

Two different mixed connectivity composites, consisting of a ferroelectric ceramic powder of calcium modified lead titanate ( m a ) dispersed in a polymer matrix, have been fabricated and their ferroelectric properties have been investigated. Hysteresis measurements have been conducted on composites of FTCa with a polar polymer of polyvinylidene trifluoroethylene (P(VDF-TrFE)) and PTCa with a thermosetting epoxy resin to determine the coercive fields and remanent polarization of the two different composites. The composites show noticeable differences in their behavior during poling along with the values of their piezoelectric coefficients, with the composite of €TCa/P(VDF-'IYFE) showing enhanced piezoelectric activity over that of FTCa/epoxy. This paper reports on the polarkation properties and the microstructural nature of the composites.

Piezoelectric and dielectric properties of PZT/PVC and graphite doped with PZT/PVC composites

“…1. Williams et al and Nan et al used the air-dried silver paste as an electrode of the composites, and Pardo found electrodes of the silver-paint and vacuum deposited silver without observing differences between them [6][7][8]. For piezoelectric activation, the samples were poled along the thickness direction in a silicon oil bath under a poling filed of 0.1-20 kV/mm dc field as could as before breakdown at 100 • C for 30 min (The PZT/PVC composites could be poled at about 15 kV/mm, and it was poled at nearly 20 kV/mm in 0.3PZT/0.7PVC composite in our experiment.…”

Piezoelectric properties of polyamide 11/NaNbO3 nanowire composites

“…In some particular cases, it is required to preserve the mechanical and easy moulding properties of polymers and the thermal stability of piezoelectric ceramics [13][14][15]. Many works have reported the elaboration and characterization of polymers/inorganic piezoelectric particle composites [16][17][18][19][20][21][22]. The particles studied are synthesized from toxic and nonenvironmentally friendly precursors (for example PZT) and/or their thermal stability is poor (e.g.…”

Interpenetrating Composites

“…Wenger et al investigated the potential of such composites with 0-3 and 1-3 connec-tivity [14][15][16][17]. Wenger et al investigated the potential of such composites with 0-3 and 1-3 connec-tivity [14][15][16][17].…”