PVDF‐PZT‐5H composites prepared by hot press and tape casting techniques

Abstract

Piezoelectric polymer-ceramic composites are promising materials for transducer applications, and they are widely used in underwater hydrophones, biomedical imaging with ultrasound, and nondestructive testing applications. The critical factor in the 0-3 composite is to ensure homogeneous distribution of the filler in the matrix. To ensure this objective, PVDF-PZT composite was prepared by two different routes: hot press and tape casting techniques. Loss on ignition and scanning electron microscopy studies were conducted to find out the uniformity of the composites prepared. It is found that hot press technique gives better uniformity compared to tape casting technique. PZT concentration was varied from 20 to 60 vol %. Physical and dielectric properties were studied. FT-IR, DSC, and XRD characterization studies of PVDF were also recorded. Density of the composites was 2.74 to 5.13 g/cm 3 as PZT concentration increased from 20 to 60 volume fractions. The dielectric constant of composites at 1 MHz varied from 16.74 to 98.48 as PZT concentration increased from 20 to 60 volume fractions. Hot press technique that combines solution and melt processing was found to be the better method for the preparation of 0-3 composites.

Effect of nano- and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

“…It is known in the literature that the composites prepared through the hot-pressing technique give the maximum possible density [17,[37][38][39][40]. From the above equation, the composites with PVDF-KNN nanocrystals show the maximum relative density of 97% at lower volume fraction (10 vol%), whereas when the KNN nanocrystal content is increased from 10 to 20 vol%, the density decreases to 94% and remains almost constant above 20 vol%.…”

“…Several methods such as hot-pressing, compression molding, solvent casting, and tape casting (to fabricate in the form of thin sheets) besides the process associated with pellet shaped specimens were reported in the literature to fabricate several forms of polymer-based composites [17,18,[34][35][36][37][38][39][40]. Among them 0-3 composites are found to be easy to process and could be produced in large scale which consist of polymers and randomly distributed ceramic particles [5,37].…”

The effect of calcining temperature on the properties of 0-3 piezoelectric composites of PZT and a liquid crystalline thermosetting polymer

“…The use of piezoelectric 0-3 composites for sensor applications has been extensively researched for a number of different polymer systems [3][4][5][6][7][8][9][10][11][12]. For this type of composite, mainly the thermoplastic ferroelectric polymer, poly-vinylidenefluoride (PVDF) [3][4][5][6][7][8][9][10] and thermosetting epoxy based resins [11,12] were used.…”

“…For this type of composite, mainly the thermoplastic ferroelectric polymer, poly-vinylidenefluoride (PVDF) [3][4][5][6][7][8][9][10] and thermosetting epoxy based resins [11,12] were used. In many of these studies, the PZT powder was a commercial PZT powder.…”

An effective approach on physical and dielectric properties of PZT-PVDF composites

“…PVDF) and ceramics (e.g. PZT) have been widely utilized in underwater hydrophones, biomedical imaging with ultrasound and non-destructive testing applications [16]. Piezoelectric materials are versatile materials for the applications such as energy harvesting and sensing by applying a mechanical force to the material which produces a charge and voltage across the material (i.e.…”