A type of piezoelectric composite has been developed for oceanographic applications. The composites have a large figure of merit (dh*gh or dh*gh/tan delta , where dh is the hydrostatic piezoelectric voltage coefficient), a large dielectric constant (K) and low dielectric loss, and great mechanical strength. A shallow cavity between the PZT ceramics and thick metallic electrode is designed to convert a portion of the z-direction stress into a large radial and tangential stress of opposite sign. thereby causing the d33 and d31 contributions to dh to add rather than subtract, and raising the figure of merit. Theoretical stress analysis was carried out using an axisymmetric finite element method. Experimental results show that the dh*gh, K, and withstandable pressure are extremely high.
Piezoelectric composites with high sensitivity and high capacitance for use at high pressures
Piezoelektrische Verbundwerkstoffe mit hoher Empfindlichkeit und großer Kapazität für hohe Drücke
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control ; 38 , 6 ; 634-639
1991
6 Seiten, 10 Quellen
Article (Journal)
English
MESSING , KERAMIK , VERBUNDWERKSTOFF , DIELEKTRISCHER VERLUSTFAKTOR , METHODE DER FINITEN ELEMENTE , BLEIVERBINDUNG , DIELEKTRIZITAETSZAHL , PIEZOELEKTRISCHER STOFF , PIEZOELEKTRISCHER WANDLER , DRUCKMESSUNG , BLEI , ZIRKONIUM , TITANATE , HYDROPHON , MEERESTECHNIK , HOCHDRUCK (MECHANIK) , SPANNUNGSANALYSE
High performance piezoelectric composites
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