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Transversely Reinforced Piezoelectric Composites.
DEPARTMENT OF THE NAVY WASHINGTON DC
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Piezoelectric PZT-polymer composites of 1-3 and 1-3-0 connectivity are transversely reinforced with glass fibers to increase the hydrostatic piezoelectric charge and voltage coefficients dh and gh for possible use in hydrophone applications. These composites consisted of a foamed with porosity or non-foamed no porosity polymer matrix with PZT rods aligned parallel to the poling direction and glass fibers in the remaining two transverse directions. Because of the small percentage of PZT required, these composites have densities near that of water, and much lower dielectric constants than solid PZT, resulting in large increases in the hydrostatic piezoelectric voltage coefficient gh. By increasing the dh and gh coefficients, the dhgh product, used as the figure of merit, is greatly enhanced. Patents.
APPROVED FOR PUBLIC RELEASE