Accession Number : ADD012875

Title :   Transversely Reinforced Piezoelectric Composites.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Haun,Michael J ; Newnham,Robert E ; Schulze,Walter A

Report Date : 23 Sep 1986

Pagination or Media Count : 7

Abstract : 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).

Descriptors :   *PIEZOELECTRIC MATERIALS, *MATRIX MATERIALS, COEFFICIENTS, GLASS FIBERS, COEFFICIENTS, HYDROSTATICS, VOLTAGE, PATENTS, POROSITY, TRANSVERSE, WATER, FIGURE OF MERIT, HYDROPHONES, CONSTANTS, DIELECTRIC PROPERTIES, LOW LEVEL, POLYMERS, RODS

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE