Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-12-21
1986-09-23
Bell, James J.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
252 629, 428113, 428221, 428413, 428417, 4284231, H01L 4108
Patent
active
046137840
ABSTRACT:
Piezoelectric PZT-polymer composites of 1-3 and 1-3-0 connectivity are trversely reinforced with glass fibers to increase the hydrostatic piezoelectric charge and voltage coefficients (d.sub.h and g.sub.h) 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 g.sub.h. By increasing the d.sub.h and g.sub.h coefficients, the d.sub.h g.sub.h product, used as the figure of merit, is greatly enhanced.
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patent: 4268560 (1981-05-01), Maistre
patent: 4390583 (1983-06-01), Brazel
patent: 4412148 (1983-10-01), Klicker et al.
patent: 4422003 (1983-12-01), Safari et al.
patent: 4448832 (1984-05-01), Kidwell
patent: 4513043 (1985-04-01), Smades
Haun Michael J.
Newnham Robert E.
Schulze Walter A.
Beers Robert F.
Bell James J.
Lall Prithvi C.
McGill Arthur A.
The United States of America as represented by the Secretary of
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