Electrode for piezoelectric composites

Details Electrode for piezoelectric composites Electrode for piezoelectric composites

1988-06-30

1990-02-13

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310800, H01L 4108

Patent

active

049009729

ABSTRACT:
The invention provides an electrode for piezoelectric composites having high acoustic attenuation. The electrode is composed of a first layer having high elasticity and lower conductivity and of a second layer lying thereabove that has higher conductivity. The invention also provides a method for the manufacture thereof. The first layer is an intrinsically conductive plastic directly deposited on the ceramic whose polymerization is initiated by chemical or anodic oxidation of the corresponding monomers. The second layer is fashioned of adequately conductive metal and is preferably first sputtered on or vapor-deposited in a thinner layer and is then subsequently electrolytically reinforced. Piezoelectric composites that exhibit high acoustic attenation and, thus, prevent an acoustic crosstalk between the individual transducer elements can be manufactured from piezoelectric ceramic lamina or foils provided with such electrodes. Such composites also withstand higher mechanical distortion (for example, due to thermal expansion), even if the ceramic is highly porous.

REFERENCES:
patent: 2077204 (1937-04-01), Bechmann
patent: 2648785 (1953-08-01), Tournier
patent: 3803545 (1974-04-01), Van Dyck et al.
patent: 3872332 (1975-03-01), Butter
patent: 3912830 (1975-10-01), Murayama et al.
patent: 4404489 (1983-09-01), Larson, III et al.
patent: 4609845 (1986-09-01), Soni et al.
patent: 4695756 (1987-09-01), Tanaka
patent: 4701659 (1987-10-01), Fujii et al.
patent: 4786837 (1988-11-01), Kalnin et al.

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