Using morphological changes to make piezoelectric transducers

Details Using morphological changes to make piezoelectric transducers Using morphological changes to make piezoelectric transducers

1998-06-08

2000-01-11

Talbot, Brian K.

Coating processes

Electrical product produced

Piezoelectric properties

29 2535, B05D 512

Patent

active

060133112

ABSTRACT:
A method of forming a piezoelectric element which includes piezoelectric material having a variable functionally gradient d-coefficient including coating a block having a uniform concentration of piezoelectric material with a predetermined porosity by applying a first layer having piezoelectric material with a same or different chemical composition than the block onto a surface of the block and having a different porosity than the predetermined porosity which is selected so as to provide a different morphological structure than the block; applying a subsequent layer of piezoelectric material on the first layer with the same or different chemical composition of piezoelectric material than the block and having a different porosity than the previously deposited layer so as to provide a different morphological structure than the block or the previously applied layer(s); applying heat to the block and the applied layer to dry the applied layer; and then applying heat to sinter the piezoelectric block and applied layer so as to form a piezoelectric element with a functionally gradient d-coefficient.

REFERENCES:
patent: 5233256 (1993-08-01), Hayashi et al.
patent: 5302935 (1994-04-01), Chatterjee et al.

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