Method for making piezoelectric composites
First Claim
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1. A process for making a piezoelectric composite, comprising the following steps:
- a) forming a stack of a plurality of polarizable sheets using spacers to provide said sheets in a spaced relationship and to provide unfilled spaces between said sheets;
b) filling the spaces separating said sheets with a filler material, said filler material having an acoustic impedance which is substantially different from the acoustic impedance of the material of said sheets;
c) cutting said composite in a direction transverse to said sheets to provide parallel slots and to the extent to leave an uncut portion of said composite to form a supporting base for the thereby formed parallel composite structures;
d) filling said slots with either said filler material or another material having an acoustic impedance which is substantially different from the acoustic impedance of both said filler material and said sheets; and
e) removing said supporting base to provide a composite.
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Abstract
A process for forming piezoelectric composites allows for novel composite designs, including composites with different polarizable material regions and composites with a gradient in volume fraction of polarizable material. Composites with fine-scale microstructures may be formed. The new forming method is an improvement to the traditional "dice and fill" technique currently being utilized to form piezoelectric composites.
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Citations
12 Claims
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1. A process for making a piezoelectric composite, comprising the following steps:
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a) forming a stack of a plurality of polarizable sheets using spacers to provide said sheets in a spaced relationship and to provide unfilled spaces between said sheets; b) filling the spaces separating said sheets with a filler material, said filler material having an acoustic impedance which is substantially different from the acoustic impedance of the material of said sheets; c) cutting said composite in a direction transverse to said sheets to provide parallel slots and to the extent to leave an uncut portion of said composite to form a supporting base for the thereby formed parallel composite structures; d) filling said slots with either said filler material or another material having an acoustic impedance which is substantially different from the acoustic impedance of both said filler material and said sheets; and e) removing said supporting base to provide a composite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification