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Effect of polymer ceramic fiber interface design on coupling factor of piezoelectric composites with low fiber content

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Document pages: 8 pages

Abstract: In this work, we studied the application of different short molecular polymer coatings in piezoelectric ceramic polymer composites with low fiber volume content. The interface between piezoelectric PZT (lead zirconate titanate) fiber and epoxy resin matrix is modified to improve the electromechanical coupling coefficient of 1-3 ultrasonic transducer with low fiber content. It is well known that the electromechanical coupling coefficient can be increased by precoating soft interlayer polymers on ceramic fibers [1-1-3]. In this paper, we study the so-called 1-1-1-3 composite, which is composed of ferroelectric ceramic fiber (core), soft polymer layer (such as fatty acid, amide, wax or oil), epoxy resin shell and epoxy resin matrix. Some soft polymer layers allow ferroele to move freelytric fibres reducing blocking or clamping by the inactive polymeric matrix, resulting in higher electromechanical coupling factors (kt) for composites with low fibre volume contents. Using an oil-based interlayer, the dielectric constant can be significantly increased. The lowest fibre push-out stress could be achieved with the paraffin interlayer; however, no correlation with the coupling factor could be observed.

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