Mr. Marek Schmidt Profile

Marek Schmidt

at Technische Univ Chemnitz

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Proceedings Article | 27 March 2015 Paper

Influence of surface processing on the fracture strength of structurally integrated PZT fibers in shaped sheet metal parts

Marek Schmidt, Volker Wittstock, Michael Müller

Proceedings Volume 9435, 943535 (2015) https://doi.org/10.1117/12.2084218

KEYWORDS: Surface finishing, Polishing, Metals, Ceramics, Ferroelectric materials, Composites, Aluminum, Adhesives, Chemical mechanical planarization, Sensors

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In the present state of the art, the function integration into lightweight metal structures is generally based upon adhesive bonding of sensors or actuators to the surface. A new technology enables a direct structural integration of lead-zirconatetitanate (PZT) fibers into local microstructures of metal sheets and subsequent joining by forming. This provides a complete functional integration of the piezoelectric ceramic in the metal for sensors and actuators purposes. In a further process step, the composite is shaped by deep drawing with a cup with double curvature radii of 100 mm into a complex 3D surface. During the shaping process it is expected that the PZT- fibers get damaged with the result of degradation of the piezoelectric function. This paper describes the application of various surface processing methods to improve the shaping behavior of the piezoceramic fibers.

The production of interconnected parallel fibers is based on piezoceramic plates. The plates are treated by different surface processing. One experimental series is lapped and another series is extra polished by chemical mechanical polishing (CMP). The resulting plates were examined with regard to the fracture strength and the degradation of the piezoelectric properties during manufacturing and operation. It has been shown that the lapped and polished plates have a clearly better persistence with regard to the shaping processes compared to the unprocessed plates. The best results in this process were achieved by the polished plates, which is also transferable to the fibers. Furthermore, the piezoelectric characteristics were better preserved by the lapped and polished plates and fibers.

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