Piezoelectric Multilayer Ceramic/Polymer Composite Transducer with 2–2 Connectivity |
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Authors: | Chang-Bun Yoon Seung-Ho Lee Sung-Mi Lee Young-Hag Koh Hyoun-Ee Kim Kyung-Woo Lee |
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Affiliation: | School of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea; Kyungwon Ferrite Ind. Co. Ltd., 1260-4 Chungwang-dong, Shiheung-si, Kyonggi-do 429-450, Korea |
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Abstract: | A multilayer piezoelectric ceramic/polymer composite with 2–2 connectivity was fabricated by thermoplastic green machining after co-extrusion. The multilayer ceramic body was composed of piezoelectrically active lead zirconate titanate (PZN)–lead zinc niobate (PZN)-lead zirconate titanate (PZT) layers and electrically conducting PZN–PZT/Ag layers. After co-extruding the thermoplastic body, which consisted of five piezoelectric layers interspersed with four conducting layers, it was computer numeric-controlled machined to create periodic channels within it. Following binder burnout and sintering, an 18 vol% array of 190 μm thin PZT slabs with a channel size of 880 μm was fabricated. The channels were filled with epoxy in order to fabricate a PZN–PZT/epoxy composite with 2–2 connectivity. The piezoelectric coefficient (effective d 33) and hydrostatic figure of merit ( d h× g h) of the PZN–PZT/epoxy composite were 1200 pC/N and 20 130 × 10?15 m2/N, respectively. These excellent piezoelectric characteristics as well as the relatively simple fabrication procedure will contribute in widening the application range of the piezoelectric transducers. |
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