Innovative fabrication of PZT pillar arrays by a colloidal approach
authors Olhero, SM; Garcia-Gancedo, L; Button, TW; Alves, FJ; Ferreira, JMF
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Suspensions; Shaping; PZT; Sensors; Gel casting
keywords EPOXY-RESIN; GELLING AGENT; ALUMINA; CERAMICS
abstract An innovative approach for fabricating pillar arrays for ultrasonic transducer applications is disclosed. It involves the preparation of concentrated piezoelectric lead zirconate titanate (PZT) suspensions in aqueous solutions of epoxy resin and its polymerization upon adding a polyamine based hardener. Zeta potential and rheological measurements revealed that 1 wt.% dispersant, 20 wt.% of epoxy resin and a hardener/epoxy resin ratio of 0.275 mL g(-1), were the optimized contents to obtain strong PZT samples with high green strength (35.21 +/- 0.39 MPa). Excellent ellipsoidal and semi-circle shaped pillar arrays presenting lateral dimensions lower than 10 mu m and 100 mu m height were successfully achieved. The organics burning off was conducted at 500 degrees C for 2 h at a heating rate of 1 degrees C min(-1). Sintering was then carried out in the same heating cycle at 1200 degrees C for 1 h. The microstructures of the green and sintered ceramics were homogeneous and no large defects could be detected. (C) 2011 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2012
volume 32
issue 5
beginning page 1067
ending page 1075
digital object identifier (doi) 10.1016/j.jeurceramsoc.2011.11.016
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000300203000011
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journal impact factor 4.495
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