Table of Contents
Smart Materials Research
Volume 2012, Article ID 821847, 4 pages
http://dx.doi.org/10.1155/2012/821847
Research Article

Fabrication of Simple and Ring-Type Piezo Actuators and Their Characterization

Materials Science Division, National Aerospace Laboratories, Council of Scientific and Industrial Research, Bangalore 560017, India

Received 22 November 2011; Accepted 3 January 2012

Academic Editor: Tao Li

Copyright © 2012 B. Sahoo and P. K. Panda. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A piezo multilayered stack of height 10 mm is fabricated using 80 μm thick PZT tapes prepared by tape-casting technique. About 120 layers of thin tapes are dried, screen-printed with Pt-electrode paste, stacked, laminated, and then isopressed to obtain a green multilayered stack. Cofiring of the stack is carried out at 1 2 5 0 C for 1 h with very slow heating rate ( 1 5 per 1 h). The sintered stack is poled at 2 kV per mm in hot ( 1 2 0 C) silicone oil bath for 45 minutes, and free displacement and block force were characterized. The actuator generates free displacement of 10 μm (0.1% strain) and block force of 1427 N at 175 V. In a similar way, a ring-shaped multilayered PZT stack was fabricated; the displacement was measured to be 8 μm. The ring-type actuator is mainly used for fluid flow control in space vehicles.