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Metal–Ceramic Composite Actuators
Author(s) -
Sugawara Yutaka,
Onitsuka Katsuhiko,
Yoshikawa Shoko,
Xu Qichang,
Newnham Robert E.,
Uchino Kenji
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04172.x
Subject(s) - materials science , ceramic , piezoelectricity , composite material , lead zirconate titanate , brass , actuator , composite number , transducer , electrostriction , displacement (psychology) , pressing , acoustics , metallurgy , copper , dielectric , optoelectronics , ferroelectricity , electrical engineering , psychology , physics , psychotherapist , engineering
A new type of actuator composed of metal (brass) end caps and piezoelectric ceramics has been developed as a displacement transducer. Shallow cavities positioned between the metal caps and the central ceramic disk convert and amplify the radial displacement of the piezoelectric ceramic into a large axial motion of the metal end caps. Large d 33 coefficients exceeding 2500 pC/N are obtained with the composite actuators. The behavior of the electrically induced strain with geometric variables, such as the thickness of the metal end caps, and with pressing force and driving frequency has been evaluated. Sizeable strains are obtained with both PZT (piezoelectric lead zirconate titanate) and PMN (electrostrictive lead magnesium niobate) ceramics.