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Tailored Multilayer Stack Actuators for Harsh Environment

Behr, Christian and Lippmann, Fabian and Wierach, Peter and Sinapius, Michael (2015) Tailored Multilayer Stack Actuators for Harsh Environment. ECCOMAS SMART 2015, 03.-05. Jun. 2015, Ponta Delgada, S. Miguel Island, Azores, Portugal.

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Abstract

This paper presents the development process of an electrically insulating and liquid-impermeable coating for piezoelectric actuators. Against the background of flow investigations of an adaptive airfoil in a water tunnel the adaptive lip including PZTceramics for the active lip deformation must be insulated and sealed up against the ingress of moisture. Due to high electric field strength of 2 kV/mm between electrodes of multilayer actuators any ingress of moisture would lead to a reduction of the dielectric strength and may cause a short circuit. In order to prevent failure of the adaptive lip the electrical connections of the actuators have to be insulated by a waterproof coating. A service life of at least 10^7 load cycles at a frequency of 100 Hz is required for the actuators. Therefore the coating should be as ductile as possible otherwise it could crack and water could diffuse into the actuators. That is why the yield strength of the coating has to be higher than of the actuators, which is 0.3 %. For the investigation of the waterproofness several samples are coated with different materials in various processes. First the actuators are moulded in epoxy resin and then a diffusion-resistant PVF-foil is applied. After a screening of different materials, an additional coating with a two-component tar-epoxy resin in combination with a gold coating applied by a PVD process seems to be the most suitable process. Another promising waterproof coating is the atomic layer deposition (ALD). It is a slightly changed chemical vapor deposition (CVD) and referring to the studies of A. I. Abdulagatov et al. an ALD of aluminum oxide (Al2O3) and titanium dioxide (TiO2) can slow down the corrosion of static copper specimens in water for ~80 days. Through a redrying procedure during test intermissions an increased underwater service life of the piezoelectric actuators is achieved.

Item URL in elib:https://elib.dlr.de/98885/
Document Type:Conference or Workshop Item (Speech)
Title:Tailored Multilayer Stack Actuators for Harsh Environment
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Behr, Christianc.behr (at) dlr.deUNSPECIFIED
Lippmann, Fabianf.lippmann (at) tu-braunschweig.deUNSPECIFIED
Wierach, Peterpeter.wierach (at) dlr.deUNSPECIFIED
Sinapius, Michaelmichael.sinapius (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:waterproof coating, electrical insulation, smart Materials, piezoelectric actuators, adaptive structures
Event Title:ECCOMAS SMART 2015
Event Location:Ponta Delgada, S. Miguel Island, Azores, Portugal
Event Type:international Conference
Event Dates:03.-05. Jun. 2015
Organizer:ECCOMAS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Behr, Christian
Deposited On:09 Nov 2015 08:10
Last Modified:09 Nov 2015 08:10

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