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Diffusion-Resistant Coating for Harsh Environment Application of Piezoelectric Actuators

Behr, Christian and Wierach, Peter and Sinapius, Michael (2018) Diffusion-Resistant Coating for Harsh Environment Application of Piezoelectric Actuators. ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS), 10.-13. Sep. 2018, San Antonio, USA.

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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 PZT-ceramics 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 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/124305/
Document Type:Conference or Workshop Item (Speech)
Title:Diffusion-Resistant Coating for Harsh Environment Application of Piezoelectric Actuators
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Behr, Christianc.behr (at) dlr.deUNSPECIFIED
Wierach, PeterPeter.Wierach (at) dlr.deUNSPECIFIED
Sinapius, MichaelMichael.Sinapius (at) dlr.deUNSPECIFIED
Date:2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:piezoelectric, actuator, PZT, coating, water resistant, waterproof, harsh environment
Event Title:ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS)
Event Location:San Antonio, USA
Event Type:international Conference
Event Dates:10.-13. Sep. 2018
Organizer:American Society of Mechanical Engineers (ASME)
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
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems
Deposited By: Behr, Christian
Deposited On:10 Dec 2018 08:42
Last Modified:10 Dec 2018 08:42

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