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Diffusion-Resistant Coating for Harsh Environment Application of Piezoelectric Actuators

Behr, Christian und Wierach, Peter und Sinapius, Michael (2018) Diffusion-Resistant Coating for Harsh Environment Application of Piezoelectric Actuators. In: ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2018. ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS), 2018-09-10 - 2018-09-13, San Antonio, USA. doi: 10.1115/SMASIS2018-8234.

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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/124305/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Diffusion-Resistant Coating for Harsh Environment Application of Piezoelectric Actuators
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Behr, Christianc.behr (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wierach, PeterPeter.Wierach (at) dlr.dehttps://orcid.org/0000-0003-0852-9112144593705
Sinapius, MichaelMichael.Sinapius (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2018
Erschienen in:ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2018
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.1115/SMASIS2018-8234
Status:veröffentlicht
Stichwörter:piezoelectric, actuator, PZT, coating, water resistant, waterproof, harsh environment
Veranstaltungstitel:ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS)
Veranstaltungsort:San Antonio, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:10 September 2018
Veranstaltungsende:13 September 2018
Veranstalter :American Society of Mechanical Engineers (ASME)
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Strukturen und Werkstoffe (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik
Hinterlegt von: Behr, Christian
Hinterlegt am:10 Dez 2018 08:42
Letzte Änderung:24 Apr 2024 20:28

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