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Bonding and aging mechanisms of polymers on titanium alloys

Löbbecke, Miriam und Haubrich, Jan (2019) Bonding and aging mechanisms of polymers on titanium alloys. EUROMAT 2019, 2019-09-01 - 2019-09-05, Stockholm, Schweden.

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Kurzfassung

Adhesive bonding is a key technology for structural joining as well as for modern lightweight multimaterials (e.g. fiber-metal laminates) in aerospace or automobile applications. It allows joining different materials with more homogenous load pathways compared to mechanical joining. However, it is quite demanding since service conditions often include both mechanical and environmental/chemical loads, for example humidity, salt-water or deicing-agents. Achieving high-performance joints with sufficient degradation resistance depends strongly on the surface pretreatment, especially for thermoplastics like PEEK (poly-ether ether ketone). The goals of the current investigations are two-fold: (i) To study the bonding of selected thermoplastic and thermoset polymers to titanium alloys and the aging mechanisms, and (ii) to develop surface pretreatments suitable for specific aerospace material combinations. Specimens have been investigated with various microanalytical, surface and mechanical characterization methods. Nd:YAG laser treatments as well as anodization allow for long-term stable joints between PEEK or epoxies like RTM6 and CP-Ti, different Ti-Al-V alloys or Ti-15V-3Al-3Sn-3Cr. Results show that the presence of a nanostructure with suitable morphology and chemistry on the metal surfaces is crucial for slowing degradation. Special experiments have been designed to separately modify surface structures at different length scales or the surface chemistry in order to elucidate the dominating bonding mechanisms. Chemical interactions are most important in the initial stage of the bonding for wetting and infiltration of the surface structures. For polymers largely "inert" against water, they account for the observed aging effects until only (nano-mechanical interlocking remains. Suitable processing windows for laser pretreatment of different titanium alloys have been identified and the understanding of prevailing bonding and aging mechanisms been advanced.

elib-URL des Eintrags:https://elib.dlr.de/129713/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Bonding and aging mechanisms of polymers on titanium alloys
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Löbbecke, MiriamMiriam.Loebbecke (at) dlr.dehttps://orcid.org/0000-0001-7838-6204NICHT SPEZIFIZIERT
Haubrich, JanJan.Haubrich (at) dlr.dehttps://orcid.org/0000-0002-5748-2755NICHT SPEZIFIZIERT
Datum:3 September 2019
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:adhesive bonding, surface pretreatment, surface structure, long-term stability, aging mechanisms
Veranstaltungstitel:EUROMAT 2019
Veranstaltungsort:Stockholm, Schweden
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:1 September 2019
Veranstaltungsende:5 September 2019
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: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Experimentelle und numerische Methoden
Institut für Werkstoff-Forschung > Metallische Strukturen und hybride Werkstoffsysteme
Hinterlegt von: Löbbecke, Miriam
Hinterlegt am:06 Nov 2019 16:11
Letzte Änderung:24 Apr 2024 20:33

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