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Bonding and aging mechanisms of polymers on titanium alloys

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

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Abstract

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.

Item URL in elib:https://elib.dlr.de/129713/
Document Type:Conference or Workshop Item (Speech)
Title:Bonding and aging mechanisms of polymers on titanium alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Löbbecke, MiriamMiriam.Loebbecke (at) dlr.dehttps://orcid.org/0000-0001-7838-6204
Haubrich, JanJan.Haubrich (at) dlr.deUNSPECIFIED
Date:3 September 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:adhesive bonding, surface pretreatment, surface structure, long-term stability, aging mechanisms
Event Title:EUROMAT 2019
Event Location:Stockholm, Schweden
Event Type:international Conference
Event Dates:01.-05. Sep. 2019
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: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Löbbecke, Miriam
Deposited On:06 Nov 2019 16:11
Last Modified:06 Nov 2019 16:11

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