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Laser-induced chemical modification and nanostructuring of metal surfaces for optimal adhesive bonding to thermoplastic polymers: the interface between TWIP steel and PEEK

Haubrich, Jan and Kramer, Eugen and Hausmann, Joachim (2014) Laser-induced chemical modification and nanostructuring of metal surfaces for optimal adhesive bonding to thermoplastic polymers: the interface between TWIP steel and PEEK. Euro Hybrid Materials and Structures 2014, 10.-11. April 2014, Stade.

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Abstract

Surface preparation methods play a major role in many technical applications such as paint and anti-corrosion coating or adhesive joining. They are crucial for producing reliable surfaces that allow the formation of adhesive bonds with high initial strengths and high long-term stability in degrading environments. The surface preparation methods depend strongly on the material combination and the operating conditions that the joint will be exposed to. Bonding metals to thermoplastic polymers (e.g. PEEK) is a particular challenge that poses high requirements towards the chemical and structural surface properties. Contrary to chemically consolidating adhesives, thermoplastic polymers are commonly assumed to bond only via mechanical interlocking and weaker physical interactions. Previous studies showed that Nd:YAG-laser-treatments allow the formation of strong Titanium-PEEK-interfaces with high degradation resistance against humidity. The goal of our present research aims at transferring the methodology to steel-PEEK interfaces and developing a fundamental understanding of the underlying processes and problems. The knowledge of the interface’s and the laser-generated oxide film’s properties, the nature of mechanical, physical and chemical bonds formed, and the degradation processes is a prerequisite for systematic furthering of adhesive technologies for new materials and applications. In this study we report the first results obtained on laser-treated surfaces of highly ductile high-strength TWIP-steel and the adhesion properties to PEEK. Fracture-mechanical studies by means of single-lap-shear (SLS) and degradation experiments were performed with regard to the laser process parameters. Electron-microscopy showed the formation of oxide films upon laser irradiation in ambient atmosphere. Further investigation of the SLS fracture surfaces implied the occurrence of different failure mechanisms. Chemically-sensitive scanning electron microscopy allowed the differentiation between “apparent” adhesive failure as detected with a light-microscope and pseudo-adhesive failure in the PEEK-interface region by means of residual PEEK. These, besides large areas of cohesive failure, indicate a strong bonding to the functionalized metal.

Item URL in elib:https://elib.dlr.de/91722/
Document Type:Conference or Workshop Item (Poster)
Title:Laser-induced chemical modification and nanostructuring of metal surfaces for optimal adhesive bonding to thermoplastic polymers: the interface between TWIP steel and PEEK
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haubrich, JanJan.Haubrich (at) dlr.deUNSPECIFIED
Kramer, EugenEugen.Kramer (at) dlr.deUNSPECIFIED
Hausmann, Joachimjoachim.hausmann (at) dlr.deUNSPECIFIED
Date:April 2014
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Adhesion, adherend, surface pre-treatment, pulsed laser, ageing, HSD, TWIP steel, polymer, polyetheretherketone (PEEK)
Event Title:Euro Hybrid Materials and Structures 2014
Event Location:Stade
Event Type:international Conference
Event Dates:10.-11. April 2014
Organizer:DGM
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 > Metallic Structures and Hybrid Material Systems
Deposited By: Haubrich, Jan
Deposited On:11 Nov 2014 14:30
Last Modified:31 Jul 2019 19:48

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