pps proceeding - Abstract Preview
pps proceeding
Symposium: S03 - Processing Methodologies
Oral Presentation
 
 

Processing and Characterization of Polymer-Metal-Hybrids

Kuehnert Ines (1)*, Gedan-Smolka Michaela (1), Fischer Matthieu (1), Scholz Peter (2), Landgrebe Dirk (2), Garray Didier (3)

(1) Leibniz-Institut für Polymerforschung Dresden e.V. - Dresden - Germany, (2) Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik - Chemnitz - Germany, (3) The Collective Center for the Belgian technology industry - Seraing - Belgium

The hybridization of components is a promising and effective way to enable lightweight structures which fulfil different requirements using customized material selection for each specific application. The combination of plastics and light metals allows the integration of functions, utilizes the shaping possibility and low density of plastics and the high stiffness of metals. In this study, the shaping and assembly behavior of purely adhesive polymer-metal-composites was investigated using a two step curable uretdione-polyester-based powder coating (developed at IPF) which acts simultaneously as a reactive adhesive agent and as a high-quality surface finish. To create the composite, a thermoplastic polyurethane (TPU) layer with good compatibility to the powder coating was over-molded onto a powder coated aluminum substrate. A polyamide (PA6) layer was over-molded on top of the TPU layer to create a stiff composite structure with possibilities for further functionalization. The TPU-layer in between the metal substrate and the polymer top layer acts as a stress and strain compensation layer. These loads are caused by thermal expansion (under fluctuating temperatures) and external forces/deformation. Another key feature of the composite is the innovative process chain. The powder coating can resist high deformation and therefore the coating is suitable for a future application onto metal substrates using a coil coating procedure. In addition, the coil could be easily implemented into a production line as a semi-finished product. The prefinished coated metal substrate could be formed (e.g. incremental forming, deep drawing) and inserted in the over-molding procedure. This overall shortened process chain allows not only an effective fabrication of pre-coated semi-finished materials and polymer-metal-joints in high quantities by eliminating process steps (e.g. cleaning steps, glue application) but also a higher versatility in the subsequent composite production.