Publication: Thermoplastic-metal composite bonding in the field of transport
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Publication date
2011-01
Defense date
2011-10-31
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Abstract
This project deals about the best process to bond different thermoplastic composites with metals. The composites are Carbon/PEEK, Carbon/PPS and Glass/Pa12; and the metals are aluminum and stainless steel. The three different composites should be bonded once with the aluminum and once with the stainless steel. There will be thus six combinations. In big projects it is very useful to plan a project with different tools. During the classes in the beginning of the project it was taught which kind of tools exists and what methods are good to plan a project. The first part of the report hence deals with the planning and project management of this project. It is about the scope of the project; a 'work breakdown structure', where all the tasks are listed; a Gantt chart which includes all different tasks, resources and time planning, and different methods to monitor a project. The next chapter 'state of the art' is about information of composites and metals and about the different surface treatments. Surface treatments are important to enable the adhesive to spread on the surface and to achieve a good stability. In the chapter, 'surface energy', it is explained what exactly it is and how you can measure it with the 'drop test'. Following the different adhesive groups are listed and the adhesion theory explains why bonding is, at all, possible. The next and almost last chapter deals about the description of the whole bonding process. The three steps, a bonding process includes, are the surface treatment, the adhesive application and finally the joint assembling. The first step is therefore to find the best surface treatment by doing drop tests and shear strength test with the same adhesive for all treatments. Abrasion is the best treatment for the metals and flame for the composites. The second step is to select three different adhesives to find out the best adhesives. This was done by bonding one material among themselves and making shear strength test. So the best adhesive for the combinations PEEK-aluminum, PEEK-stainless steel and PPS-aluminum is the 'DP490'. For the PPS-stainless steel combination, it is 'Duralco 4524'. Finally the required shear stress were achieved with 15,40 MPa for PEEK-aluminum, 22,40 MPa for PEEK-stainless steel, 23,24 MPa for PPS-aluminum and 16,01 MPa for PPS-stainless steel.
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Materiales compuestos, Termoplásticos, QuÃmica del estado sólido, Metales