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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 27 2:20 PM
Pre- & Post-Treatment
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| Title: |
Influence of the surface structure on the adhesion strength of ZnAl2 coatings on thermal instable polymers printed by means fused layer modeling (FLM)
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| Authors: |
Christopher Schaak* / University of Dortmund, Germany
Wolfgang Tillmann / Institute of Materials Engineering, TU Dortmund, Germany
Kevin Bleicher/ Institute of Materials Engineering, TU Dortmund, Germany
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| Abstract: |
Additive manufacturing (AM) techniques open access to completely new manufacturing possibilities. AM techniques using metals, ceramics, or plastics feedstock are predestinated for lightweight construction and for components with complex shapes or with internal functions. AM processing with plastics stands out due to the low density of polymers, a good process capability, and low initial costs. The properties of polymer components are extremely dependent on the utilized plastics and on the reinforcements, e.g. in the form of fibers. Furthermore, coatings can improve the properties and enlarge the possible range of applications for plastics. In the present study, PLA (polylactic acid) was printed utilizing Fused Layer Modeling (FLM). The surfaces of the PLA samples were directly structured during printing with gaps with different widths. Subsequently, the surfaces were coated with ZnAl2 by means of Twin Wire Arc Spraying (TWAS). Adhesion tests meeting DIN EN 582 were conducted to measure the adhesion of the coating on the structured plastic surface. The results were compared to the adhesion of ZnAl2 coatings on grit blasted and as-built surfaces. Overall, the surface adhesion was significantly better for the samples with directly structured surfaces. Hence, a direct structuring of the surface during a 3D building process promises to be an outstanding possibility to prepare surfaces prior to a coating process.
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