Selective Laser Sintering (SLS) is close to be accepted as a genuine production technique (Additive Manufacturing). However, one problem restricting a more frequent specific use of SLS-parts is the limited or unknown long-term or functional behaviour under particular environmental conditions. In our specific case, for automotive applications, plastic materials can get in contact with brake fluid and coolant. The behaviour of commercial SLS materials in contact with these liquids must be qualified in advance for a successful implementation. The presented work launches for the first time a systematic investigation of changes of SLS parts made from Duraform DF and Duraform HST in contact with car media (coolant and brake fluid). Moreover, the influence of certain sealing chemicals was evaluated as well. Overall, it can be specified that coatings on epoxy-, silicon- and PVC-basis could be successfully applied by means of dip coating. Coatings layer thicknesses between (10 µm and 70 µm) were obtained. It turned out that epoxy coatings are inadequate. A massive weight increase and delamination can be observed. Overall, silicon coatings illustrates a positive sealing effect regarding gravimetry but the adhesion to the Duraform substrates is somehow insufficient and must be improved in case of further implementation for existent car applications. PVC coatings have a marginally positive sealing effect regarding coolant. Possible improvement with increased layer thicknesses and substrate anchorage can be predicted. The overall mechanical properties investigations provide no clear indication regarding practicality of the different applied coatings. However, it is clearly recognized that coolant weakens the mechanical properties of Duraform HST substantially.
Long-term durability of SLS polymer components under automotive application environment
2012
8 Seiten, 7 Bilder, 1 Tabelle, 11 Quellen
Conference paper
English
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