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Processing of Semi-Crystalline Thermoplastics by Selective Mask Sintering

Selective mask sintering (SMS) of polymers is a young additive manufacturing technique. It is a powder and beam based process, which allows production of complex polymer parts layer-by-layer without any tools and molds. In contrast to common selective laser sintering (SLS), layers are not molten by scanning certain areas with a laser spot, but two-dimensionally by broad band infrared radiation. Hereby, layer building time is independent of exposed surface geometry.

Due to unknown fundamental issues of this additive processing technique, such as process relevant material properties, energy applications into powder bed, as well as their interactions with resulting part properties are investigated in the following work. In addition to commercially available PA12-powders material modifications with different rates of absorbers as well as different fillers are used. Based on a comprehensive powder material characterization processing experiments with varying process parameters are done. As a result, interrelationships between all the parameters are derived. In addition to the simulation of the thermal heat management of the mask sintering machine, mechanical properties of produced parts as a function of part orientation as well as the cross-section surface and cross-section geometry are investigated. Finally, processing behavior of filled materials to create functionalized SMS-parts (heat conductivity) is analyzed and realized.

Based on a first established process model of selective mask sintering important process principals are derived to permit a further process development as well as further examinations on powder and beam based additive manufacturing techniques.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Florian Kühnlein

Florian Kühnlein
Lehrstuhl für Kunststofftechnik (LKT)
Universität Erlangen-Nürnberg

Information

Free keywords: Additive Manufacturing, Rapid Prototyping, Selective Mask Sintering
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dietmar Drummer (Betreuer), Prof. Dr.-Ing. Gerd Witt, Prof. em. Dr.-Ing. Dr. h. c. Gottfried W. Ehrenstein
Publication year: 2013
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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