LEE- Polimer Bilim ve Teknolojisi-Doktora
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Yazar "Serhatlı, İ. Ersin" ile LEE- Polimer Bilim ve Teknolojisi-Doktora'a göz atma
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ÖgeManufacturing and characterization of polymer composites by using selective laser sintering 3D printing method(Lisansüstü Eğitim Enstitüsü, 2021) Özbay, Burçin ; Serhatlı, İ. Ersin ; 709840 ; Polimer Bilim ve TeknolojisiFrom the early invention of Additive Manufacturing (AM) from the 1960s to the 1990s, it has been rapidly developing worldwide within the last fifteen years. Studying this fast-growing technology has great importance for many application areas. Additionally, Selective Laser Sintering (SLS) is one of the improved methods of additive manufacturing and is crucial to develop thermoplastics and their composites. The thermoplastic material and thermoplastic matrix composite materials produced by this method have great potential to be used in the automotive and biomedical industries, aerospace and electric electronic sectors, and many others. In this area, hollow featured additives can be used to achieve lightweighted polymer composite structures. The density reduction is significant in enhancing fuel efficiency and reducing CO2 emissions in the aerospace and automotive industries. In the first part of the study, a Hollow Glass Microspheres (HGM) additive amount (10 wt. %, 15 wt. %, 20 wt. %) effects on Polyamide 12 (PA 12) polymer composite sintered parts as a means of the final density and mechanical properties of the composite structures were investigated. As the result of the study, the optimum HGM addition amount was detected as 20 wt. %. After that the second part of the study has been started with the detected optimum amount of HGM addition to PA 12. The study aims to determine the effects of different types and the same amount of hollow featured additives on polyamide polymeric structures, which have been produced by SLS-AM technology. This part of the research covers the comparison of the same amount, and different types of Hollow Glass Microspheres (HGMs) filled Polyamide 12 (PA 12) polymer composites. In the third part of the study, the metal additive effects on PA 12 polymer matrix were investigated. The electrical, thermal and mechanical effects of copper fillers on the PA 12 polymer matrix were examined. Two various types of Cu particles (spherical and dendritic) were introduced to the PA 12 polymer matrix in the same proportion (15 wt. %) as fillers. The thermal stability and thermal behaviors, crystallization kinetics, and heat capacities of copper-filled mixes and unfilled PA 12 were also analyzed. And the electrical conductivity of unfilled PA 12 and produced Cu-filled polymer composites were analyzed. In the last part of the research, the flame retardancy properties of polymer composites that were produced by SLS, were investigated. Different types and the same amount of fire retardant additives were added to PA 12 polymer matrix. And unfilled PA 12 and produced polymer composites were analyzed in terms of mechanical characteristics and flame retardancy features. For the SLS-AM processing EOS P 110 (EOS GmbH) SLS production machine with 100 microns of layer height was used in the study. To prepare polymer composite powder mixtures, a rotary tumbler was used. For powder and sintered samples, material characterization tests were performed. All mechanical tests (tensile, 3 point bending, notched Charpy impact tests, and DMA) were performed according to the related ISO standards. On the other hand, the sintering window area detections were obtained by DSC graphs. They were used to determine optimum laser sintering process parameters, which are laser power, scan speed, and scan spacing.