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Preparation of Polymeric and Polymer Coated Metallic Particles for Application in SLS Process

Agha Babaei Bani, Hamed | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54978 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramezani Sadatabadi, Ahmad
  7. Abstract:
  8. Today, incremental manufacturing processes are rapidly evolving and expanding. These processes are used for the rapid fabrication of prototypes as well as the fabrication of parts with high geometric complexity and high dimensional accuracy. These processes are used in various fields such as manufacturing industrial parts, medicine, precision casting, etc. One of the most important incremental manufacturing processes that has received much attention today is the selective laser processing process. One of the problems of this process is the limitation in the use of different polymers for processing. Polyamide 12 currently has about 90% market share due to its high processability. However, this polymer has limited use due to its high production cost. The purpose of this research is to expand the processable materials in the selected laser processing process and improve the efficiency of the parts processed by this process. To achieve the goals, emulsion polymerization was used to synthesize malleable styrene maleic anhydride polymer in the selective laser processing process. The purpose of synthesizing this polymer is to improve processability and higher dimensional accuracy than polystyrene polymer used in precision casting. The synthesized samples were characterized using Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and dynamic light scattering (DLS), indicating morphology. Spherical, particle size and amorphous polymer structure. The results of mechanical tensile test showed that the mechanical properties of the synthesized polymer are improved compared to polystyrene. Finally, the performance parameters specific to the fabricated powder such as powder bed temperature, powder surface temperature and laser scanning speed are the results of differential calorimetric test (DSC). Thermal calorimetric analysis (TGA) as well as experimental work was performed with a selective laser processing device and a piece was made to investigate the mechanical properties
  9. Keywords:
  10. Selective Laser Sintering (SLS)Method ; Investment Casting ; Additive Manufacturing ; Polymer Particles ; Styrene Maleic Anhydride Copolymer

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