Abstract
Production of polymer waste powders by Selective Laser Sintering (SLS), an Additive Manufacturing (AM) process, is an impediment to its sustainable growth. The purpose of this study is to find proper utilization of these waste powders by developing filaments from these powders for Fused Deposition Modeling (FDM) process. In order to develop filament materials, polyamide powders PA 12 (Nylon material) are mixed with various weight percentages (12.5, 25, 37.5 and 50) of tungsten carbide to enhance mechanical properties. To determine the suitability of powder mixtures for FDM, Differential Scanning Calorimetry (DSC) and Melt flow index (MFI) tests are performed. A single screw extruder is used to process these powder mixtures to form filaments for testing. It is found that the addition of tungsten carbide has increased glass transition temperature, MFI and the strength of resulting polyamide-tungsten carbide composites. Moreover, filaments possess comparable and better strength than existing filaments, which are used to successfully build 3D parts from an FDM system.
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