Abstract
This research investigates the features crucial to injection molding via the rheological behavior, injection molding, debinding, and sintering process of water and gas atomised 316L stainless steel powder utilizing a newly developed locally based binder system containing palm stearin. The critical powder loading for injection molding was 65vol% for gas atomisation and 62vol% for water atomisation. Due to the minimal interparticle friction and high packing density, the gas-atomised powder proved easier to shape. In contrast, the water-atomised powder has a high viscosity of the injection molding feedstock, a high interparticle friction, and a low packing density, all of which impede injection molding. The debinding of the binder was accomplished utilizing solvent and thermal methods. After debinding, samples were sintered in a high-temperature vacuum furnace at 1360 degrees Celsius. Results reveal that water-atomised powder can be sintered to 95% of its theoretical density, whereas gas-atomised powder can be sintered to near full density.
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