Effect Of Injection Molding Temperature And Powder Loading On SS 316L-CNT Green Compact

Abstract

This research delves into the examination of how temperature fluctuations and powder loading levels influence the Metal Injection Moulding (MIM) green component. The feedstock employed in this study combines stainless steel (SS316L-CNT) powders with a composite binder system comprising High Density Poly Ethylene (HDPE), Paraffin Wax (PW), and Stearic Acid (SA). This combination of powders results in a dual-peaked particle size distribution, featuring fine and coarse SS316L-CNT powders with weight proportions of 32% and 68% respectively. These powders are combined at a powder loading of 66% and 67% by volume. The manufacturing process employs the Battenfeld BA 250 CDC injection-moulding machine to craft a MIMA tensile specimen. For determining the density of the as-moulded part, the Archimedes water immersion method, following MPIF Standard 42, is employed. During the experimental process, the injection temperature is modified within the range of 110 to 140°C, while maintaining a consistent injection pressure of 360 bars. To assess green strength, a three-point bending test is performed using the INSTRON 5567 machine, adhering to the MPIF Standard 15 guidelines. The conclusions drawn from the study highlight the heightened sensitivity of the bi-modal feedstock, particularly with increased powder loading, to temperature fluctuations. Furthermore, the study underscores that the influence of injection temperature on the resultant strength and density of the as-moulded part is relatively subdued..