Processability of waste plastic bag as a novel binder system in metal injection molding

Kamarudin, Nur Hafizah (2017) Processability of waste plastic bag as a novel binder system in metal injection molding. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Metal injection molding is the most cost effective processes in powder metallurgy to produce small and intricate part for mass production. Many researchers are mainly focused on the commercial binders, while only few of them are conducting the MIM using recycle binders. Therefore, this work focuses on the characterization of waste plastic bag as a novel binder system with combination of palm kernel (PK) in “Green MIM” of 316L Stainless Steel. Significant with this, this effort was able to reduce MIM cost, reduce disposal problem and thus, create awareness among community that waste product can also be considered as valuable things instead of disposing them. However, this work was not covering the cleaning process of the waste plastic bag (WPB). The feedstock was prepared by three formulation of 50/50 (WPB/PK), 40/60 (WPB/PK), 30/70 (WPB/PK), while keeping 60 vol. % of powder loading. Homogeneity and rheology test prove that the all formulations were qualified to proceed in molding process. The screening test of molding process was conducted via Analysis of variance. It prove that the interaction factor was not significant to the responses. The combination of orthogonal array Taguchi L9 (34) and Grey Taguchi show that the optimal condition for conducting this process was; injection temperature of 180 °C, mold temperature of 50 °C, injection pressure of 40 % and injection speed of 50 %. Whereby, extraction in heptane solution (solvent to feed ratio of 12:1) at 70 °C within 7 hours was recognized as the optimal condition for solvent debinding. Else, a thorough study was conducted to investigate thermal debinding and sintering. The free defect of brown and sintered parts were produced. It was produced at 1360 °C by 1 °C/min within 240 minutes of soaking time in argon tube furnace. It was recorded the high strength of 782.48 MPa and 154.96 hv. Overall, this work revealed that the potential of using the waste plastic bag as a green binder for 316L Stainless Steel of MIM was achievable.

Item Type:Thesis (Masters)
Subjects:T Technology > TN Mining engineering. Metallurgy
ID Code:9915
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:27 Mar 2018 11:27
Last Modified:27 Mar 2018 11:27

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