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Materials 2018, 11(5), 807; https://doi.org/10.3390/ma11050807

Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
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Received: 15 April 2018 / Revised: 9 May 2018 / Accepted: 10 May 2018 / Published: 16 May 2018
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

Hypereutectic Al–Si (20 wt.%) alloy parts were fabricated by employing a powder injection moulding (PIM) technique with a developed multi-component binder system composed of high-density polyethylene (35 wt.%), carnauba wax (62 wt.%) and stearic acid (3 wt.%). The feedstocks contained 83 wt.% metal powders. The debinding process was carried out by a combination of solvent extraction and thermal decomposition. The effects of solvent debinding variables such as kind of solvents, debinding temperatures and time, and the bulk surface area to volume ratios on the debinding process were investigated. Thermal debinding and the subsequent sintering process were carried out in a heating sequence under a nitrogen atmosphere. The influences of sintering temperature and sintering time on the mechanical properties and structure were considered. Under the optimal sintering condition, sintering at 550 °C for 3 h, the final sintering parts were free of distortion and exhibited good mechanical properties. Relative sintered density, Brinell hardness, and tensile strength were ~95.5%, 58 HBW and ~154, respectively. View Full-Text
Keywords: powder injection moulding; hypereutectic Al–Si alloy; debinding; sintering; microstructure; mechanical performance powder injection moulding; hypereutectic Al–Si alloy; debinding; sintering; microstructure; mechanical performance
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Ni, J.; Yu, M.; Han, K. Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy. Materials 2018, 11, 807.

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