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Comparative study of Inconel 718 Metal Injection Moulding feedstock using a water soluble binder: The effect of using different molecular weight Polyethylene Glycol on feedstock rheology and debinding

  • : Andrew Hales1, Eva Hnátková2, Davit Bleyan3, Fatos Derguti1, Lukas Jiranek4, Iain Todd1
  • : 1The University of Sheffield, 2Tomas Bata University in Zlín, 3Tomas Bata University in Zlin, 4Beckett MIM
  • : PDF Download
  • : 2014

Abstract

PEG is a common component of water soluble feedstock for metal injection moulding. After injection moulding, PEG is leached out from the components by submersion in water. The processability of Inconel 718 MIM feedstocks having different molecular weight PEG was investigated in this work. Various aspects of the MIM process were considered in order to determine the most suitable water soluble binder composition for a certain application/part. Inconel 718 powder was formulated with a range of PEGs (mW 1500-20,000), poly (methyl methacrylate) (PMMA) and stearic acid (SA) to produce a pelletized feedstock. The powder loading as well as concentration of PMMA and SA were unchanged for each feedstock mixed. The rheological behaviour of each of these feedstocks was analysed to determine injection moulding parameters. Investigations into the mouldability of complex parts and debinding behaviour in water have also been carried out.
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