An investigation on characteristics and rheological behaviour of titanium injection moulding feedstocks with thermoplastic-based binders

• Published in: Powder metallurgy Vol. 62; no. 4; pp. 229 - 239
• Main Authors: Subaşı, Mehmet, Safarian, Asghar, Karataş, Çetin
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 08.08.2019; SAGE Publications
• Subjects: feedstock; PEG 20000; powder injection moulding; Rheological behaviour; Ti-6Al-4V; Ti-6Al-7Nb; Ti–6Al–4V; powder injection moulding; PEG 20000; Ti–6Al–7Nb; Rheological behaviour; feedstock
• ISSN: 0032-5899; 1743-2901
• DOI: 10.1080/00325899.2019.1635305

The binders used in this work were of two types: binder I, comprising high-density polyethylene, paraffin wax and stearic acid as well as binder II, composing high-density polyethylene, polypropylene, polyethylene glycol 20000, paraffin wax and stearic acid. Therefore, based on these two types of binders, four combinations of feedstocks were categorized as follows: Ti-6Al4V+binder I (A), Ti-6Al-4V+binder II (B), Ti-6Al7Nb+binder I (C) and Ti-6Al-7Nb+binder II (D). The rheological behaviors of feedstocks were investigated at temperatures of 130, 140, 150, 160 and 170°C with different powder loadings varying from 57 to 71% volumetric. At low temperatures (130 °C), all feedstocks were observed to have a dilatant flow, while based on the results obtained from experiments, the suitable injection temperatures for these feedstocks were determined to be 140, 150 and 160°C. The critical powder loadings were found to be 65, 67, 67 and 71 vol.%, for feedstocks A,B,C and D, respectively.