Analysis of rheological behaviour of titanium feedstocks formulated with a water-soluble binder system for powder injection moulding

作者：Thavanayagam G^*; Pickering K L; Swan J E; Cao P

来源：Powder Technology, 2015, 269: 227-232.

DOI：10.1016/j.powtec2014.09.020

• Powder injection moulding
• Rheological properties
• Polyethylene glycol
• Titanium
• Binder
• Feedstock

Binder selection and formulation are critical in powder injection moulding. Binders play a key role in controlling the rheological properties of a feedstock and influence whether the resulting feedstock can be successfully injection moulded, debound and sintered without defects. A four-step process was used to mix hydride-dehydride titanium alloy (processed) powder (Ti-6Al-4V) with a polyethylene glycol (PEG) based water soluble binder system. The rheological properties, including flow behaviour index, flow activation energy, fluidity and melt flow index of the homogeneous feedstock, were determined with a capillary rheometer. All feedstock formulations exhibited shear thinning flow behaviour. The optimum feedstock consisting of 60 vol.% powder content, 32 vol.% PEG, 6 vol.% polyvinyl butyryl and 2 vol.% stearic acid was suitable for titanium injection moulding.

• 出版日期2015-1