Thermal and Rheological Behaviour of a Wax Based Binder and an Alumina Feedstock for Micro-PIM Application

A numerical model to predict the powder–binder separation during micro‐powder injection molding

“…Ltd, Kolkata) with the binder system in a volumetric ratio of 45:55. A shear‐thinning binder is designed by mixing paraffin wax (Acros Organics, Germany) and low‐density polyethylene (Goonvean Fibres, UK) in a volumetric ratio of 65:35 as reported earlier 23 . The prepared feedstock is abbreviated as A‐45 and used in the subsequent experimentation.…”

“…On the other hand, the thermal and rheological behavior of the binder and the prepared feedstocks are studied separately. These characterized material properties that are required for mathematical modeling is reported elsewhere 23–25 . Injection molding of the alumina feedstock is carried out with varying injection parameters using an injection molding machine (Baby Plast; Model: 10p/6).…”

“…The basic requirement of a numerical model is to specify material properties to replicate material behavior. Here, material properties for powder and binder are obtained from the manufacturer's datasheet and previously published literature 23,25–28 . The material properties and models that are used in the present study are shown in table form for the alumina powder and binder in Tables 2 and 3, respectively.…”

“…In Table 3, specific heat ($${c_{{\rm{p,b}}}}$$) and latent heat of solidification of the binder are obtained from the DSC analysis, while thermal conductivity ($${\kappa _{\rm{b}}}$$) and viscosity of the binder ($${\eta _{\rm{b}}}$$) are obtained from thermal conductivity analysis and rheology analysis, respectively, as reported by Islam et al 23 …”