Abstract
Abstract Model aqueous injection moulding (AIM) pastes were investigated by capillary rheology at five levels of solids loading. The critical volume fraction of solids (pm ) was measured by water absorption and estimated by linear and non-linear (where appropriate) extrapolation of the rheological parameters, reciprocal apparent viscosity and reciprocal bulk yield stress. Three models which consider the influence of volume fraction of solids on relative viscosity were considered: the Chong, German, and Krieger–Dougherty equations. An iterative method for estimation of pm , dependent on the model used, was also developed for comparison. The German model using the iterative method for estimating pm gave the best prediction of overall rheological behaviour. The Krieger–Dougherty method using the curve fitted reciprocal bulk shear stress to find pm also gave low errors and correctly predicted a relative viscosity of unity for the pure binder, suggesting an improved prediction over a wider ...
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