Abstract
The rheological behavior of barium titanate (BaTiO 3) with ammonium polyacrylate (NH 4PA) as a dispersant has been investigated over a range of volumetric solids concentration ( φ=0.1–0.55) in shear rate 1–1000 s −1. The addition of NH 4PA decreased the suspension viscosity pronouncedly. The relative viscosity ( η r) of the suspension defined as the suspension viscosity over the viscosity of the suspending medium was found increasing substantially when φ exceeds 0.4. A derivative of η r, i.e. 1− η r −1/2, appeared linearly proportional to φ; from which, a maximum solids fraction ( φ m) which presents the theoretical solids concentration at which the suspension viscosity approaches infinity was determined as φ m=0.584 for the given suspension system. The η r– φ relationship determined experimentally was compared with various existing models and the (viscosity) predictive capability of the models also discussed.
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