Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 24, Issue 10-11, Pages 3155-3168Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2003.11.003
Keywords
extrusion; platelets; rheology; silicates; suspensions; talc
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The rheological behaviour of an industrial talc-based paste featuring a solids volume fraction of 0.49 in a viscous aqueous surfactant solution was studied using a form of capillary rheometry. Standard approaches for determining wall slip velocities yielded non-physical results, although the data could be correlated using the Jastrzebski wall slip condition. The material was also characterised using the Benbow-Bridgwater approach and showed variations with die land diameter which could not be correlated using simple corrections. The parameters obtained featured an accuracy of +/- 20%. Density measurements indicated that dilation and liquid-phase migration were important features of the flow, and that the stresses are chiefly borne by the liquid-phase. The flow behaviour is interpreted in terms of the component properties: the difficulty in rheological characterisation is attributed to shear-induced re-orientation of the talc platelets during flow. (C) 2003 Elsevier Ltd. All rights reserved.
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