Luminita Mara, STEFAN-OVIDIU DIMA, Andrei Sarbu, Liliana Sarbu, Rodica Zavoianu, Octavian Pavel, Dragos TALOI<br>Obtaining of Hydrotalcite-based Ceramic Monoliths through Extrusion<br>The investigation of the effect of additives on the rheological <br>behaviour of the ceramic pastes

Luminita Mara, STEFAN-OVIDIU DIMA, Andrei Sarbu, Liliana Sarbu, Rodica Zavoianu, Octavian Pavel, Dragos TALOI
Obtaining of Hydrotalcite-based Ceramic Monoliths through Extrusion
The investigation of the effect of additives on the rheological
behaviour of the ceramic pastes

Abstract:

In this paper are presented the results of experimental research regarding the behaviour of ceramic pastes based on microcrystalline hydrotalcite [MII1-xMIIIx (OH)2]x+An-x/nmH2O, used for the preparation of monoliths with circular section through extrusion. The experimental studies regarding the rheological behaviour of hydrotalcite pastes lubricated with stearin shows that these materials have viscoplastic behaviour. Two rheological models are proposed (Bingham-Schwedoff and Herschel-Bulkley) for the correlation of experimental data and for the determination of rheological parameters (n and k). It is shown that Herschel-Bulkley model is more appropriate than Bingham-Schwedoff model to describe these ceramic mixtures and that stearin has a lubricating role, improving the flowing parameters. By using the bifactorial analysis of variance it was also investigated, from the statistical point of view, the influence of the studied factors (the content of the plasticizer agent and the shear rate). Keywords: hydrotalcite, ceramic pastes, extrudates, rheology

Issue: 2011, Volume 62, Issue 10

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