ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 42, (4) 177 - 185 (1998)


THE CAPILLARY VISCOMETER METHOD FOR THE RHEOLOGICAL CHARACTERIZATION OF THERMOPLASTIC CERAMIC PASTES
 
Pabst Willi, Havrda Jiří, Gregorová Eva
 
Department of Glass and Ceramics, Institute of Chemical Technology, Technická 5, 166 28 Prague

A variant of the well-known capillary viscometer method is described which is able to measure the rheological behavior of thermoplastic ceramic pastes in dependence of the temperature. The construction of the heated viscometer is shown, the principle of measurement is explained and for a selected paste (an alumina paste with 66 vol.% solid content designed for injection-molding) at two distinctly different temperatures the complete evaluation procedure is demonstrated. Attention is also paid to the assumptions underlying the evaluation procedure, especially the Mooney-Rabinowitsch correction, and the accuracy of the method is discussed where possible.


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