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

Ceramics-Silikáty 37, (1) 10 - 13 (1993)


A METHOD FOR DETERMINING THE BARODIFFUSION COEFFICIENT OF LIQUID IN CERAMIC SUSPENSION, DESCRIBING ITS BEHAVIOUR ON POURING INTO A POROUS FORM
 
Kováč Miroslav, Havrda Jiří, Kolařík Pavel
 
Institute of Chemical Technology, Department of Glass and Ceramics, Technická 5, 166 28 Prague 6

The effect of the pressure gradient on the transfer of liquid through the ceramic mix during the pouring of the slip into a ceramic mould was studied. A method, based on suction of the liquid through a layer of porous material, where the suspension at the frit is subject to the effect of a pressure difference, was devised for determining the barodiffusion pressure. The barodiffusion coefficient was found to be independent of pressure, and its value for barodiffusion of water in a suspension of α-Al₂O₃ was established as being 3 x 10⁻¹³ m² s⁻¹ Pa⁻¹.


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