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

Ceramics-Silikáty 42, (1) 11 - 19 (1998)


THE EFFECT OF PARTICLE SIZE OF α-Al₂O₃ ON RHEOLOGICAL PROPERTIES OF SLURRIES
 
Kuneš Karel, Havrda Jiří, Kadlec Martin
 
Department of Glass and Ceramics, Faculty of Chemical Technology, Technická 5, 166 28 Prague 6

The rheological character and the viscosities of aqueous alumina slurries with particle sizes between 0.62 and 1.9 mm are determined by rotational viscometer measurements. It is shown that the optimum electrolyte concentration in the slurries is clearly proportional to the specific surface of the powder contained and that the viscosity of the slurry (for this optimum electrolyte concentration) increases with increasing powder surface. Thus, apart from the solid phase and electrolyte content, the powder particle size is of principal importance for the rheological properties of the slurry. The maximum solid phase content for slip-casting and the long-term stability are determined for the respective slurries.


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