| Comparison between Capillary Suction Time (CST) and Flow Point Measurements for Determination of Highest Achievable Solids Loading in Ceramic Slurries |
Bimal P. Singh, Ruben Menchavez, Tamura Aya, Masayoshi Fuji and Minoru Takahashi
Pages : 203-209
DOI :10.1080/0371750X.2006.11012302 |
| Abstract |
| This paper presents the comparison of two different techniques, namely, capillary suction time (CST) and flow point measurements for determination of maximum achievable solids loading in slurries. Good agreement was observed between the two techniques for Al2O3 and Y2O3. The shift in isoelectric points (iep) of the powders in presence of a dispersant was determined through zeta potential measurements on dilute suspensions. Specific free energy of interaction between oxides and dispersants was also calculated by using a model based on the electrical double layer theory of surfactant adsorption through shift in isoelectric points. The specific free energy of interaction was found to be higher for Al2O3 (¡Vƒ´G¢XSP = 7.5016) compared to Y2O3 (¡Vƒ´G¢XSP= 6.856), suggesting greater electrical double layer repulsion and hence, better dispersion and solids loading. It has been concluded that the measurement of CST and flow point are two simple but useful techniques for rapid evaluation of a required amount of dispersant for making any flowable suspension with maximum solids loading. |
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