engleski

Preparation of stable suspensions for slip casting of alumina-zirconia composite

The effect of commercial dispersant DOLAPIX CE64 on rheological behavior of 60 wt. % Al2O3-t-ZrO2 aqueous suspensions was investigated. The mass ratio of Al2O3:t-ZrO2 in prepared concentrated aqueous suspensions was 85:15. Different amount of DOLAPIX CE64 was added to each suspension. Stability of prepared suspensions was determined by zeta potential measurements at different pH values and by determination of rheological properties (flow curves and rheological parameters). Obtained results showed that all suspensions with the addition of DOLAPIX CE64 were stabilized satisfactorily, while the sample without dispersant was unstable. All prepared suspension showed pseudoplastic behavior, which was confirmed by successful application of Power law and Herschel-Bulkley models on rheological data. Measured zeta potential and rheological parameters showed that DOLAPIX CE64 is excellent and efficient dispersant for concentrated Al2O3-t-ZrO2 suspensions.

Al2O3-t-ZrO2 composite; slip casting; zeta potential; rheological parameters

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