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Effect of Processing Route on the Stability of Aqueous ZrO2 suspensions
Effect of Processing Route on the Stability of Aqueous ZrO2 Suspensions

Keywords: Zirconia,Processing route,Rheology,Stability
氧化锆
,加工路线,流变学,稳定性,悬浮液

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Abstract:

The relationship between processing route and suspension stability in ZrO2-H2O-PANH4 system was investigated through rheology study. The work showed that two suspensions with identical PANH4 concentration and final solution condition but prepared by different routes differed greatly in stability. This behavior is attributed to their different distribution state of PANH4 on ZrO2 surface that is determined by the adsorption affinity depending on pH condition in solution. High affinity at pH 5.0 induces a nonuniform distribution of soluble PAA- (polyacrylicacid) on particle surface, which can flocculate the suspension strongly, while low affinity at pH 9.0 induces an uniform distribution of polymer so that the higher stabilization can be achieved. A simple mathematical model was used to account for the observed results.

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