Poly(viny1 alcohol) (PVA) and citric acid (CA) are a commonly used binder and dispersant, respectively, for aqueous Al 2 O 3 slurries. The competitive adsorption of these additives on A1 2 O 3 from aqueous solution was studied, as was the influence of this competition on the binder migration in centrifugally cast compacts during the drying process. PVA did not influence the adsorption behavior of CA. However, the adsorption of PVA on α‐Al 2 O 3 was strongly reduced by the presence of CA. This displacement of PVA by CA led to a drastically increased segregation of PVA during the drying process.
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Hidber et al. (1995) studied this question.
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