Consolidation Behavior of Flocculated Alumina Suspensions

Lennart Bergström, Christopher H. Schilling, Ilhan A. Aksay

Research output: Contribution to journalArticle

181 Scopus citations

Abstract

The consolidation behavior of flocculated alumina suspensions has been analyzed as a function of the interparticle energy. Consolidation was performed by a centrifugal force field or by gravity, and both the time‐dependent and equilibrium density profiles were measured by a gamma‐ray absorption technique. The interparicle energy at contact was controlled by adsorbing fatty acids of varying molecular weight at the alumina/decalin interface. We found that strongly attractive interactions result in a particle network which resists consolidation and shows compressible behavior over a large stress range. The most weakly flocculated suspension showed an essentially incompressible, homogeneous density profile after consolidation at different centrifugal speeds. We also found a significant variation in the maximum volume fraction, φm, obtained, with φm∼ 0.54 for the most strongly flocculated suspension to φm∼ 0.63 for the most weakly flocculated suspension. The compresive yield stresses show a behavior which can be fitted to a modified power law. In this paper, we discuss possible correlations between the fitting parameters and physical properties of the flocculated suspensions.

Original languageEnglish (US)
Pages (from-to)3305-3314
Number of pages10
JournalJournal of the American Ceramic Society
Volume75
Issue number12
DOIs
StatePublished - Dec 1992

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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