Abstract
Milling and suspension behavior of Al2O3 were studied in two suspending liquids, i.e. methanol (MeOH) and methyl isobutyl ketone (MIBK). Properties were investigated for various mixed solvent ratios. Ball-milling studies were carried out on powders containing “hard” agglomerates. Agglomerate breakdown was monitored by rheology, sedimentation density, and particle size measurements and by direct microscope observations. Particle size reduction kinetics were observed to decrease at high MIBK/MeOH ratios due to increased flocculation in these suspensions. Suspension behavior of deagglomerated (by ball-milling 20 h) Al2O3 was also investigated. Rheology, sedimentation density, and sedimentation “particle” size distribution measurements demonstrated that increased flocculation occurred at high MIBK/MeOH ratios. Electrophoresis measurements indicated that this behavior was due to decreased electrostatic repulsion between particles. Suspension stability (against flocculation) was analyzed using DLVO theory.
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