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Milling and Suspension Behavior of A1 2 O 3 in Methanol and Methyl Isobutyl Ketone
Author(s) -
SACKS MICHAEL D.,
KHADILKAR CHANDRASHEKHAR S.
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb10588.x
Subject(s) - flocculation , dlvo theory , agglomerate , methyl isobutyl ketone , suspension (topology) , ball mill , chemistry , chemical engineering , particle size , chromatography , sedimentation , particle size distribution , materials science , analytical chemistry (journal) , solvent , colloid , organic chemistry , paleontology , mathematics , homotopy , sediment , pure mathematics , engineering , biology
Milling and suspension behavior of Al 2 O 3 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) Al 2 O 3 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.