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Pressure Sensitivity for Particle Packing of Aqueous Al 2 O 3 Slurries vs Interparticle Potential
Author(s) -
Chang Jeanne C.,
Lange Fred F.,
Pearson Dale S.,
Pollinger John P.
Publication year - 1994
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.1151-2916.1994.tb05415.x
Subject(s) - slurry , aqueous solution , isoelectric point , electrolyte , relative density , analytical chemistry (journal) , sphere packing , materials science , chemistry , chromatography , chemical engineering , mineralogy , composite material , sintering , organic chemistry , electrode , engineering , enzyme
The relation between relative density and applied network pressure has been determined for aqueous Al 2 O 3 slurries prepared with different interparticle potentials and consolidated by centrifugation. Attractive interparticle potentials were obtained by either changing the pH to the isoelectric point or adding an excess electrolyte. A range of centrifugal speeds produced consolidation pressures between 10 –3 and 10 MPa. At lower speeds, the density gradient was determined with an X‐ray absorption technique. The maximum packing density (0.62 ± 0.02) was achieved for both dispersed and coagulated slurries at network pressures >0.5 MPa. At lower pressures, thepacking density of these slurries was pressure‐dependent, where the coagulated (salt added) slurries had a relative density between that of the dispersed and flocced slurries. Slurries flocculated by adjusting the pH to the isoelectric point never reached the highest packing density at the largest pressure.