TY - JOUR
T1 - Processing of Highly Concentrated Aqueous α‐Alumina Suspensions Stabilized with Polyelectrolytes
AU - CESARANO, JOSEPH
AU - AKSAY, ILHAN A.
PY - 1988/12
Y1 - 1988/12
N2 - Stability and rheology of aqueous α‐Al2O3 suspensions with poly(methacrylic acid) and poly(acrylic acid) polyelectrolytes were studied as a function of pH, solids loading, and molecular weight. Past work has found polyelectrolyte‐stabilized suspensions to be fairly pH independent at low (e.g., 20 vol%) solids loadings. However, we now show that the effective pH range to provide dispersed and fluid suspensions narrows as the concentration of solids increases as related to interparticle forces. At high solids levels, the presence of excess polymer in solution has detrimental effects on stability, which increases as the molecular weight increases. Finally, with knowledge of these concepts, highly concentrated fluid suspensions of 60 vol% Al2O3 (>85 wt%) with submicrometer‐size particles have been processed. Higher consolidated densities and reduced sintering temperatures are attained when compared with more conventional processing techniques.
AB - Stability and rheology of aqueous α‐Al2O3 suspensions with poly(methacrylic acid) and poly(acrylic acid) polyelectrolytes were studied as a function of pH, solids loading, and molecular weight. Past work has found polyelectrolyte‐stabilized suspensions to be fairly pH independent at low (e.g., 20 vol%) solids loadings. However, we now show that the effective pH range to provide dispersed and fluid suspensions narrows as the concentration of solids increases as related to interparticle forces. At high solids levels, the presence of excess polymer in solution has detrimental effects on stability, which increases as the molecular weight increases. Finally, with knowledge of these concepts, highly concentrated fluid suspensions of 60 vol% Al2O3 (>85 wt%) with submicrometer‐size particles have been processed. Higher consolidated densities and reduced sintering temperatures are attained when compared with more conventional processing techniques.
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U2 - 10.1111/j.1151-2916.1988.tb05792.x
DO - 10.1111/j.1151-2916.1988.tb05792.x
M3 - Article
AN - SCOPUS:0024142576
SN - 0002-7820
VL - 71
SP - 1062
EP - 1067
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 12
ER -