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J.Am. Ceram. SOC., 71 [I21 1062-67 (1988) Processingof Highly Concentrated Aqueous a-Alumina
 

Summary: J.Am. Ceram. SOC., 71 [I21 1062-67 (1988)
Processingof Highly Concentrated Aqueous a-Alumina
SuspensionsStabilizedwith Polyelectrolytes
JOSEPH CESARANO III* and ILHAN A. AKSAY*
Department of Materials Science and Engineering, and Advanced Materials Technology Program, Washington Technology Center,
University of Washington, Seattle, Washington 98195
Stability and rheology of aqueous aY-A1203suspensions with
poly(methacry1ic acid) and poly(acry1ic acid) polyelectrolytes
were studied as a function of pH, solids loading, and molecu-
lar weight. Past work has found polyelectrolyte-stabilizedsus-
pensions to be fairly pH independent at low (e.g., 20 ~ 0 1 % )
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% A1,03 (>85 wt%) with submicrometer-size particles
have been processed. Higher consolidated densities and

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science