posted on 2008-01-30, 17:12authored byIsabel Santacruz, J.G.P. Binner
The rheological behavior of electrosterically dispersed aqueous suspensions composed of
submicron alumina and nano zirconia particles in different ratios and solids contents has been
studied during in-situ coagulation casting. Glucono-δ-lactone was used as the coagulant to
achieve destabilization of the ceramic suspensions by acidifying the suspension so that the pH
became close to the isoelectric point (IEP) for both powders. The effect of the lactone content
and the solids loading were studied on the rheological parameters during the coagulation process
and the conditions optimized to yield homogeneous green samples with a uniform nano zirconia
distribution and densities between 58 and 60% of theoretical. These were subsequently sintered
to yield composites with a final density of 97%.
History
School
Aeronautical, Automotive, Chemical and Materials Engineering
Department
Materials
Citation
SANTACRUZ, I. and BINNER, J.G.P., 2008. Rheological characterization and coagulation casting of Al2O3–nano zirconia suspensions. Journal of the American Ceramic Society, 91(1), pp. 33–40