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Stability of concentrated suspensions of Al2O3–SiO2 measured by multiple light scattering

The stability of ceramic suspensions can be predicted by zeta potential and particle size measurements but a major problem is that most existing techniques make use of diluted suspensions so that the concentrated suspensions frequently used in shape forming of ceramics are out of range. The propagat...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2009-03, Vol.29 (4), p.603-610
Main Authors: Burgos-Montes, Olga, Moreno, Rodrigo
Format: Article
Language:English
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Summary:The stability of ceramic suspensions can be predicted by zeta potential and particle size measurements but a major problem is that most existing techniques make use of diluted suspensions so that the concentrated suspensions frequently used in shape forming of ceramics are out of range. The propagation of light through a concentrated suspension can be used to characterise its colloidal stability. Variations of the structure of concentrated ceramic suspensions maintained at rest by multiple light scattering were studied. This technique allowed information to be obtained about the agglomeration processes that took place during ageing, such as particle migration and particle aggregation. The results were compared with those obtained using conventional techniques such as predictive tests (e.g. zeta potential and rheological behaviour of fresh suspensions) and ageing studies measured by rheometry. For such a purpose, aqueous suspensions of alumina and alumina/silica (used to produce mullite by reaction sintering) were studied.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2008.07.044