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Rheological characterisation of electrosterically dispersed alumina suspensions during in situ coagulation
journal contribution
posted on 2007-01-23, 12:09 authored by J.G.P. Binner, Isabel SantacruzA near-net shape route for the production of advanced ceramic
components has been developed that uses carboxylic acid derivatives
as coagulants to achieve the destabilization of electrosterically
dispersed high solids content ceramic suspensions
via pH modification driving the suspension towards its IEP. In
the present work, the effect of the time-dependent in situ hydrolysis
of the coagulant, D-gulonic-c-lactone, on the progressive
destabilization of the precursor suspension to form highly viscous
pastes has been characterized rheologically. The macroscopically
determined dynamic storage and loss modulii, G0 and
G00, obtained during oscillatory investigations have been found to
be sensitive rheological parameters that describe the structural
changes occurring at a microscopic level within the material.
The progression of coagulation has been found to be critically
dependent on the coagulant concentration and suspension temperature.
Increasing either of these variables greatly accelerates
the extent and rate of coagulation. Furthermore, with judicious
control over them, coagulation characteristics approaching idealized
behavior can be obtained.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Pages
383359 bytesCitation
BINNER, J.G.P. and SANTACRUZ, I., 2006. Rheological characterisation of electrosterically dispersed alumina suspensions during in situ coagulation. Journal of the American Ceramic Society, 89(3), pp 863-868Publisher
© American Ceramic SocietyPublication date
2006Notes
This is Restricted Access. This article was published in the journal, Journal of the American Ceramic Society [© Blackwell] and is also available at: www.blackwellpublishing.com/jace.ISSN
0002-7820Language
- en