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Temperature induced flocculation of concentrated ceramic suspensions: rheological properties
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 19, 2117-2123 p.Article in journal (Refereed)
Abstract [en]

Concentrated, sterically stabilised ceramic suspensions have been reversibly flocculated by changing the temperature. Using an amphiphilic polymer, Hypermer KD3, as dispersant for alumina and alumina-silicon carbide whisker composite mixtures in pentanol resulted in a transition from dispersed to flocculated state close to room temperature. The collapse of the adsorbed polymer layer with decreasing solvency (temperature) in the marginal solvent pentanol induces flocculation when the long-range van der Waals force overcomes the remaining steric repulsion. Temperature induced flocculation (TIF) has a drastic effect on the rheological properties. At high temperatures, T>30 °C, the suspensions have a low viscosity and neglible elasticity. When the temperature is lowered below 20 °C, the viscosity increases significantly and the viscoelastic behaviour becomes predominatly elastic. The elasticity and the associated particle network strength are sufficiently high for a highly concentrated gelled suspension to support its own weight. The potential use of TIF as a novel forming method was discussed with relation to other new shaping techniques.

Place, publisher, year, edition, pages
1999. Vol. 19, 2117-2123 p.
Keyword [en]
Temperature-induced gelation, shaping, suspensions, Al2O3, SiC
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26884OAI: oai:DiVA.org:ri-26884DiVA: diva2:1053887
Note
A1250Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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