Exploitation of interparticle forces in the processing of colloidal ceramic materials

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Wet colloidal processing techniques such as milling, spray drying, slip casting, pressure filtration and centrifugal casting may be employed to produce ceramics of improved reliability. Each of these processes requires specific rheological behaviour which is governed by the type and nature of interparticle forces in the suspensions. This paper illustrates the use of various surface chemistry controls such as pH, ionic strength and adsorbing additives to obtain the different interparticle forces. These include the electrostatic, van der Waals, steric, bridging and 'hydrophobic' forces. Steric, bridging and 'hydrophobic' forces arise only in the presence of an adsorbing additive. The type of interaction force is determined by the nature of the adsorbing additives. Small hydrophilic additives such as low Mw polyacrylic acid give rise to mainly steric interaction. High Mw polyacrylic acids cause both steric and bridging interactions. Surfactants such as sodium dodecyl sulphate produce 'hydrophobic' interactions. All these forces greatly affect the yield stress of the ZrO2 suspensions. Steric interaction improves the consolidation of suspension in compression while the bridging interaction has the opposite effect.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
JournalMaterials and Design
Volume15
Issue number3
DOIs
Publication statusPublished - 1 Jan 1994
Externally publishedYes

Fingerprint

carbopol 940
Ceramic materials
Suspensions
Processing
Centrifugal casting
Spray drying
Acids
Sodium dodecyl sulfate
Ionic strength
Surface chemistry
Surface-Active Agents
Sodium Dodecyl Sulfate
Consolidation
Yield stress
Electrostatics
Casting
Compaction
Surface active agents

Cite this

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Exploitation of interparticle forces in the processing of colloidal ceramic materials. / Leong, Y. K.

In: Materials and Design, Vol. 15, No. 3, 01.01.1994, p. 141-147.

Research output: Contribution to journalArticle

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