Influence of stearic acid on suspension structure and green microstructure of injection-molded zirconia ceramics

Wenjea J. Tseng, Dean-Mo LIu, Chung King Hsu

Research output: Contribution to journalArticle

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Abstract

The effect of stearic acid (added as a surfactant and/or a lubricant) on powder dispersion and particle packing of a zirconia ceramic/binder system has been investigated. Microstructural examination revealed that the addition of stearic acid prevented the particles from making a direct surface-to-surface contact. Contrarily, an insufficient coverage of the acid onto the powder surface resulted in a formation of particulate networks and led to an increase in suspension viscosity. A significant reduction in the most frequent pore size of the thermally debound samples was found as the fraction of stearic acid exceeded 3 wt% on the basis of powder loading. This corresponds to a nominal > 90% of surface coating by the adsorbed acid before being blended with the wax/polymer as a binder. The acid adsorption gradually reached a plateau as the acid increases above 3 wt%. High acid quantities (> 5 wt%) are detrimental to the molding integrity as cracks were observed during thermal removal of the binder.

Original languageEnglish
Pages (from-to)191-195
Number of pages5
JournalCeramics International
Volume25
Issue number2
DOIs
StatePublished - 1 Jan 1999

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