| Affiliation: | (1) Department for Nanostructed Materials, Jo!["zcaron"]("/content/8ewjnmu4jjypkqxx/xlarge382.gif") ef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia;(2) Glass and Ceramic Engineering Department, CICECO , Aveiro University, Aveiro, Portugal;(3) Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia |
| Abstract: | Due to the hygroscopic nature of fine alumina powders, the presence of water may have a detrimental effect on the rheological properties of a suspension in melted paraffin for low-pressure injection moulding (LPIM). For this reason, a modification of the powder surface from hydrophilic to hydrophobic is essential for the production of high-quality moulded ceramics. In our paper, the efficiency of the application and the chemisorption of protective monomolecular layers of a long-chain carboxylic acid or its salts will be presented. The effect of the powder treatment on the shear viscosity and the viscoelastic properties of the suspensions for LPIM as well as on their stability in terms of the detrimental effect of water will be discussed.This paper was presented at the first Annual European Rheology Conference (AERC) held in Guimarães, Portugal, September 11-13, 2003. |
