OSMOTIC DRYING OF GEL CAST BODIES IN LIQUID DESICCANT

Osmotic drying of gel cast alumina bodies was carried out in water solutions of various polyethylene glycols (PEGs) with molecular weights ranging from 1000 to 80000 g/mol. Up to 30% of the water content could be removed from the gel cast bodies immersed in a 43 wt% solution of PEG 80000. PEG 1000 w...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 31; no. 14; pp. 2519 - 2524
Main Author Trunec, M
Format Journal Article
LanguageEnglish
Published 01.01.2011
Subjects
Aluminum oxide
Desiccants
Dewatering
Drying
Liquids
Moisture content
Molecular weight
Sintering (powder metallurgy)
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Summary:Osmotic drying of gel cast alumina bodies was carried out in water solutions of various polyethylene glycols (PEGs) with molecular weights ranging from 1000 to 80000 g/mol. Up to 30% of the water content could be removed from the gel cast bodies immersed in a 43 wt% solution of PEG 80000. PEG 1000 was a less effective desiccant than the PEGs with higher molecular weights, even if the osmotic pressure was similar (4.9 MPa). The smaller PEG molecules penetrated the gelled bodies and reduced the dewatering. Moreover, the penetrated PEG molecules affected the pore structure of the green bodies and in this way influenced the sintering behaviour. The time dependence of dewatering and the effect of the size of the gel cast bodies were investigated and correlated with the green body structure and sintering behaviour in order to optimise the osmotic drying process.
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ISSN:0955-2219