1. Home page
  2. Search

Fabrication of ceramic hollow beads by phase inversion method

This item is provided by the institution :
/aggregator-openarchives/portal/institutions/uoa   

Repository :
Pergamos Digital Library   

see the original item page
in the repository's web site and access all digital files if the item*



Fabrication of ceramic hollow beads by phase inversion method
Vasiliki Chalkia Elena Marathoniti Nikolaos Vourdas Pavlos Pandis Vassilis Stathopoulos
scientific_publication_inproceedings
Επιστημονική δημοσίευση - Ανακοίνωση Συνεδρίου (EL)
Scientific publication - Conference Paper (EN)
2015
In this study ceramic hollow beads with a diameter of around 1-2mm but a uniform size were prepared by a phase inversion method and subsequent thermal treatment. During phase inversion a homogeneous polymer solution is transformed into a two-phase system in which a solidified polymer phase forms a porous structure, while a liquid phase, poor in polymer, fills the pores. In the current study a desired amount of ceramic powder e.g aluminium oxide (Al2O3), yttria-stabilized zirconia (8-YSZ) is added to a polymer solution, which consists of polymer polyethersulfone (PESf) in N-methyl-2-pyrrolidone (NMP). The ceramic/ polymer/ solvent system can be seen as a suspension. Once immersed into a non-solvent (water) for the polymer which is miscible with the solvent, solvent/non solvent exchange takes place, leading to the precipitation of the polymer phase. Ceramic particles are immobilized by the polymer once precipitation takes place. Thermal treatment removes the polymer, forming inorganic beads of porous ceramic structure1. The features of the as formed porous macrostructure of the beads can be largely determined by adjusting parameters of the phase inversion process. The samples were characterized using scanning electron microscope (SEM), mercury intrusion porosimetry and thermogravimetric analysis1-6. The as formed ceramic beads show high degree of porosity and a hierarchical microstructure7-8. This microstructure is maintained even after thermal treatment at elevated temperatures (>1200oC). Critical factors affecting the structure and the properties of the ceramic beads such as viscosity of the slurry, ceramic powder/polymer ratio and sintering temperature were studied. (EN)
Θετικές Επιστήμες
Θετικές Επιστήμες (EL)
Science (EN)
English
Elsevier (EN)
Τμήμα Γενικό
https://creativecommons.org/licenses/by-nc/4.0/
University of Athens
Pergamos Digital Library
Conference Paper



*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)