Title: Open-Porous Silicon Nitride-Based Ceramics in Tubular Geometry Obtained by Slip-Casting and Gelcasting
Authors: Brouzcek, Dominik 
Konegger, Thomas  
Category: Original Research Article
Issue Date: 1-Jul-2017
Journal: Advanced Engineering Materials 
ISSN: 1438-1656
Owing to its unique properties, silicon nitride is a frequently used materials choice in highly demanding applications in terms of thermal and mechanical load. In this work, porous silicon nitride-based support materials in hollow-tube configuration are generated through colloidal forming, and their respective properties for potential applications in the fields of membrane-based separation, filtration, or catalysis are evaluated. Shaping of the ceramics is achieved by two distinct casting techniques, slip-casting, and gelcasting, and the results of the respective methods are set in relation. Furthermore, a special focus is set on the correlation between sintering parameters and resulting porosity. Subsequently, air permeabilities of the generated structures are determined, illustrating a direct relation between processing parameters and resulting permeability. Darcian permeability values of up to 9 · 10 m are observed for samples exhibiting total porosities between 32 and 41 %. The findings allow for a predictability of suitable permeation properties for the structures’ anticipated application as complex-shaped non-oxide ceramic supports for membrane-based separation or catalysis, or as high-performance filter materials. −16 2
Keywords: colloidal processing; gelcasting; porosity; silicon nitride; slip-casting
DOI: 10.1002/adem.201700434
DOI: 10.34726/1041
Organisation: E164-03-1 - Forschungsgruppe Anorganische Werkstoffe 
License: Urheberrechtsschutz 1.0
Publication Type: Article
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