Extrusion of ceramic emulsions: Preparation and characterization of cellular ceramics
authors Freitas, C; Vitorino, N; Ribeiro, MJ; Abrantes, JCC; Frade, JR
nationality International
journal APPLIED CLAY SCIENCE
author keywords Ceramic emulsions; Extrusion; Porous ceramics; Emulsions characterization
keywords POROUS ALUMINA CERAMICS; PARAFFIN EMULSIFIED SUSPENSIONS; THERMAL-CONDUCTIVITY; PLASTIC BEHAVIOR; FOAMS; PERMEABILITY; CONSOLIDATION; TEMPERATURE; PERFORMANCE; COMPOSITES
abstract Recently, much effort has been given to development and/or optimization of porous materials with requirements for intended applications in catalysis, filtration, isolation, etc. In this context, this paper presents processing conditions and the correspondent characterization of cellular ceramics processed by extrusion of ceramic emulsions, obtained by emulsification of red clay, kaolin and alumina suspensions, after sintering at different temperatures. The emulsification of the ceramic suspension in paraffin with a melting point higher than room temperature is the key for the success of this processing method due to the freezing of the organic droplets allowing good stability of matrix during the extrusion process. Experimental results show good microstructural stability, yielding cellular ceramics with mechanical strength up to 30 MPa, permeability up to 3 x 10(-4) m s(-1), and thermal conductivity lower than 0.25 W m(-1) K-1, framed with mentioned applications. (C) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0169-1317
year published 2015
volume 109
beginning page 15
ending page 21
digital object identifier (doi) 10.1016/j.clay.2015.03.011
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Mineralogy
subject category Chemistry; Materials Science; Mineralogy
unique article identifier WOS:000353852900003

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