Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19206
Title: Extrusion of ceramic emulsions: Preparation and characterization of cellular ceramics
Author: Freitas, C.
Vitorino, N.
Ribeiro, M. J.
Abrantes, J. C. C.
Frade, J. R.
Keywords: POROUS ALUMINA CERAMICS
PARAFFIN EMULSIFIED SUSPENSIONS
THERMAL-CONDUCTIVITY
PLASTIC BEHAVIOR
FOAMS
PERMEABILITY
CONSOLIDATION
TEMPERATURE
PERFORMANCE
COMPOSITES
Issue Date: 2015
Publisher: ELSEVIER SCIENCE BV
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.
Peer review: yes
URI: http://hdl.handle.net/10773/19206
DOI: 10.1016/j.clay.2015.03.011
ISSN: 0169-1317
Publisher Version: 10.1016/j.clay.2015.03.011
Appears in Collections:CICECO - Artigos



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