Extrusion of ceramic emulsions: Preparation and characterization of cellular ceramics

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.

keywords

POROUS ALUMINA CERAMICS; PARAFFIN EMULSIFIED SUSPENSIONS; THERMAL-CONDUCTIVITY; PLASTIC BEHAVIOR; FOAMS; PERMEABILITY; CONSOLIDATION; TEMPERATURE; PERFORMANCE; COMPOSITES

subject category

Chemistry; Materials Science; Mineralogy

authors

Freitas, C; Vitorino, N; Ribeiro, MJ; Abrantes, JCC; Frade, JR

our authors

acknowledgements

This work was developed within project PTDC/CTM-ENE/2073/2012 and CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013, and PEst-C/CTM/LA0011/2013, and grants SFRH/BPD/99367/2013 and IF/00302/2012), funded by FCT/MEC and when applicable co-financed by FEDER under the P12020 Partnership Agreement.; SEM facilities were funded by FEDER Funds through QREN-Aviso SAIECT-IEC/2/2010, and Operacao NORTE-07-0162-FEDER-000050.

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