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Mullite Formation in Al2O3/SiO2/SiC Composites for Processing Porous Radiant Burners

Published online by Cambridge University Press:  08 March 2013

Daphiny Pottmaier ,
Jefferson J. Rosario ,
Marcio C. Fredel ,
Amir A.M. Oliveira  and
Orestes E. Alarcon
Daphiny Pottmaier
Affiliation:
Mechanical Engineering Department, Federal University of Santa Catarina, Caixa Postal 476 Campus Trindade, 88040-900 Florianopolis, Brazil.
Jefferson J. Rosario
Affiliation:
Mechanical Engineering Department, Federal University of Santa Catarina, Caixa Postal 476 Campus Trindade, 88040-900 Florianopolis, Brazil.
Marcio C. Fredel
Affiliation:
Mechanical Engineering Department, Federal University of Santa Catarina, Caixa Postal 476 Campus Trindade, 88040-900 Florianopolis, Brazil.
Amir A.M. Oliveira
Affiliation:
Mechanical Engineering Department, Federal University of Santa Catarina, Caixa Postal 476 Campus Trindade, 88040-900 Florianopolis, Brazil.
Orestes E. Alarcon
Affiliation:
Mechanical Engineering Department, Federal University of Santa Catarina, Caixa Postal 476 Campus Trindade, 88040-900 Florianopolis, Brazil.
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Abstract

Use of porous ceramic burners for natural gas combustion is an optimum alternative to enhance energy efficiency and decrease emission of pollutant gases per generated power. Materials requirements for the operation of such porous burners are mainly thermal shock and chemical resistance and those can be reached with cellular ceramics. Mullite was theoretically identified among the best materials for this application; however, its potential was not properly explored yet. Even though mullite can be synthesized from different compounds and processing routes, control of final material characteristics is complicated mainly due to the formation of amorphous phase. In this work, using a technological approach mullite burners were processed by the replication method starting from different mixtures of Al2O3/SiO2/SiC. Rheological study of the slurries has given additives content for the coating of the polyurethane sponges. After varying sintering temperatures up to 1600 °C and isotherm times for 12 h, microstructural aspects and product phases of the final composites were characterized in order to understand the influence of Al2O3/SiO2/SiC ratios in the formation of mullite phase and amorphous content.

Keywords

cellular (material type)sinteringenergy generation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1492: Symposium D/G – Materials for Sustainable Development—Challenges and Opportunities , 2013 , pp. 169 - 175
Copyright
Copyright © Materials Research Society 2013 

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