Processing of Mullite Ceramics Using Fly Ash and Alumina

  1. Prof. Dr. G. Müller
  1. N. Quaranta1,†,
  2. S. Camelli1,
  3. M. Caligaris1,
  4. E. Benavidez1,
  5. R. Caligaris1,‡,
  6. A. R. Boccaccini2 and
  7. H. Kern2

Published Online: 27 APR 2006

DOI: 10.1002/3527607293.ch31

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

How to Cite

Quaranta, N., Camelli, S., Caligaris, M., Benavidez, E., Caligaris, R., Boccaccini, A. R. and Kern, H. (2000) Processing of Mullite Ceramics Using Fly Ash and Alumina, in Ceramics - Processing, Reliability, Tribology and Wear, Volume 12 (ed G. Müller), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607293.ch31

Editor Information

  1. Fraunhofer-Institut für Silicatforschung, Neunerplatz 2, 97082 Würzburg, Germany

Author Information

  1. 1

    Universidad Tecnológica Nacional, San Nicolás, Argentina

  2. 2

    Technische Universität Ilmenau, Ilmenau, Germany

  1. CIPBA Researcher

  2. CONICET Researcher

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301942

Online ISBN: 9783527607297

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Keywords:

  • mullite ceramics from fly ash and alumina;
  • processing

Summary

The objective of this work was to study the feasibility of using coal power station fly ash as a raw material for the production of ceramic bodies of mullite composition. The fly ash was obtained from a coal power station in Argentina. The as-received ash is composed of water, unburned coal and mineral silicate ash. Mullite-containing ceramic materials from fly ash and alumina mixtures were obtained by cold pressing and reaction sintering. The relative amount of alumina and fly ash and the sintering conditions were optimised in order to obtain high quality, dense bodies with the possible maximum amount of fly ash. The sintering temperature was in the range 1200–1600 °C. Fairly dense mullite-containing materials could be produced at a sintering temperature of 1500 °C from alumina-fly ash mixtures with 30 wt% alumina content. The materials were characterised in terms of microstructure, density, phase composition and hardness. The present study shows a new way for the utilisation of fly ash in the fabrication of mullite ceramics, which is attractive both from an environmental and from an economical point of view.