Chapter 56. Optimisation of an Alumina Slip for Pressure Filtration

  1. John B. Wachtman Jr.
  1. D. H. Pearce1,
  2. C. B. Ponton1 and
  3. A. J. Jickells2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch56

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Pearce, D. H., Ponton, C. B. and Jickells, A. J. (1994) Optimisation of an Alumina Slip for Pressure Filtration, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch56

Author Information

  1. 1

    IRC in Materials for High Performance Applications and School of Metallurgy and Materials, The University of Birmingham, UK

  2. 2

    British Gas plc, Gas Research Centre, Ashby Road, Loughborough, Leicestershire, UK

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • fabrication of a ceramic matrix composite;
  • difficult processing stages;
  • reinforcing material;
  • matrix material;
  • agglomerates and reinforcing fibres

Summary

In the fabrication of a ceramic matrix composite the most difficult processing stages are usually the introduction of the reinforcing material to the matrix material and subsequent consolidation. The presence of agglomerates and reinforcing fibres in the matrix act to retard densification of the composite. Studies have been carried out on optimising the green state of the composite material, to maximise the green density and minimise shrinkage, with a view to using a volume expansion phase in the matrix, to obtain near-zero dimensional change on sintering. Work has been done on pressure filtration as a possible method of introducing a fine ceramic slurry to a fibre pre-form to form a dense compact. The rheology of the slurry has been investigated in order to optimise the properties for the filtration procedure. The role of the polyelectrolyte dispersant used, control of slurry pH and of the pressing parameters will be discussed in relation to the resulting green state of the matrix.