Chapter 19. Reducing Firing Defects in a Clay-Based Ceramic

  1. William M. Carty
  1. Rob Crawford

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294734.ch19

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 23, Issue 2

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 23, Issue 2

How to Cite

Crawford, R. (2002) Reducing Firing Defects in a Clay-Based Ceramic, in Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 23, Issue 2 (ed W. M. Carty), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294734.ch19

Author Information

  1. Saint-Gobain Advanced Ceramics, Hamilton, Ontario, Canada

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375778

Online ISBN: 9780470294734

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Keywords:

  • firing defects;
  • clay-based ceramic;
  • molten metal fihers;
  • clay material;
  • thermocouple measurements

Summary

In an attempt to reduce firing defects in clay-based molten metal filters, background and current information was gathered concerning the reaction of the clay material during firing. Testing was performed, including thermocouple measurements, dilarometry, thermal gravimetric analysis, differential thermal analysis, and fukcale production runs. It was found that the clay material undergoes several different reactions/transformations. When coupled with the existing firing profile, cracks tended to form in the preheat section of the kiln. This paper details the mechanics behind the formation of these defects and presents three solutions to the problem that were successfully tested and instituted. These include faster firing of fewer parts, slower firing of more parts, and temperature adjustments to the preheat The best solution depends on the size of the part, the speed of the pressing, the complexity/geometry of the shape, and the limitations of the kiln.