Chapter 4. Selective Leaching of Extruded Cordierite Honeycomb Structures

  1. William Smothers
  1. Thomas H. Elmer

Published Online: 28 MAR 2008

DOI: 10.1002/9780470320310.ch4

Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2

Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2

How to Cite

Elmer, T. H. (1986) Selective Leaching of Extruded Cordierite Honeycomb Structures, in Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320310.ch4

Author Information

  1. Corning Glass Works Corning, New York 14831

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780470374443

Online ISBN: 9780470320310

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Keywords:

  • honeycomb structures;
  • cordiente;
  • crystallites;
  • thermal expansion;
  • chemical composition

Summary

The thermal expansion of extruded cordierite honeycomb structures is significantly lowered by leaching. The resulting bodies have a markedly greater thermal shock resistance than untreated structures. Alumina and magnesia are selectively removed from the extruded cordierite (2MgO 2Al2O3 5SiO2)2 ceramics. Scanning electron microscopic examination revealed that the shape of the cordierite crystallites is not altered on leaching, indicating that the leaching process is topotaxial. Extremely high surface areas are obtained by totally leaching such cordierite monoliths. The high surface area is due to microporous silica formed on leaching. Amorphous silica and traces of spinel and aluminum titanate were detected in the totally leached material. Partially leached structures have excellent thermal stability, showing no signs of degrading, even after long-time exposure to elevated temperatures.