Chapter 18. Glass-Ceramic Sol Gel Coating of Ceramic Fibers

  1. John B. Wachtman Jr.
  1. Guillermo R. Villalobos and
  2. Robert F Speyer

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch18

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

Villalobos, G. R. and Speyer, R. F. (1994) Glass-Ceramic Sol Gel Coating of Ceramic Fibers, 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.ch18

Author Information

  1. School of Materials Science and Engineering Georgia Institute of Technology Atlanta, GA 30332–0245

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:

  • lithium aluminosilicate sol gel;
  • heat treatment;
  • sol gel dip coatings;
  • substrate geometry;
  • multifilament tows

Summary

A lithium aluminosilicate sol gel designed to have a composition corresponding to 1Li2O-1Al2O3-4SiO2 was formulated using tetraethyl orthosilicate, lithium nitrate, and aluminum nitrate. This solution was used to coat Nicalon SiC fiber tows (∼500 fibers) using a dipping process. An oxide concentration of 70–90 g oxide per liter water/methanol showed the most uniform fiber coating, with a minimum of bridging between fibers. Higher methanol/water ratios fostered improved coatings. Heat treatment of the coated fibers to 900°C caused them to devitrify to predominantly β-spodumene (LiAlSi2O6) solid solution.