Chapter 12. Sol-Gel Coating of Fiber Tows

  1. John B. Wachtman Jr
  1. R. S. Hay

Published Online: 28 MAR 2008

DOI: 10.1002/9780470313831.ch12

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8

How to Cite

Hay, R. S. (1991) Sol-Gel Coating of Fiber Tows, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313831.ch12

Author Information

  1. Wright Research Laboratory Wright Patterson Air Force Base, OH 45433

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470375099

Online ISBN: 9780470313831

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Keywords:

  • filaments;
  • microscoly;
  • alumina;
  • paristoltic;
  • viscosity

Summary

The filaments of alumina fiber tows were continuously coated with many different oxides by passing them upward through a water-based sol with hexane floating on top, and then through a heat-treatment furnace. The sol wets the alumina-hexane interface and hexane probably wets the sol-air interface, which causes displacement of excess sol between the filaments. Therefore there was little bridging of coating between filaments and the tows were not cemented together. The coatings were characterized by optical microscopy, SEM, and TEM. Coating thicknesses ranged from 0.005 to 0.1 m̈m per pass, and 0.5 to 2.5 m̈m thicknesses were observed when thirteen coatings were applied sequentially. The major flaws in the coatings appeared to be caused by peeling and subsequent overcoating on later passes; this could probably be controlled by using sols that gel with higher green strength.