Chapter 43. Use of Coacervate or Polyphosphate Gel for Coating Process

  1. John B. Wachtman Jr.
  1. P. Vast and
  2. G. Palavit

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310557.ch43

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8

How to Cite

Vast, P. and Palavit, G. (1989) Use of Coacervate or Polyphosphate Gel for Coating Process, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310557.ch43

Author Information

  1. Laboratoire de Chimie Appliquée Université des Sciences et Techniques de Lille F59655 Villeneuve d'Ascq. France

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374863

Online ISBN: 9780470310557

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Keywords:

  • chemical vapor deposition;
  • fiber-reinforced ceramic composites;
  • chemical vapor infiltration;
  • high fracture toughness;
  • carbon-carbon composites

Summary

Chemical metaphosphate coatings on various substrate, and especially composite substrates, are developed for antioxidation applications. The metaphosphate sol is transformed either in coacervate or in gel. We describe in this paper the scheme of our process. We give details for the coacervate/gel formulation. The formulation of coacervate or gel is fundamental to optimize the rheological properties of coating. Before drying, water acts as a plasticizer of these amorphous materials. Moreover, other important points for this process as hydrolysis of metaphosphate chains, hydrogen bonds, and cations exchanges are reviewed.