Chapter 43. Use of Coacervate or Polyphosphate Gel for Coating Process
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1989 The American Ceramic Society, Inc.
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
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1989
Print ISBN: 9780470374863
Online ISBN: 9780470310557
- chemical vapor deposition;
- fiber-reinforced ceramic composites;
- chemical vapor infiltration;
- high fracture toughness;
- carbon-carbon composites
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.