Chapter 35. A Continuous Liquid Phase Coating Process for Protective Ceramic Layers on Carbon Fibers - Process Optimization for Oxidation Protection and Tensile Strength

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. R. Gadow and
  2. F. Kern

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294826.ch35

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

How to Cite

Gadow, R. and Kern, F. (2003) A Continuous Liquid Phase Coating Process for Protective Ceramic Layers on Carbon Fibers - Process Optimization for Oxidation Protection and Tensile Strength, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294826.ch35

Author Information

  1. University of Stuttgart, IMTCCC Allmandring 7b, D-70569 Stuttgart, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375846

Online ISBN: 9780470294826

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Keywords:

  • ceramic coatings;
  • oxidative;
  • metal matrix composites;
  • carbon fibers;
  • pyrolysis and calcination temperature

Summary

Stable and performing ceramic coatings are essential for the application of carbon fibers in ceramic or metal matrix composites exposed to oxidative or chemically aggressive environments during manufacturing and application. The coated fibers have to retain their high tensile strength and structural integrity in order to be used as reinforcement. The ceramic coatings for carbon fiber filaments were produced by continuous liquid phase coating of HT-type carbon fiber strands with a solution of a preceramic precursor in an organic solvent. By subsequent pyrolysis and calcination carbon fibers with a monofilamentwise ceramic coating were produced. A systematic investigation of the process parameter influence for the continuous liquid phase coating pilot plant and the influence of the composition of the precursor solution was performed. Curing, pyrolysis and calcination temperature as well as the precursor concentration were varied. The properties of single and multiple layer coatings on 12 k fiber strands were measured. Tensile testing of impregnated yarn specimens according to DIN 65382 A was performed. The oxidation stability was measured by exposition of test specimens to hot air at 500°C and higher temperatures. Results show that the oxidation stability is controlled by the chemical composition of the coating, the calcination temperature and the thickness of the coating. The tensile strength of the coated fiber rovings is dependent on the process of multistep thermal treatment.