Chapter 21. Oxidation of 3D-C/C Composites in Presence (or not) of Catalytic Impurities: Kinetics and Effect on Mechanical Properties

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Emmanuel Duvivier,
  2. Christian Robin-Brosse and
  3. Roger Naslain

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch21

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Duvivier, E., Robin-Brosse, C. and Naslain, R. (2006) Oxidation of 3D-C/C Composites in Presence (or not) of Catalytic Impurities: Kinetics and Effect on Mechanical Properties, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch21

Author Information

  1. LCTS, University Bordeaux 1 33600 Pessac, France

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • interlaminar;
  • microdebonding;
  • cte-mismatch;
  • oxidizing;
  • atmosphere

Summary

3D–C/C composites were fabricated from a 0° × 60° stack of 1D–C (ex–PAN) fiber layers needled in the Z–direction. The preforms were densified with pyrocarbon by CVI and the composites submitted to a high temperature treatment (HTT). Oxidation kinetics in air, in presence or not of a catalytic impurity (K2CO3) were assessed by thermogravimetric analyses. The oxidation rate (Vp) depends on several parameters including burn off level (tOX), temperature, occurrence of moisture and catalytic impurity. At a given tOX value, thermal variations of Vp obey an Arrhenius law (for 550 < T < 800°C) with an apparent activation energy Ea = 205 kJ/mol. Catalytic impurity dramatically increases oxidation rate, the effect being particularly noticeable at low tOX values and enhanced in wet air. Oxidation alters the mechanical properties in terms of compressive, interlaminar shear and tensile behaviors, the effect being already significant for low tox values.