Chapter 20. Measurement of the Matrix/Fiber Interfacial Strength of Carbon/Carbon Composites

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Soydan Ozcan,
  2. Bijay Gurung and
  3. Peter Filip

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch20

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

Ozcan, S., Gurung, B. and Filip, P. (2006) Measurement of the Matrix/Fiber Interfacial Strength of Carbon/Carbon Composites, 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.ch20

Author Information

  1. Department of Mechanical Engineering and Energy Processes Center for Advanced Friction Studies Southern Illinois University at Carbondale Carbondale, IL, 62901–4343, USA

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:

  • heat treatment temperature (HTT);
  • high resolution scanning electron microscopy (HRSEM);
  • graphitization;
  • exhibiting;
  • jeol

Summary

The fiber/matrix interface properties critically influence the thermal and mechanical properties of composites, and have significant impact on frictional performance of carbon based composites. The effects of heat treatment temperature (HTT) on the fiber/matrix interfacial strength of PAN–based carbon fiber reinforced carbon matrix composites (C/C) were investigated by performing a single fiber push–in test. Commercial C/C brake samples were heat treated at three different temperatures (1800°C, 2100°C and 2400°C). A nanoindenter was used and loads between 20mN and 500mN were applied for push–in tests using a flat end conical indenter. Several thicknesses of samples were tried within the range of 100μum to 1000μum to eliminate the effect of sample geometry during the push–in test. High resolution scanning electron microscopy (HRSEM) was employed to explore any cracks in the vicinity of indents. In addition, High resolution Transmission Electron Microscopy (TEM) was used to observe the microstructure development of the carbon fiber, CVI matrix and the interface as a function of heat treatment temperature. The measured average interfacial debonding stresses ranged from 10MPa to 27MPa for samples heat treated at different temperatures. When compared to as received commercial samples, interfacial strength slightly decreased after heat treatment at 1800°C and subsequently increased with increasing HTT. These changes were ascribed to development of microstructure at the C–fiber/matrix interface.