Chapter 54. Effect of High-Temperature Loading on Mechanical Properties of Nicalon Fibers and Nicalon Fiber/SiC Matrix Composites

  1. John B. Wachtman Jr.
  1. Dileep Singh and
  2. Jitendra P. Singh

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314234.ch54

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10

How to Cite

Singh, D. and Singh, J. P. (1993) Effect of High-Temperature Loading on Mechanical Properties of Nicalon Fibers and Nicalon Fiber/SiC Matrix Composites, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch54

Author Information

  1. Materials and Components Technology Division Argonne National Laboratory, Argonne, IL 60439

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375273

Online ISBN: 9780470314234

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Keywords:

  • degradation;
  • catastrophic;
  • elastic modulus;
  • evaluate;
  • densify

Summary

The strength distribution of as-fabricated Nicalon fibers was obtained from bundle tests. Strength distributions of Nicalon fibers in Nicalon fiber-reinforced silicon carbide (SiC) matrix composite specimens, before and after exposure to elevated temperature (1300°C), were obtained by evaluating fracture mirror size. Strength of the as-fabricated fibers decreased by 50% after incorporation in SiC matrix. Exposure of composites at 1300°C did not show significant strength degradation of reinforcing Nicalon fibers over those in as-fabricated composites. Flexural tests of Nicalon/SiC composites at elevated temperatures (=800°C-1300°C) showed a drop in strength from 400 MPa at room temperature to 270 MPa at 1300°C. The effects of long term exposure at elevated temperature (1200°C) on the composite mechanical properties was also investigated. Results are interpreted on the basis of thermal degradation of Nicalon fibers.