Chapter 54. Effect of High-Temperature Loading on Mechanical Properties of Nicalon Fibers and Nicalon Fiber/SiC Matrix Composites
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1993 The American Ceramic Society
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
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375273
Online ISBN: 9780470314234
- elastic modulus;
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.