8. Thermo-Mechanical Properties of Super Sylramic SiC Fibers

  1. Edgar Lara-Curzio
  1. Heemann Yun,
  2. Donald Wheeler,
  3. Yuan Chen and
  4. James DiCarlo

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291221.ch8

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

How to Cite

Yun, H., Wheeler, D., Chen, Y. and DiCarlo, J. (2005) Thermo-Mechanical Properties of Super Sylramic SiC Fibers, in Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2 (ed E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291221.ch8

Author Information

  1. NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982329

Online ISBN: 9780470291221

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Keywords:

  • ceramic matrix composites;
  • thermal conductivity;
  • ceramic matrix composites;
  • sylramic sic fibers;
  • thermo-gravimetric analyses

Summary

Ceramic matrix composites (CMC) reinforced by SiC fibers, such as SiC/SiC, are being targeted for application in hot-section components of advanced propulsion and power generation engines and in first walls of advanced nuclear systems. Two “Super Sylramic” SiC fiber types, recently developed at NASA using the Sylramic fiber from COI Ceramics, are candidates for providing these components with improved thermal capability and improved performance. This paper reports on the ability of these new fiber types, Super Sylramic-iBN and Super Sylramic-SiC, to meet the key fiber requirements of these applications: high strength, high creep-rupture resistance, and high thermal conductivity. For example, creep-rupture tests performed at 1300 to 1450°C show that the creep resistance of these fibers is ∼20 and ∼7 greater than the current Sylramic and Sylramic-iBN fiber types, respectively, that have already been used to demonstrate state-of-the-art SiC/SiC composites. TEM and AES microscopic observations are presented to indicate that these improvements can be correlated with the replacement of weak grain boundary phases with stronger phases that hinder grain boundary sliding more effectively. Preliminary SiC/SiC composite results are also provided for the Super Sylramic fiber types.