Chapter 29. Degradation of SiC/BN/SiC Composite in the Burner Rig

  1. Don Bray
  1. Linus U. Ogbuji

Published Online: 23 MAR 2010

DOI: 10.1002/9780470294499.ch29

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

How to Cite

Ogbuji, L. U. (1998) Degradation of SiC/BN/SiC Composite in the Burner Rig, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294499.ch29

Author Information

  1. NASA Lewis Research Center, Cleveland, OH 44135

Publication History

  1. Published Online: 23 MAR 2010
  2. Published Print: 1 JAN 1998

ISBN Information

Print ISBN: 9780470375594

Online ISBN: 9780470294499

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Keywords:

  • preheating;
  • counterflow layer;
  • velocities;
  • gravimetrically;
  • counterflow

Summary

A SiC/BN/SiC composite with melt-infiltrated SiC matrix and High-Nicalon™ fiber reinforcements was exposed in a burner rig at 600–1200°C, followed by mechanical testing and microstructural examination. Severe loss of strength and ftacture strain occurred at 600–900°C, and was attributed to degredation of the BN interphase with consequent bonding of adjacent fibers. Control samples oxidized in fbrnaces of various moisture contents were not so degraded. It is concluded that the fast removal of a C sublayer beneath the BN interphase provided a conduit for the pervasive penetration of the ambient from exposed fiber ends.