Chapter 58. Environmental Durability of BN-Based Interphases (for SiCf/SiCm Composites) in H2O Containing Atmospheres at Intermediate Temperatures

  1. J. P. Singh
  1. G. N. Morscher1,
  2. D. R. Bryant2 and
  3. R. E. Tressler2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch58

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Morscher, G. N., Bryant, D. R. and Tressler, R. E. (1997) Environmental Durability of BN-Based Interphases (for SiCf/SiCm Composites) in H2O Containing Atmospheres at Intermediate Temperatures, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch58

Author Information

  1. 1

    Case Western Reserve University, Cleveland, OH 45106

  2. 2

    Pennsylvania State University, University Park, PA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • nicalon fiber;
  • interphases;
  • processing temperature;
  • interphase;
  • sliding behavior

Summary

The effect of H2O containing environments on the stability of BN interphases was assessed for several BN-based interphases fabricated by different routes. Hi-Nicalon or Nicalon fiber, CVI SiC matrix minicomposites with BN interphases that were deposited at different temperatures (1050 to 1800°C) or doped with Si were subjected to ends-on oxidation in a variety of H2O/O2 containing environments at intermediate temperatures (700–800°C) and times (1–100h). The samples were observed qualitatively to determine if the BN interphase had volatilized, formed a glass, or remained intact. Several samples were longitudinally polished to determine the distances of BN recession. It was found that the higher the BN processing temperature the more durable the BN in the H20 containing environments. Si-doping the 1400°C BN resulted in about the same durability as the 1800°C BN.