Chapter 31. Strength and Oxidation Resistance of SiC Fibers Coated with Various Si-Containing Compositions

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. A.M. Tsirlin1,
  2. E.K. Fiorina1,
  3. Y.E. Pronin1,
  4. B.I. Shemaev1,
  5. M.A. Khatzernov1,
  6. H.M. Yun2,
  7. G.N. Morscher2 and
  8. J.A. Dicarlo2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch31

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Tsirlin, A.M., Fiorina, E.K., Pronin, Y.E., Shemaev, B.I., Khatzernov, M.A., Yun, H.M., Morscher, G.N. and Dicarlo, J.A. (2008) Strength and Oxidation Resistance of SiC Fibers Coated with Various Si-Containing Compositions, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch31

Author Information

  1. 1

    SRC of RF GNIIChTEOS 38, Shosse Entusiastov st. 111123 Moscow, Russia

  2. 2

    NASA Glenn Research Center Cleveland, OH 44135, USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • SiC;
  • Ti-Si-C;
  • characteristics;
  • thermo-mechanical;
  • deposition

Summary

The structural life of SiC fiber-reinforced ceramic matrix composites for high-temperature applications depends strongly on how well the load-carrying fibers are protected from hostile environments. To understand possible approaches for addressing this need, thin coatings of chemically vapor-deposited B-N (for comparison), Mo-Si, Si-C, and Ti-Si-C, as well as polymer-derived Si-B-N-C, were deposited on tows of Hi-Nicalon SiC-fibers. The coated tows were then oxidized in air at 1300°C. Tow and monofilaments rupture loads at room temperature, plus chemical, physical, and microstructural characteristics of the coatings, were evaluated after deposition. After deposition, the tows coated with BN, Mo-Si, and Si-C displayed higher strength than those coated with the Ti-Si-C and Si-B-N-C. All oxidized coatings showed little change in surface morphology, contrary to the rough cracks observed on uncoated Hi-Nicalon and Hi-Nicalon type-S fibers. Rupture loads on tows differed sufficiently from those on monofilaments and were obviously underestimated owing to the sticking of monofilaments in tows. The key factors controlling strength and strength retention of the coated fibers are discussed.