Chapter 17. Strength and Stability Studies on Mini-Tow Ceramic Composites Made with Nitrided Nextel™ 312 Fibers and Silicon Oxycarbide

  1. Don Bray
  1. S. T. Gonczy1,
  2. K. Oba2 and
  3. K. T. Faber2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294482.ch17

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

How to Cite

Gonczy, S. T., Oba, K. and Faber, K. T. (1988) Strength and Stability Studies on Mini-Tow Ceramic Composites Made with Nitrided Nextel™ 312 Fibers and Silicon Oxycarbide, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294482.ch17

Author Information

  1. 1

    Gateway Materials Technology, Mt. Prospect, IL

  2. 2

    Dept. of Materials Science & Engineering, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, IL

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470375587

Online ISBN: 9780470294482

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Keywords:

  • alumina;
  • oxycarbide;
  • pyrolysis;
  • combustors;
  • ceramic

Summary

Nitridation of Nextel™ 312 alumino-borosilicate fibers produces a boron-nitride-rich surface layer which acts as a debond layer in ceramic composites. This interface-fiber system offers a low cost alternative to CVD deposition of coatings on alumina and silicon carbide fibers. Ceramic fiber composites were made with 6 infiltration/pyrolysis cycles of a nitrided multifilament Nextel™ 312 mini-tow, using Blackglas™ resin to produce a silicon oxycarbide matrix. In the as-prepared condition the Nextel-Blackglas™ mini-tow composites had a mean tensile breaking load of 53 Newtons, a coefficient of variation of 26%, and limited fiber pull-out. The Nextel™ composites were then heat-treated in air at 600°, 800°, and 1000°C to determine oxidation stability. After 600°C oxidation for 200 hours, the Blackglas™ Nextel™ composites retained 75% of the as-prepared tensile break load with a fibrous fracture surface. Oxidation for 24 hours at 1000°C and for 100 hours at 800°C reduced the retained tensile breaking load by 47% and 66% respectively, showing reduced strain-to-failure and distinct embrittlement of the composite.