Chapter 78. Nextel 610 And 650 Fiber Reinforced Porous Alumina-Yag Matrix Composites

  1. Mrityunjay Singh and
  2. Todd Jessen
  1. Michael K. Cinibulk,
  2. Kristin A. Keller,
  3. Tai-Ii Mah and
  4. Triplicane A. Parthasarathy

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294680.ch78

25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3

25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3

How to Cite

Cinibulk, M. K., Keller, K. A., Mah, T.-I. and Parthasarathy, T. A. (2001) Nextel 610 And 650 Fiber Reinforced Porous Alumina-Yag Matrix Composites, in 25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3 (eds M. Singh and T. Jessen), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294680.ch78

Author Information

  1. Air Force Research Laboratory Materials and Manufacturing Directorate Wright-Patterson Air Force Base, Ohio 45433–7817

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2001

ISBN Information

Print ISBN: 9780470375730

Online ISBN: 9780470294680

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Keywords:

  • alumina;
  • composite;
  • hexaluminate;
  • zirconia;
  • lanthanum

Summary

A two-phase matrix consisting of alumina particles bonded with YAG was reinforced with NextelTM 610 cloth or NextelTM 650 tows. The use of a solution-derived YAG as a second phase in the matrix was intended to coat fibers as well. However, due to the small amount of YAG allowed in the matrix during composite processing, YAG was not homogeneously distributed throughout the matrix and filled only a small fraction of the porosity. Segregation of yttrium was observed at all alumina grain boundaries in the matrix. The stress-strain behavior of the composites was compared to that of composites that did not contain the YAG second phase. In all cases the YAG-containing composites gave higher ultimate stresses and greater strains to failure than the all-alumina composites when processed at 1200°C. Composite strength of the alumina-YAG matrix composites was likely increased by minimizing either fiber degradation or matrix densification. Nextel 650 fiber-reinforced composites heat treated at 1200°C for 100 h had the same reduced strength, due to severe fiber degradation.