Chapter 72. Creep Rupture Behavior of Oxide/Oxide Nextel ™720/AS and MI SiC/SiC Composites with Effusion Holes

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. Reji John1,
  2. Dennis J. Buchanan2,
  3. Victoria A. Kramb2 and
  4. Larry P. Zawada1

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch72

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

John, R., Buchanan, D. J., Kramb, V. A. and Zawada, L. P. (2002) Creep Rupture Behavior of Oxide/Oxide Nextel ™720/AS and MI SiC/SiC Composites with Effusion Holes, 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.ch72

Author Information

  1. 1

    Air Force Research Laboratory, Materials and Manufacturing Directorate (AFRL/MLLMN), Wright-Patterson AFB, OH 45433–7817, USA

  2. 2

    University of Dayton Research Institute, Dayton, OH 45419, 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:

  • ceramic matrix composites;
  • durability;
  • SiC/SiC ceramic matrix;
  • combustor;
  • effusion holes

Summary

Woven Oxide/Oxide and SiC/SiC ceramic matrix composites (CMC) are targeted for high-temperature aerospace applications such as combustors, combustor liners, exhaust washed structures, exhaust nozzle flaps and seals, and blade outer air seals. Some of these components contain stress concentration sites such as holes and attachment points. Components such as combustors may also include effusion holes, which are used to lay down a film of cooling air on the hot wall to create a boundary layer effect and to cool the component by providing more internal surface area. During service, these locations will be subjected to long-term exposures and thermal stresses. Hence, the knowledge of the effect of sustained (creep) loading on the deformation and rupture of notched oxide/oxide and SiC/SiC composites is required for durability assessment. The results from creep tests of unnotched and notched NextelTM720/Alumina-Silica (NextelTM720/AS-0) and Melt Infiltrated (MI) SiC/SiC are discussed in this paper. NextelTM720/AS-0 was evaluated at 1100°C and SiC/SiC at 982°C and 1200°C in laboratory air. In the case of large notches, i.e., notch length greater than average tow size, the notch-sensitivity increased significantly under sustained loading for both composite. Under sustained loading, the effusion hole (diameter less than tow size) specimens also exhibited notch-sensitivity comparable to that of specimens with large notches.