Chapter 13. Analysis of Fracture of Reaction-Bonded Si3N4 Turbine Shrouds

  1. William J. Smothers
  1. D. R. Messier1,
  2. L. J. Schioler1,
  3. G. D. Quinn1 and
  4. J. C. Napier2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291092.ch13

Proceedings of the 5th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 2, Issue 7/8

Proceedings of the 5th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 2, Issue 7/8

How to Cite

Messier, D. R., Schioler, L. J., Quinn, G. D. and Napier, J. C. (1981) Analysis of Fracture of Reaction-Bonded Si3N4 Turbine Shrouds, in Proceedings of the 5th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 2, Issue 7/8 (ed W. J. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291092.ch13

Author Information

  1. 1

    Army Materials and Mechanics Research Center Watertown, Mass. 02172

  2. 2

    Solar Turbines International San Diego, Calif. 92138

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1981

ISBN Information

Print ISBN: 9780470373903

Online ISBN: 9780470291092

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Keywords:

  • components;
  • mechanics;
  • temperature;
  • photomicrographs;
  • microscopy

Summary

Reaction-bonded Si3N4 turbine shrouds were examined after failure during engine testing. Test times ranged from 2 to 50 h and maximum turbine inlet temperatures were ≈900°C. Failures were attributed to excessive mechanical stresses caused by rig problems and to thermal shock. Most of the fractures initiated at surfaces, apparently from machining damage. Strengths of bend specimens machined from engine-tested shrouds equaled that of material from untested billets. Estimates of component fracture stresses agreed with values from bend tests of specimens with as-received surfaces.