Chapter 22. Foreign Object Damage of Two Gas-Turbine Grade Silicon Nitrides at Ambient Temperature
- Hua-Tay Lin,
- Mrityunjay Singh
Published Online: 26 MAR 2008
DOI: 10.1002/9780470294741.ch22
Copyright © 2002 The American Ceramic Society
Book Title
26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3
Additional Information
How to Cite
Choi, S. R., Michael Pereira, J., Janosik, L. A. and Bhatt, R. T. (2008) Foreign Object Damage of Two Gas-Turbine Grade Silicon Nitrides at Ambient Temperature, 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.ch22
Publication History
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2002
Book Series:
ISBN Information
Print ISBN: 9780470375785
Online ISBN: 9780470294741
- Summary
- Chapter
- References
Keywords:
- silicon nitrides;
- indentation;
- fractography;
- diameter;
- morphologies
Summary
Foreign object damage (FOD) behavior of two commercially available gas-turbine grade silicon nitrides (AS800 and SN282) was determined at ambient temperature through extensive strength testing of flexure test specimens impacted by steel-ball projectiles with a diameter of 1.59 mm in a velocity range from 220 to 440 m/s. AS800 silicon nitride exhibited a greater FOD resistance over SN282, primarily due to its greater value of fracture toughness (KIC). This key factor (KIC) affecting FOD resistance was further evidenced by the indentation strength response of both materials as well as by a quasi-static phenomenological impact model. The damage generated by projectile impact seemed to be in the forms of well- or ill-developed cone cracks and of lateral cracks.