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Journal of Materials Science

, Volume 32, Issue 4, pp 949–955 | Cite as

Cyclic fatigue of reaction-bonded silicon nitride at elevated temperatures

  • R. J CHRISTENSEN
  • K. T FABER
Article
  • 44 Downloads

Abstract

Cyclic and static loading tests were performed on reaction-bonded silicon nitride from 1000–1400 °C in air. This porous, fine-grained material contained no glassy grain-boundary phase and exhibited no slow crack growth at room temperature. Under cyclic loading, the crack-growth behaviour at 1000 °C was similar to room-temperature results; however, at 1200 and 1400 °C crack-growth rates increased significantly. Under static loading, significant crack growth was detected at 1000 °C and increased with temperature. Most of the crack growth under cyclic loading was attributed to slow crack-growth mechanisms, but evidence of cyclic crack-growth mechanisms were also observed. Oxidation played a major role in crack-growth velocity at high temperature.

Keywords

Cyclic Loading Silicon Nitride Slow Crack Growth Cyclic Fatigue Primary Crack 

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • R. J CHRISTENSEN
    • 1
  • K. T FABER
    • 1
  1. 1.Department of Materials Science, Robert R. McCormick School of Engineering and Applied ScienceNorthwestern UniversityEvanstonUSA

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