Fluid-assisted fatigue crack growth in Si3N4

Daping Yao, Jian Ku Shang

Research output: Contribution to journalConference articlepeer-review


Effect of a fluorinated oil on the growth kinetics of surface cracks was examined in a Si3N4 ceramic under cyclic loading condition. Fatigue crack growth in the oil was found to be faster than in humid air. Comparison of fatigue crack surfaces and profiles in the oil and air indicates that the oil has caused the dissolution of Y-containing grain boundary phase. The dissolution reduced the number of bridging grains behind the crack tip, resulting in a higher fatigue crack growth rate in the oil.

Original languageEnglish (US)
Pages (from-to)625-633
Number of pages9
JournalCeramic Engineering and Science Proceedings
Issue number5
StatePublished - Sep 1994
EventProceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B. Part 2 (of 2) - Cocoa Beach, FL, USA
Duration: Jan 9 1993Jan 14 1993

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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