Manufacturing defects and the evidence of thermomechanical fatigue in a ceramic vacuum furnace tube

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Efforts were directed towards a post-mortem failure analysis of a silicon-carbide tube that failed after cyclic operation in a vacuum furnace. In formulating a plausible scenario for the failure of the reaction-bonded tube, both the fracture record retained by the tube remnants and service history were analyzed. Results of the fractographic analysis indicated thermomechanically induced low-cycle fatigue in the silicon-carbide originating from severe defects on the internal (heated) surface. These defects were the result of poor infiltration of silicon into resident porosity during the fabrication of the tube. A review of the service history confirmed the likelihood of a fatigue scenario because of potentially deleterious explosions caused by delayed burner ignition in addition to operational thermal-transients experienced during forced cool-downs.

Original languageEnglish (US)
Pages (from-to)1184-1190
Number of pages7
JournalEngineering Failure Analysis
Issue number7
StatePublished - Oct 1 2006


All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Mechanical Engineering

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