Creep in vacuum of woven Sylramic-iBN melt-infiltrated composites |
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Authors: | Gregory N Morscher Reji JohnLarry Zawada David BrewerGreg Ojard Anthony Calomino |
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Affiliation: | a Air Force Research Laboratory, AFRL/RXL, Wright-Patterson AFB, OH, United States b The University of Akron, Department of Mechanical Engineering, Akron, OH, United States c NASA Langley Research Center, Langley, VA, United States d Pratt & Whitney, East Hartford, CT, United States e NASA Glenn Research Center, Cleveland, OH, United States |
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Abstract: | In order to better understand the effect of stressed-oxidation, the performance of woven Sylramic-iBN fiber-reinforced slurry cast melt-infiltrated (MI) composites were tested in creep and fatigue under non-oxidizing conditions. Initially creep and fatigue tests were performed at 1204 °C in an argon atmosphere; however, it was observed that sufficient oxidizing species existed in the environment to degrade the composites in a manner similar to air environments. Therefore, creep and fatigue tests were performed at 1204 °C in a vacuum environment which showed no evidence of oxidation and superior properties to composites subjected to stressed-oxidation conditions. The mechanical results and microscopy of the vacuum and argon are compared to the behavior of these composites tested in air. It was found that the stress-rupture properties of the vacuum-tested composites could be predicted from single fiber creep rupture data assuming reasonable values for the Weibull modulus. |
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Keywords: | A Ceramic-matrix composites (CMCs) B Thermomechanical properties B Environmental degradation |
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