Tensile Stress Rupture Behavior of a Woven Ceramic Matrix Composite in Humid Environments at Intermediate Temperature
Kevin J. Larochelle
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Tensile Stress Rupture Behavior of a Woven Ceramic Matrix Composite in Humid Environments at Intermediate Temperature

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Stress rupture tests on the SylramicTM fiber with an in-situ layer of boron nitride, boron nitride interphase, and SiC matrix ceramic matrix composite were performed at 550oC and 750oC with 0.0, 0.2, or 0.6 atm partial pressure of water vapor, pH2O. The 550oC, 100-hr strengths were 75%, 65% and 51% of the monotonic room temperature tensile strength, respectively. At 750oC, the strengths were 67%, 51%, and 49%, respectively. Field Emission Scanning Electron Microscopy analysis estimated the total embrittlement times for 550oC with 0.0, 0.2, and 0.6 atm pH2O were gt; 63 hrs, gt; 38 hrs, and betw...