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Modeling the Thermostructural Stability of Melt-infiltrated Sic/sic CompositesSiC/SiC composites developed by NASA with Sylramic-iBN fibers and melt-infiltrated (MI) SiC-Si matrices have demonstrated 1000-hour rupture life in air at 100 MPa and 1315OC. Recently it has been determined that a major factor controlling the long-term rupture life of these composites is not environment or stress, but an intrinsic microstructural and strength instability caused by a thermally-induced silicon attack of the Sic fibers. The objective of this paper is to present a simple diffusion-based analytical model which predicts well the observed effects of stress-free thermal exposure on the residual tensile strength of Sylramic-iBN/SiC-Si composites. The practical implications of the model for SiC/SiC composites with MI matrices are discussed.
Document ID
20030112093
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
DiCarlo, James A. (NASA Glenn Research Center Cleveland, OH, United States)
Bhatt, Ramakrishna T. (NASA Glenn Research Center Cleveland, OH, United States)
McCue, Terry R. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2003
Subject Category
Composite Materials
Meeting Information
Meeting: 27th Annual Cocoa Beach Conference and Exposition
Location: Florida
Country: United States
Start Date: January 26, 2003
End Date: January 31, 2003
Sponsors: Department of Defense, American Ceramic Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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