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Stressed Oxidation of C/SiC CompositesConstant load, stressed oxidation testing was performed on T-300 C/SiC composites with a SiC seal coat. Test conditions included temperatures ranging from 350 C to 1500 C at stresses of 69 MPa and 172 MPa (10 and 25 ksi). The coupon subjected to stressed oxidation at 550 C/69 MPa for 25 hours had a room temperature residual strength one-half that of the as-received coupons. The coupon tested at the higher stress and all coupons tested at higher temperatures failed in less than 25 hr. Microstructural analysis of the fracture surfaces, using SEM (scanning electron microscopy), revealed the formation of reduced cross-sectional fibers with pointed tips. Analysis of composite cross-sections show pathways for oxygen ingress. The discussion will focus on fiber/matrix interphase oxidation and debonding as well as the formation and implications of the fiber tip morphology.
Document ID
19970018376
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Halbig, Michael C. (Army Research Lab. Cleveland, OH United States)
Brewer, David N. (Army Research Lab. Cleveland, OH United States)
Eckel, Andrew J. (NASA Lewis Research Center Cleveland, OH United States)
Cawley, James D. (Case Western Reserve Univ. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1997
Subject Category
Nonmetallic Materials
Report/Patent Number
E-10741
ARL-TR-1373
NASA-TM-107457
NAS 1.15:107457
Meeting Information
Meeting: Composites, Advanced Ceramics, Materials and Structures
Location: Cocoa Beach, Florida
Country: United States
Start Date: January 12, 1997
End Date: January 16, 1997
Sponsors: American Ceramic Society
Accession Number
97N20355
Funding Number(s)
PROJECT: DA Proj. 1L1-61102-AH-45
PROJECT: RTOP 242-20-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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