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Stressed oxidation of c/sic composites
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Eckel, Andrew J. Cawley, James D. Halbig, Michael C. Brewer, David N. |
| Copyright Year | 1997 |
| Description | Constant 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. |
| File Size | 557024 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970018376 |
| Archival Resource Key | ark:/13960/t0ms8nq9z |
| Language | English |
| Publisher Date | 1997-04-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Microcracks Scanning Electron Microscopy Ceramic Matrix Composites Silicon Carbides Ceramics Residual Strength Time Dependence Carbon Fibers Debonding Materials Fiber-matrix Interfaces High Temperature Tests Strain Distribution Oxidation Microstructure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
