ACTIVE OXIDATION OF A UHTC-BASED CMC
- Paper number
IAC-11,C2,6,1,x9311
- Author
Dr. David E. Glass, National Aeronautics and Space Administration (NASA), United States
- Coauthor
Mr. Scott Splinter, National Aeronautics and Space Administration (NASA)/Langley Research Center, United States
- Year
2011
- Abstract
The active oxidation of ceramic matrix composites (CMC) is a severe problem that must be avoided for multi-use vehicles. Much work has been done on the active oxidation of silicon-based CMCs such as C/SiC and SiC-coated carbon/carbon (C/C). Ultra high temperature ceramics (UTHC) and UHTC-based CMCs have been proposed as possible material solutions for high-temperature applications. However, little work has been performed on the active oxidation of UHTC-based materials. The intent of this paper is to present test data indicating an active oxidation process for a UHTC-based CMC similar to the active oxidation observed with Si-based CMCs. A UHTC-based CMC was tested in the HyMETS plasma wind tunnel (PWT) (arc-jet) at NASA Langley Research Center, Hampton, VA. The coupon was tested at a nominal surface temperature of 3000°F and 0.026 atm stagnation pressure. A rapid and large increase in surface temperature was noticed with negligible increase in the heat flux, indicative of the onset of active oxidation. It is shown that the surface conditions, both temperature and pressure, fall within the region for passive to active transition (PAT) of the oxidation.
- Abstract document
- Manuscript document
IAC-11,C2,6,1,x9311.pdf (🔒 authorized access only).
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