| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
High Temperature Corrosion and Degradation of Structural Materials
|
| Presentation Title |
Development of Ablation-Resistant, High Emittance Coatings for Carbon/Carbon Composites for Hypersonic Application |
| Author(s) |
Abdullah Al Saad, Carlos Martinez, Rodney W. Trice |
| On-Site Speaker (Planned) |
Abdullah Al Saad |
| Abstract Scope |
During re-entry, the hypersonic leading edges can experience enormous heat fluxes, with surface temperatures greater than 1600℃ expected. While carbon/carbon (C/C) is a candidate material for leading edge structures, it is prone to ablation damage above 500℃. Ablation-resistant coatings can protect the C/C, while emittance can be engineered to lower the leading-edge surface temperature via radiative cooling. In this study, a novel multilayer coating system based on individual layers consisting of borides, carbides, zirconia, and rare-earth oxide as emissivity modifiers is being applied to a C/C surface via pack cementation and plasma spray. Ablation tests are performed to evaluate the efficacy of the multilayer coatings in simulated high heat flux environments. A radiometric emissometer is being developed to measure the spectral emittance of the coating surface at high temperatures up to 1500℃. The outcome of these experiments will help optimize the design of protective, high emittance coatings for C/C composites. |