|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors VII
||Chemical Compatibility of Refractory Carbides with Hydrogen at Very High Temperatures Relevant for Nuclear Thermal Propulsion Applications
||Kelsa Benensky, Steven Zinkle, Kurt Terrani
|On-Site Speaker (Planned)
Through the use of hydrogen propellant and high operating temperature, nuclear rockets have the potential for twice the specific impulse of the best chemical engines and high thrust, thereby reducing transit times and launch mass for manned interplanetary missions. Refractory carbides are enabling materials for nuclear thermal propulsion because of their extremely high melting temperatures and anticipated hydrogen compatibility. However, there exist knowledge gaps in the corrosion behavior of most materials (including refractory carbides) in flowing hydrogen for temperatures expected at the reactor outlet (2000 – 2700 K). This presentation summarizes recent weight change and microstructural characterization results on corrosion behavior of silicon, titanium, zirconium, and niobium carbide tested at temperatures of 2000 - 2750 K and compares this behavior to existing models. For example, CVD SiC exhibits adequate compatibility with hydrogen up to 2500 K. Preliminary research on secondary effects including gas velocity and sample geometry are also presented.
||Planned: Supplemental Proceedings volume