| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Frictional Ignition of Dispersion-strengthened Ni-base Superalloys in High Pressure Oxygen Environments |
| Author(s) |
Zachary C. Cordero, Andres Garcia-Jimenez |
| On-Site Speaker (Planned) |
Zachary C. Cordero |
| Abstract Scope |
Frictional ignition of metals is a major risk in the high-pressure, high-temperature gaseous oxygen environments in oxidizer-rich turbopumps. In this work, the frictional ignition behaviors of binary NiCr alloys and two oxide dispersion-strengthened (ODS) alloys (MA754, MA758) were assessed through high-speed sliding experiments in high-pressure oxygen. Structural characterization of the rubbing surfaces on recovered non-ignited samples revealed oxide tribolayers that formed in situ during sliding. All materials exhibited a decay in friction coefficient with time during the early stages of the experiment due to the growth of this oxide tribolayer. An increase in friction coefficient prior to ignition was linked to tribolayer breakdown. MA754 did not ignite under any test condition because of the formation of a robust oxide tribolayer. Structural characterization of the MA754 tribolayer revealed key features that give rise to its ignition resistance. These results suggest guidelines for designing ignition-resistant materials for high efficiency reusable rocket engines. |
| Proceedings Inclusion? |
Planned: |