| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Frictional Ignition of Dissimilar Metals in High-Pressure Oxygen |
| Author(s) |
Andres Garcia Jimenez, Zachary C. Cordero |
| On-Site Speaker (Planned) |
Andres Garcia Jimenez |
| Abstract Scope |
Sliding contacts between dissimilar materials are encountered throughout turbomachines, e.g., in bearings, dynamic seals, and valves. In oxygen-rich environments, frictional heating at these contacts can result in catastrophic metal fires. This talk summarizes our recent experimental and modeling work assessing the ignition behaviors of dissimilar metal contacts using high-speed sliding experiments. Dissimilar metal contacts exhibit a dramatic reduction in friction coefficient with time due to in situ formation of an oxide tribolayer at the rubbing surface. Structural characterization reveals the tribolayer can form via material transfer, resulting in tribolayers with disparate chemistry from the parent metal. Additionally, the friction coefficient matches that of the rotor material from identical metal experiments, the ignition temperature corresponds to the lower ignition temperature of the two alloys, and the ignition time is delayed by using rotor materials with a higher thermal conductivity. These results are generalized into guidelines for selecting ignition-resistant rotor/stator material combinations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Modeling and Simulation, High-Temperature Materials |