Role of the Third Body in Life Enhancement of MoS2
NAVAL RESEARCH LAB WASHINGTON DC SURFACE CHEMISTRY BRANCH
Pagination or Media Count:
A lubrication replenishment process that accounts for the long life of MoS2 coatings worn heavily early in sliding is described and quantified. Reciprocating sliding of a steel ball against MoS2 coated flats was performed using a new test methodology called stripe testing to monitor wear evolution. Worn surfaces were characterized with optical Nomarski and Michelson interference microscopy, as well as energy dispersive X-ray spectroscopy. Two important third-bodies, the ball transfer films and compacted debris patches at track turnaround points, were identified. Material transfer between the track and ball surfaces acts as a reservoir of solid lubricant and plays an important role in sustaining lubricated sliding of MoS2. Dynamics of the process were inferred from measurements of third-body material loss and buildup on track and ball surfaces.
- Physical Chemistry
- Test Facilities, Equipment and Methods