| AVS 65th International Symposium & Exhibition | |
| Advanced Surface Engineering Division | Tuesday Sessions |
| Session SE-TuA |
| Session: | Wear, Oxidation and Corrosion Protective Coatings |
| Presenter: | Ali Erdemir, Argonne National Laboratory |
| Authors: | A. Erdemir, Argonne National Laboratory G. Ramirez, Argonne National Laboratory O.L. Eryilmaz, Argonne National Laboratory |
| Correspondent: | Click to Email |
Diamondlike carbon (DLC) coatings are now used in large volumes to mitigate friction and wear-related problems in a wide range of moving mechanical assemblies [1]. In our laboratory, we have developed a class of new catalytically active nanocomposite coatings that can extract DLC type boundary films directly from the hydrocarbon molecules of lubricating oils and gas molecules and thus provide superior friction and wear properties. Specifically, these composite coatings are composed of catalytically active hard and soft nanophases affording exceptional catalytic responsiveness to the hydrocarbon molecules trapped at the sliding contact interface. When tested under lubricated sliding conditions, these coatings can crack or fragment hydrocarbon molecules and then deposit them on sliding surfaces as lubricious and highly protective boundary films. Using TEM, UV Raman and TOF-SIMS, we elucidated the structural chemistry of these boundary films and confirmed that they were indeed similar to conventional DLC films that are currently deposited using plasma-based CVD and PVD processes. TEM also confirmed the presence of graphene and carbon-nano-onions scattered within the tribofilm. Under severe sliding, reciprocating, and scuffing test conditions, these carbon-based boundary films showed extreme resistance to wear and scuffing [2].
[1] S-C. Cha and A. Erdemir, eds., “Coating Technology for Vehicle Applications” Springer, New York, 2015.
[2] A. Erdemir et al., Nature, 536(2016)67-71