About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Behavior at the Nanoscale VI
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Presentation Title |
Tribochemical Formation of Diamond-like Carbon Films on Catalytically-active Noble Alloys |
Author(s) |
Frank W. DelRio, Morgan R Jones, Thomas E Beechem, Anthony McDonald, Tomas F Babuska, Michael T Dugger, Michael Chandross, Nicolas Argibay, John F Curry |
On-Site Speaker (Planned) |
Frank W. DelRio |
Abstract Scope |
Low shear strength organic films were grown in-situ on platinum-gold thin films via cyclic sliding contact in dry nitrogen with trace concentrations of ambient hydrocarbons. Steady-state friction coefficients were found to be as low as µ ≈ 0.015 and inversely proportional to contact pressure, revealing non-Amontonian behavior. At contact pressures above 500 MPa, shear strength dropped, indicating an activated process. The regions of steady-state low friction behavior exhibited spectra similar to diamond-like carbon coatings. Raman spectroscopy identified non-uniformity in areal coverage and relative order with contact pressure. Atomic force microscopy was used to study the formation and growth of these films at the nanoscale; stress- and time-dependent measurements suggested a sublinear increase of film volume with time, and a transition from growth to wear at a contact pressure of 1.2 GPa. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Surface Modification and Coatings, Thin Films and Interfaces |