Molecular tribology of hydrocarbon systems
- Naval Academy, Annapolis, MD (United States)
The development of new technological applications involving diamond coatings has accompanied recent advances in the chemical vapor deposition of diamond coatings. Since a great number of applications involving these films, which pre-dominately show (111) and (100) facets, deal with the motion of diamond on diamond, understanding the tribological properties of these diamond facets is paramount. If the atomic-scale mechanisms which give rise to the observed tribological characteristics were understood, this knowledge might ultimately lead to the design of coatings with specific friction and wear properties. With this in mind, we have been using molecular dynamics to examine the atomic-scale phenomena which govern the friction and wear of diamond surfaces. These simulations have provided insight into the behavior of the friction coefficient as a function of load, temperature, sliding speed, and crystallographic sliding direction when two atomically-flat, hydrogen-terminated, diamond (111) surfaces are in sliding contact. Replacing some of the surface hydrogen atoms with other hydrocarbon groups makes the diamond surface rougher, and perhaps, more realistic. The frictional properties of these surfaces, the specific tribochemical reactions which occur when sliding, and the associated reaction mechanisms, have all been examined for these more realistic surfaces. More recently, we have examined the atomic-scale frictional properties of diamond (100) - (2 x l) reconstructed surfaces. Our results to date, for both diamond (100) and (111) will be summarized in this talk.
- OSTI ID:
- 126263
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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