Insights on low-friction mechanism of amorphous carbon films from reactive molecular dynamics study

Authors
Li, XiaoweiWang, AiyingLee, Kwang-Ryeol
Issue Date
2019-03
Publisher
ELSEVIER SCI LTD
Citation
TRIBOLOGY INTERNATIONAL, v.131, pp.567 - 578
Abstract
The dependence of friction behaviors of the self-mated a-C system on sliding velocity, v, and contact pressure, P, was investigated systematically by reactive molecular dynamics simulation. Results demonstrated that the friction coefficient and sp(3)-to-sp(2) transformation of interfacial structure were more sensitive to the contact pressure than the sliding velocity. By analyzing the relation of friction coefficient and interfacial hybridization structure with P/v ratio, it suggested that the low friction coefficient, which was accompanied by the low sp(2) fraction, was strongly dependent on the passivation of friction interface as the primary mechanism. These findings disclose the proof for passivation mechanism mentioned in previous experiments, and also provide the potential strategy to fabricate new nanocomposite a-C films by surface/interface modification for tribo-applications.
Keywords
DIAMOND-LIKE CARBON; TOTAL-ENERGY CALCULATIONS; STRUCTURAL-PROPERTIES; SLIDING VELOCITY; WEAR BEHAVIOR; COATINGS; DLC; TRANSFORMATION; SIMULATIONS; DEPENDENCE; DIAMOND-LIKE CARBON; TOTAL-ENERGY CALCULATIONS; STRUCTURAL-PROPERTIES; SLIDING VELOCITY; WEAR BEHAVIOR; COATINGS; DLC; TRANSFORMATION; SIMULATIONS; DEPENDENCE; Friction behavior; Amorphous carbon; Passivation or graphitization mechanism; Reactive molecular dynamics
ISSN
0301-679X
URI
https://pubs.kist.re.kr/handle/201004/120264
DOI
10.1016/j.triboint.2018.11.021
Appears in Collections:
KIST Article > 2019
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