Tribochemical interactions of Si-doped DLC film against steel in sliding contact |
| |
Authors: | Duc-Cuong Pham Hyo-Sok Ahn Jae-Eung Oh Eui-Sung Yoon |
| |
Affiliation: | 1.Nanobio Research Center,Korea Institute of Science and Technology,Seoul,Korea;2.Faculty of Mechanical Engineering,Hanoi University of Technology,Hanoi,Vietnam;3.Department of Nano/IT Engineering,Seoul National University of Technology,Seoul,Korea;4.School of Mechanical Engineering,Hanyang University,Seoul,Korea |
| |
Abstract: | This study concerns the effects of tribochemical interactions at the interface of Si-DLC (silicon-doped diamond-like carbon)
film and steel ball in sliding contact on tribological properties of the film. The Si-DLC film was over-coated on pure DLC
coating by radio frequency plasma-assisted chemical vapor deposition (r.f. PACVD) with different Si concentration. Friction
tests against steel ball using a reciprocating type tribotester were performed in ambient environment. X-Ray photoelectron
spectroscopy (XPS) and auger electron spectroscopy (AES) were used to study the chemical characteristics and elemental composition
of the films and mating balls after tests. Results showed a darkgray film consisting of carbon, oxygen and silicon on the
worn steel ball surface with different thickness. On the contrary, such film was not observed on the surface of the ball slid
against pure DLC coating. The oxidation of Si-DLC surface and steel ball was also found at particular regions of contact area.
This demonstrates that tribochemical interactions occurred at the contact area of Si-DLC and steel ball during sliding to
form a tribofilm (so called transfer film) on the ball specimen. While the pure DLC coating exhibited high coefficient of
friction (∼0.06), the Si-DLC film showed a significant lower coefficient of friction (∼0.022) with the presence of tribofilm
on mating ball surface. However, the Si-DLC film possesses a very high wear rate in comparison with the pure DLC. It was found
that the tribochemical interactions strongly affected tribological properties of the Si-DLC film in sliding against steel. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|