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Zhao F.,Henan University of Science and Technology | Zhao F.,Henan Key Laboratory of Materials Tribology | Pang X.-J.,Henan University of Science and Technology | Pang X.-J.,Henan Key Laboratory of Materials Tribology | And 9 more authors.
Mocaxue Xuebao/Tribology | Year: 2012

(MoSx)-doped diamond-like carbon (a-C:H:Mo:S) films were prepared using a hybrid radio frequency plasma-enhanced chemical vapor deposition and unbalanced magnetron sputtering deposition technique. Their composition, surface topography, nanohardness and thermal stability were investigated. Friction and wear tests at different sliding speed were conducted on a QG-700 tribometer. The friction and wear mechanism was briefly discussed based on the characterizations of frictional surfaces by optical microscope, scanning electron microscopy and energy dispersive spectrometer. The results reveal that the friction coefficient first increases and then decreases with increasing sliding speed, while the wear rate just varies oppositely. The increase in friction coefficient is due to the aggravated surface oxidization in high-humidity environment, but the decrease is most likely due to the friction-induced graphitization.


Zhao F.,Henan University of Science and Technology | Zhao F.,Henan Key Laboratory of Materials Tribology | Pang X.-J.,Henan University of Science and Technology | Pang X.-J.,Henan Key Laboratory of Materials Tribology | And 9 more authors.
Mocaxue Xuebao/Tribology | Year: 2012

MoSx-doped diamond-like carbon (a-C:H:Mo:S) films were prepared using a hybrid radio frequency plasma-enhanced chemical vapor deposition and unbalanced magnetron sputtering deposition technique. Their friction and wear behaviors under different normal loads were investigated on a QG-700 tribometer and 3D surface profilometer. The friction and wear mechanism was briefly discussed based on the characterizations of frictional surfaces. The results reveal that both the friction coefficient and the wear rate first decrease and then increase with increasing normal load, especially at a higher sliding speed, which is considered to be closely related to the friction-induced heating effect.


Pang X.,Henan University of Science and Technology | Pang X.,CAS Lanzhou Institute of Chemical Physics | Pang X.,Henan Key Laboratory of Materials Tribology | Liu X.,CAS Lanzhou Institute of Chemical Physics | Jin B.,CAS Lanzhou Institute of Chemical Physics
Journal of Nanomaterials | Year: 2014

Nanocomposite Ti-Al-C films were deposited by filtered cathodic vacuum arc (FCVA) at different CH4 flows. The deposited films were characterized in terms of elemental and phase compositions, chemical bonds, and texture as a function of CH4 flow rate by XRD, XPS, HRTEM, Raman spectroscopy, and IR spectroscopy. The results show that the TiC grain size decreases from 4.2 to 2.9 nm as the CH4 flow rate increases from 30 to 80 sccm. The analysis of XPS, HRTEM, and Raman spectroscopy shows that the microstructure of deposited films turns from a TiC dominant TiC-C film to a carbon network dominant TiAl-doped a-C film structure as the CH4 flow increases from 30 sccm to 80 sccm. IR spectroscopy shows that most of the hydrogen atoms in the deposited films are bonded to the sp3-hybridized C atoms. All the composition and microstructure change can be explained by considering the plasma conditions and the effect of CH4 flow. © 2014 Xianjuan Pang et al.

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