Open AccessFrictional properties of fluorinated diamond-like carbon films prepared by radio frequency reactive magnetron sputtering
Author(s) -
Wang Pei-Jun,
Meifu Jiang,
Du Juan,
Dai Yong-Feng
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.8920
Subject(s) - materials science , raman spectroscopy , diamond like carbon , nanoindenter , graphite , sputter deposition , analytical chemistry (journal) , sputtering , fourier transform infrared spectroscopy , carbon fibers , carbon film , composite material , thin film , nanotechnology , elastic modulus , chemical engineering , optics , chemistry , organic chemistry , physics , engineering , composite number
The fluorinated diamond-like carbon (F-DLC) films are prepared by radio frequency reactive magnetron sputtering with different flow ratios of CHF3 and Ar as a source gas and pure graphite as a target. Surface morphology, hardness, bonding configuration and tribological properties are investigated by atomic force microscope, nanoindenter, Raman spectra, Fourier transform infrared (FTIR) spectra and a ball-on-disk test rig, respectively. The results show that the F-DLC films are distributed compactly and homogeneously and exhibit good friction-reducing behaviors. The minimum of friction coefficient reaches about 0.42 at r=1 ∶6 while the hardness of films is highest. Raman spectra and FTIR spectra reveal that with the increase of r, the fluorine content gradually increases. However, the intensity ratio ID/IG of Raman bands of disordered graphite (D-band) and graphite (G-band) of F-DLC films decreases, which is indicative of the decrease of the fraction of aromatic ring. The results also show that the F content is another significant factor which affects the friction coefficient. The weakening of —CF2 asymmetric stretch vibration intensity and the formation of CFH in C C chains may result in a lower friction coefficient of F-DLC films.