Improvement of Tribological Behaviour of Biomedical Nanocrystalline Titanium by Magnetron Sputtered DLC/SiC Double Layer Films

Abstract:

The nano-indentation response, the film-substrate adhesion behaviors and the friction and wear properties of the DLC/SiC (diamond-like carbon/silicon carbon) double layer thin films (SiC films as interlayer) deposited on nanocrystalline titanium substrate using magnetron sputtering technique at room temperature were investigated. The results show that the DLC films exhibited a low nano-hardness (7.4 GPa) and Young's modulus (62.2 GPa) but a high hardness-to-modulus ratio (0.119). The films-substrate system displayed a good interface adhesion and a good friction/wear properties with the friction coefficient of about 0.1, the special wear rate in the magnitude order of 10−6 mm3 m−1 N−1 together with little film cracking and interface delaminating even at considerably high contact load, when sliding against Si3N4 (silicon nitride) ball using ball-on-disc wear tester under Kokubo simulation body fluid (SBF) at room temperature. The high wear-resistance is in accordance with the high ductility of the films, the good modulus match in the films-substrate system, and the high hardness-to-modulus ratio of the films. The nano-indentation response, the film-substrate adhesion behaviors and the tribological properties are in accordance and can be ascribed to the high activity of the nanocrystalline Ti substrate

• Periodical: Materials Science Forum (Volumes 610-613)
• Pages: 1026-1033
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.610-613.1026
• Online since: January 2009
• Authors: Xiao Jing Xu, H. Wang, Xiao Nong Cheng
• Keywords: Friction, Magnetron Sputtering, Nanoindentation, Substrate Nanocrystallization, Thin Film, Wear

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