Mechanical and high pressure tribological properties of nanocrystalline Ti(N,C) and amorphous C:H nanocomposite coatings
Tsotsos, C, Polychronopoulou, K, Demas, NG, Constantinides, G, Gravani, S, Böbel, K, Baker, MA, Polycarpou, AA and Rebholz, C (2010) Mechanical and high pressure tribological properties of nanocrystalline Ti(N,C) and amorphous C:H nanocomposite coatings Diamond and Related Materials, 19 (7-9). 960 - 963. ISSN 0925-9635
DIAMOND-S-09-00405.pdf - Accepted Version
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This paper reports on the mechanical and high pressure tribological properties of nanocrystalline (nc-) Ti(N,C)/amorphous (a-) C:H deposited, using low temperature (∼ 200 °C) DC reactive magnetron sputtering. The mechanical properties are affected by the nc-Ti(N,C)/a-C:H phase fraction ratio. For increasing C contents (from 31 to 47 at.%) an increase of the a-C:H phase content and a degradation of the nanocrystalline phase occurs leading to a reduction in nanoindentation hardness (H) values (from 15 to 9 GPa) and reduced modulus (Er) values (from 150 to 80 GPa). A strong correlation between H/E ratio and wear performance was exhibited by the coatings. The synthesized coatings survived up to 100 m sliding distance when tested using pin-on-disc sliding configuration at > 4.5 GPa contact pressures and the measured friction coefficient values were similar for all films (μ ∼ 0.21–0.25).
|Divisions:||Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences|
|Depositing User:||Symplectic Elements|
|Date Deposited:||17 Nov 2011 12:05|
|Last Modified:||23 Sep 2013 18:52|
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