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Carbon coating of Ti-6Al-4V for reduced wear in combined impact and sliding applications |
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| Authors: | Naoki Fujisawa Michael V Swain Natalie L James John C Woodard Richard N Tarrant David R McKenzie |
| Affiliation: | a Biomaterials Science Research Unit, Faculties of Dentistry and Engineering, University of Sydney, Suite G11, National Innovation Centre, Australian Technology Park, Eveleigh, NSW 1430, Australia;b VentrAssist Division, Ventracor Ltd, 126 Greville Street, Chatswood, NSW 2067, Australia;c Department of Applied and Plasma Physics, School of Physics, University of Sydney, NSW 2006, Australia |
| Abstract: | A range of carbon coatings with different hardness and modulus was compared for wear and frictional behaviours using one-side-carbon-coated Ti-6Al-4V alloy couples tested under conditions of combined impact and sliding contact. Carbon films with hardness over 10 GPa were found to cause far greater volume loss of the uncoated counterpart, and the volume loss was approximately proportional to the extent of hardness deviation above 10 GPa. The coefficient of friction was shown to correlate positively with coating hardness. The tendency of a softer coating to possess a greater sp2 or graphite-like content provides more effective solid lubrication in a wet environment, hence minimising both wear and friction. The corresponding low film modulus also provides an optimal structural integrity of the composite system by minimising the elastic modulus mismatch between the film and the underlying substrate. |
| Keywords: | Carbon coatings Hardness Modulus Friction and wear Ti-6Al-4V alloy |
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