Mechanical and Tribological Behavior of Microcrystalline CVD Diamond Coatings
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Smooth and adhesive microcrystalline CVD diamond coatings have been acquired successfully on chemically etched titanium alloy (Ti6Al4V) substrates, using hot filament chemical vapor deposition technique. The mechanical and tribological characteristics of HFCVD microcrystalline diamond coatings on titanium alloy (Ti6Al4V) substrates are investigated in this research. SEM and Raman spectroscopy were used to study the morphology and quality of the coatings. The surface roughness has been determined by 3d profilometer measurements. A ball-on-disk tribometer was used to characterize the friction and wear of the coatings. The frictional behavior of the MCD coating was studied, when sliding against smooth alumina ball with increasing load (1–10 N). A coefficient of friction of ~ 0.3–0.287 was obtained at a sliding speed of 12 m/s. The wear of the diamond coating is negligible. The alumina balls are worn out quickly as compared to the diamond coatings. Nanoindentation tests were carried out using Berkovich nanoindenter, and the average super-hardness of MCD coatings was found to be 55 GPa.
KeywordsTitanium alloy Microcrystalline diamond coatings Wear rate Coefficient of friction
The authors would like to thank MSRC lab, IIT Madras, for the deposition of coatings and C. Anandan (Surface Engineering Division, NAL, Bangalore, India) for carrying out tribological tests.
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