Tribological behavior of HVOF carbon coating for wear resistance applications

In the present work, author has successfully developed carbon coating for wear resistance applications using HVOF thermal spray process. The FESEM, OM and Raman spectra confirms the presence of sp¹, sp² and sp³ structured carbon phase in the carbon coating, having good mechanical properties (micro-hardness) and excellent tribological performance (COF and wear). The carbon coating was tested at variable temperature (30, 100, 200, 300, 400 °C). It was seen that, the micro-hardness of coating increases with temperature, due to formation of oxides and carbide layer in the coating. The experimental result of wear shows that carbon coating was temperature dependent and at 400 °C lowest COF (0.045), frictional force (0.9 N) and wear (12 μm) were obtained for carbon coating. (paper)