Effect of Sliding Speed on Adhesive Wear Performance of Ceramic Coatings with Oxide Content
Mustafa Sabri Gök Y. Kucuk Mecit Oge
AbstractIn this study, a comparative examination of the effect of sliding speed, as a ball-on-disc sliding wear test parameter, was investigated under aqueous conditions. For this purpose, AISI 420 stainless steel specimens were prepared in cylindrical form (Ø25x8 mm), then they were coated with commercially available ceramic coatings (Cr2O3 and Al2O3) using APS technique. Adhesive wear tests were carried out by the use of a ball-on-disc testing rig. The tests were performed under 7N load, 0.08 m/s and 0.12 m/s sliding speeds. After the wear tests, worn samples were subjected to SEM analysis and profilometer measurements. The effect of sliding speed on wear performance of ceramic coatings was evaluated based on the analysis and measurement results. SEM images of Al2O3 coating indicate that, increasing sliding speed also increased the effect of plastic deformation, further inducing tribological layer formation. SEM images of Cr2O3 coating surface, on the other hand, indicated no significant effect of sliding speed at macro or micro level, which is mainly attributed to the higher hardness of Cr2O3 coating than Al2O3 coating. Friction coefficient graphs of both coatings indicated no significant change at both sliding speeds.