Experimental modelling of surface roughness and dynamic friction coefficient of diamond like carbon coated shafts
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Companies that coat their products with DLC often have strict surface roughness and friction coefficient goals. This research investigates the surface roughness and friction coefficient properties of uncoated and DLC coated specimens in an effort to satisfy two particular requirements of the industry. The first requirement is to know what uncoated surface roughness is needed to obtain a certain DLC coated surface roughness. Therefore, a model describing the relationship between uncoated and DLC coated surface roughness is needed. If this relationship can be estimated, the cost of surface finishing can be minimized by avoiding any unnecessary processes. The second requirement is to know what uncoated surface roughness is needed to reach a specific friction coefficient after the DLC coating process. Therefore, a model describing the relationship between uncoated surface roughness and DLC coated friction coefficient is needed. This will also help minimize surface finishing costs. This research focuses on DLC coating of steel. A total of 7, 1045 steel specimens were tested before and after coating process with a non-contact surface roughness measurement microscope and a specifically designed and built friction measurement machine. An experimental methodology was described for applying the findings to other coating methods and materials as the mathematical relationships found in this study are specific to the coating process and materials used.