Abstract
In the case of oil lubrication with low sliding speed under high load, the hydrodynamic lubrication barely occurs, causing the slid contacts between mating surfaces. This increases the friction and the wear of the sliding surfaces. To protect the surfaces in such severe conditions, carbonaceous hard coatings such as diamondlike carbon (DLC) or carbon nitride (CNx) coatings is well-known with their low friction and anti-wear properties. However, it is also known that those coatings are severely damaged due to the small particles generated by wear. Therefore, we proposed the CNx coatings with microgrooves to reject those wear debris. In this paper, we discussed the effect of microgrooves on the friction properties of CNx coating under oil lubrication with small particles.
