Optimum Me-DLC coatings and hard coatings for tribological performance

In this study, hard coatings (TiN, TiCN, CrN, and CrCN) and Me-DLC coatings (Ti-x%-C:H and Cr-x%-C:H) were deposited on tungsten carbide (WC) substrat e by multiarc physical vapor deposition (MAPVD) and unbalanced magnetron (U BM) sputtering, respectively. Counterbodies of the AISI 1045 steel cylinder and the AA7075T651 aluminum cylinder were used in the cylinder-on-disk, li ne-contact wear mode under dry condition; a counterbody of the AISI 52100 s teel ball was used in the ball-on-disk, point-contact wear mode, under both dry and lubricated conditions. All wear tests were conducted with a recipr ocating machine. After the tests, the most suitable coating for various cou nterbodies and test environments was selected, For the coating/1045 steel c ylinder, the Ti-10%,-C:H coating possesses excellent tribological character istics. For the coating/7075T651 aluminum cylinder, hard coatings display e xcellent wear resistance. Far the coating/steel ball, CrCN and CrN coatings display very little wear under both dry and lubricated conditions. On TIN and TiCN coatings, special wear mechanisms of material transfer, adhesion w ear, and fatigue fracture occurred during initial tests under kerosene lubr ication.