Study on wear behavior of molybdenum-sprayed piston rings and nitrided cylinder liners using a simulated experimental method

As internal combustion engines advance toward higher power density and lower emissions, the reliability of piston ring-cylinder liner tribological pairs becomes increasingly critical. In this study, the wear behavior of a molybdenum-sprayed piston ring against a nitrided cylinder liner was investigated under varying sliding time, temperature, and load using a simulated wear test. Anti-scuffing performance was further evaluated by interrupting oil supply under severe conditions (40 MPa, 220 °C), where the pair sustained operation for an average of 110 min. The results provide insight into the tribological characteristics of this material pairing for high-performance engine applications.