Tribological properties and releasing behavior of solid lubricant WS2 in the dimples on cylinder liner surface of diesel engine

Modified WS 2 by silane coupling agent were encapsulated in the dimples fabricated on the surface of cylinder liner samples by hot-pressing method. The tribological properties, anti-adhesion performance of the samples as well as the releasing behavior of modified WS 2 in the dimples were tested by a reciprocating tribotester. Moreover, the anti-erosion performance of modified WS 2 was examined by ultrasonic vibration test. The results indicate that the composite lubrication structure has good anti-friction and anti-adhesion effects. Furthermore, the release rate of WS 2 in the dimples is decreased by 102.2% due to the introduction of silane coupling agent . Additionally, the synergistic effect among the dimples, the solid lubricant and the silane coupling agent can explain the anti-friction and sustained release mechanisms.