Self-lubrication mechanism of Ni-Cr-Mo-S alloy

The selflubricating mechanism of a NiCrMoS alloy was studied. The results show that the microstructure of materials is made up of metallic matrix and sulfide eutectics or their combinations. The eutectics can be softened or melted to form selflubrication transferring film under the effects of temperature on the wear surfaces. MoO3 and NiO will join in the lubrication process at experimental high temperature.With increasing temperature, the lubrication effect of MoO3 decreases while that of NiO increases. The dominant wear type is slight slipsticking abrasivion at room temperature and particle abrasivion mixed with oxidation wear during hightemperature friction process.