Surface and sub-micron sub-surface evolution of Al390-T6 undergoing tribological testing under submerged lubrication conditions in the presence of CO2 refrigerant

摘要: Carbon dioxide (CO2) with its environmental benefits is considered a good replacement for commonly used synthetic refrigerants. In this study, the surface and sub-surface changes in simulated CO2 environment during initial or transient stages of sliding contacting interface were investigated. Pin-on-disk configurations involving Al390-T6 disks contact 52100 steel pins controlled tribological experiments using High Pressure Tribometer. order to evaluate effectiveness refrigerant, comparative conventional refrigerant different lubricants initially performed step-increasing load manner under submerged lubricated conditions. Subsequent detailed investigating presence best performing lubricant, polyalkyline glycol. Burnishing was observed on surfaces (evolutionary) stage, which indicated asperity contacts due breaking elasto-hydrodynamic lubrication film. quantify sub-micron that occurred stage operation, several analytical tasks performed, involved measurements nanomechanical properties, chemical compositions topmost 200 nm layer, roughness. Such studies evolutionary tribopair shed light complex interactions between determine whether successful conditions will eventually be achieved. Based analyses presented work, it concluded viable from tribology point view.