Effects of thermo physical properties of crambe, linseed, and jojoba oils, a typical petroleum-based lubricant (PBL), and blends of crambe oil and PBL on their tribological performance were investigated. Biolubricants showed better lubricity (i,e., lower coefficient of friction). At 55 N load, linseed and jojoba oils had the lowest and PBL had the highest wear. At 90 N and 160 N normal loads crambe and PBL and their blends demonstrated the lowest, and linseed and jojoba oils presented the highest wear. Crambe oil and PBL lubrication regimes start as elastohydrodynamic regime at low normal load and transform to mixed regime at higher normal loads, whereas Jojoba oil, linseed oil, and the blend sample of PBL and crambe oil follow mixed lubrication regime at low normal loads and convert to boundary lubrication regime as the normal load is increased. Further, results indicated that crambe oil with the lowest coefficient of friction and wear, high viscosity and viscosity index, and low pour point has a high potential for partial replacement of petroleum-based lubricants.
A comparative investigation on tribological performance and physicochemical properties of biolubricants of various sources, a petroleum-based-lubricant, and blends of the petroleum-based lubricant and crambe oil
Alessandro Ruggiero
2020-01-01
Abstract
Effects of thermo physical properties of crambe, linseed, and jojoba oils, a typical petroleum-based lubricant (PBL), and blends of crambe oil and PBL on their tribological performance were investigated. Biolubricants showed better lubricity (i,e., lower coefficient of friction). At 55 N load, linseed and jojoba oils had the lowest and PBL had the highest wear. At 90 N and 160 N normal loads crambe and PBL and their blends demonstrated the lowest, and linseed and jojoba oils presented the highest wear. Crambe oil and PBL lubrication regimes start as elastohydrodynamic regime at low normal load and transform to mixed regime at higher normal loads, whereas Jojoba oil, linseed oil, and the blend sample of PBL and crambe oil follow mixed lubrication regime at low normal loads and convert to boundary lubrication regime as the normal load is increased. Further, results indicated that crambe oil with the lowest coefficient of friction and wear, high viscosity and viscosity index, and low pour point has a high potential for partial replacement of petroleum-based lubricants.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
