This study prepared four types of ionic liquid-modified polypyrrole(IL-modified PPy)as conductive additives and investigated their tribological performance and conductivity in polytetrafluoroethylene lubricating greas...This study prepared four types of ionic liquid-modified polypyrrole(IL-modified PPy)as conductive additives and investigated their tribological performance and conductivity in polytetrafluoroethylene lubricating grease.The results indicated that IL-modified PPy effectively enhanced the anti-wear performance and conductivity of the base grease.Among the additives,1-octyl-3-methylimidazolium tetrafluoroborate([OMIm][BF4])modified PPy showed superior performance compared to the other three additives,with the best effect observed at a mass fraction of 0.5%.X-ray photoelectron spectroscopy analysis revealed that IL-modified PPy forms a stable friction chemical film during the friction process,effectively enhancing the lubrication performance and conductivity of the base grease.This indicates broad potential applications in the field of conductive lubrication.展开更多
A new conductive grease was synthesized using a nanometer powder,i.e.,Sb doped SnO2(ATO),as an additive.The typical properties of this new conductive grease were investigated in detail.The results indicate that ATO ca...A new conductive grease was synthesized using a nanometer powder,i.e.,Sb doped SnO2(ATO),as an additive.The typical properties of this new conductive grease were investigated in detail.The results indicate that ATO can dramatically improve the dropping point and reduce contact resistance.The tribological properties of the new conductive grease were investigated using the MFT-R4000 reciprocating friction and wear tester.The tribol-test results indicate that ATO can dramatically improve the tribological properties of the grease.When the ATO concentration is 0.1wt%,the grease demonstrates the best friction reduction properties;when the concentration is 0.5wt%,the grease demonstrates the best anti-wear properties.The worn surfaces were observed and analyzed by scanning electron microscopy and energy-dispersive X-ray spectroscopy,and the friction mechanisms for the new conductive grease are proposed.The excellent tribological properties of the new conductive grease are attributed to the mechanical effect of ATO,and the film formed by Sn and Sb elements or metallic oxide deposited on worn surfaces during the friction process.展开更多
基金The authors would like to appreciate the financial support extended for this academic work by the Beijing Natural Science Foundation(Grants 2172053,2232066)the Open Project Foundation of State Key Laboratory of Solid Lubrication(Grant LSL-2212).
文摘This study prepared four types of ionic liquid-modified polypyrrole(IL-modified PPy)as conductive additives and investigated their tribological performance and conductivity in polytetrafluoroethylene lubricating grease.The results indicated that IL-modified PPy effectively enhanced the anti-wear performance and conductivity of the base grease.Among the additives,1-octyl-3-methylimidazolium tetrafluoroborate([OMIm][BF4])modified PPy showed superior performance compared to the other three additives,with the best effect observed at a mass fraction of 0.5%.X-ray photoelectron spectroscopy analysis revealed that IL-modified PPy forms a stable friction chemical film during the friction process,effectively enhancing the lubrication performance and conductivity of the base grease.This indicates broad potential applications in the field of conductive lubrication.
基金supported by Hundreds Talent Program of Chinese Academy of Science.
文摘A new conductive grease was synthesized using a nanometer powder,i.e.,Sb doped SnO2(ATO),as an additive.The typical properties of this new conductive grease were investigated in detail.The results indicate that ATO can dramatically improve the dropping point and reduce contact resistance.The tribological properties of the new conductive grease were investigated using the MFT-R4000 reciprocating friction and wear tester.The tribol-test results indicate that ATO can dramatically improve the tribological properties of the grease.When the ATO concentration is 0.1wt%,the grease demonstrates the best friction reduction properties;when the concentration is 0.5wt%,the grease demonstrates the best anti-wear properties.The worn surfaces were observed and analyzed by scanning electron microscopy and energy-dispersive X-ray spectroscopy,and the friction mechanisms for the new conductive grease are proposed.The excellent tribological properties of the new conductive grease are attributed to the mechanical effect of ATO,and the film formed by Sn and Sb elements or metallic oxide deposited on worn surfaces during the friction process.
