Spherical nano-MoS_(2)(S-MoS_(2))has excellent lubricating properties and potential application value in engine oil additives.Engine soot can enter the engine oil,so the tribological interaction between S-MoS_(2)and d...Spherical nano-MoS_(2)(S-MoS_(2))has excellent lubricating properties and potential application value in engine oil additives.Engine soot can enter the engine oil,so the tribological interaction between S-MoS_(2)and diesel combustion soot(DCS)should be investigated.In this study,DCS was used to simulate engine soot.The interaction was investigated in dioctyl sebacate(DOS),and the interaction mechanism was full characterized.Results showed that S-MoS_(2)and DCS had obvious antagonism effects on lubrication.The 0.5%S-MoS_(2)exhibited good lubricating properties in DOS,which could reduce friction by~22%and wear by~54%.However,after 0.5%S-MoS_(2)was added to the 0.5%DCS contaminated DOS,the lubrication performance was not improved and was even worse than that without S-MoS_(2).When S-MoS_(2)was added for DOS lubrication,a tribofilm containing MoS_(2)formed on the friction surface,but simultaneously adding 0.5%DCS resulted in the disappearance of the MoS_(2)tribofilm.Moreover,under the action of friction heat,DCS and S-MoS_(2)could form hard Mo_(x)C_(y),thereby increasing abrasive wear.Finally,a preliminary deantagonism method was provided.After 2.0%zinc isooctyl dithiophosphate was added to the above antagonistic system,the friction coefficient did not show visible changes,but the wear recovered to a level close to that when only S-MoS_(2)was added.The antiantagonism method is not very satisfactory and some more efficient methods need to be further explored.展开更多
基金supported by the National Natural Science Foundation of China(No.52075144)the Natural Science Foundation for Colleges and Universities in Anhui Province(No.2022AH010096).
文摘Spherical nano-MoS_(2)(S-MoS_(2))has excellent lubricating properties and potential application value in engine oil additives.Engine soot can enter the engine oil,so the tribological interaction between S-MoS_(2)and diesel combustion soot(DCS)should be investigated.In this study,DCS was used to simulate engine soot.The interaction was investigated in dioctyl sebacate(DOS),and the interaction mechanism was full characterized.Results showed that S-MoS_(2)and DCS had obvious antagonism effects on lubrication.The 0.5%S-MoS_(2)exhibited good lubricating properties in DOS,which could reduce friction by~22%and wear by~54%.However,after 0.5%S-MoS_(2)was added to the 0.5%DCS contaminated DOS,the lubrication performance was not improved and was even worse than that without S-MoS_(2).When S-MoS_(2)was added for DOS lubrication,a tribofilm containing MoS_(2)formed on the friction surface,but simultaneously adding 0.5%DCS resulted in the disappearance of the MoS_(2)tribofilm.Moreover,under the action of friction heat,DCS and S-MoS_(2)could form hard Mo_(x)C_(y),thereby increasing abrasive wear.Finally,a preliminary deantagonism method was provided.After 2.0%zinc isooctyl dithiophosphate was added to the above antagonistic system,the friction coefficient did not show visible changes,but the wear recovered to a level close to that when only S-MoS_(2)was added.The antiantagonism method is not very satisfactory and some more efficient methods need to be further explored.
