Abstract:For the marine diesel engine lubricants may be subject to particle pollution factors,three kinds of solid particles of copper,iron and silicon were selected to study the antiwear performance of lubricating oil under the influence of different particle size pollutants.The friction and wear properties of lubricating oil were evaluated by fourball friction and wear tester.The surface wear scar and surface wear morphology of steel ball were analyzed by microscope and online ferrography to explore the impact of particle contaminant the wear resistance of lubricating oil.The results show that the effect of different pollutants on the wear resistance of lubricating oil is obviously different.The iron particles under low concentration in the lubricating oil can reduce the wear and tear,however,when the concentration of iron particles reaches a certain value,a abrupt change of lubricating oil performance happens and its wear resistance becomes worse.Soft copper particles under low concentration has very small influence on the wear resistance of lubricating oil,while when the concentration of soft copper particles reaches a certain value,the wear resistance of lubricating oil is deteriorated.High hardness of silicon particles have significant cutting effect and will result in direct cracking of lubricating oil film and increase the wear and tear of steel ball.