Molybdenum disulfide(MoS_(2))is widely utilized as alubricant in aerospace,machinery,and electronics applicationsbecause of its unique layered structure and interlayer slipcharacteristics.Understanding the tribologica...Molybdenum disulfide(MoS_(2))is widely utilized as alubricant in aerospace,machinery,and electronics applicationsbecause of its unique layered structure and interlayer slipcharacteristics.Understanding the tribological behavior of MoS_(2)-basedfilms under various atmospheric conditions,including oxidizing andspecialized atmospheres,is crucial for developing environmentallyadaptive lubricants.Here,we fabricated pure MoS_(2)and Ag-dopedMoS_(2)/Ag composite films via magnetron sputtering,focusing on theirtribological performance in argon,CO_(2),and O_(2)atmospheres.Ourresults demonstrate that the friction coefficients of both films in argonand CO_(2)are comparable to those in vacuum,with these environmentspromoting the formation of a continuous tribofilm on the counterpartball surface,thereby reducing the wear rates.Remarkably,in an oxygen environment,the MoS_(2)/Ag composite film results in a~50%reduction in the friction coefficient(0.027)and a threefold decrease in the wear rate compared with vacuum conditions.Thisexceptional performance is attributed to the friction-induced metal oxide nanoparticles coated with Ag,which form a“brick‒mud”structure that slides with MoS_(2)(002)nanosheets to achieve low friction and wear.Furthermore,the addition of Ag enhances theability of the film to repair sliding interfaces,mitigating abrasive wear.Our study elucidates the mechanisms driving the low-frictionbehavior of MoS_(2)-based films in atmospheric environments,offering valuable insights for the development of high-performancelubricants for extreme conditions.展开更多
基金supported by the National Natural Science Foundation of China(No.52375220)the National Key R&D Program of China(No.2022YFB3402800)+2 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Nos.XDB047030202 and XDB1210202)the Zhejiang Provincial Key Research and Development Program of China(No.2024C01159)the Natural Science Foundation of Ningbo(No.2024QL021).
文摘Molybdenum disulfide(MoS_(2))is widely utilized as alubricant in aerospace,machinery,and electronics applicationsbecause of its unique layered structure and interlayer slipcharacteristics.Understanding the tribological behavior of MoS_(2)-basedfilms under various atmospheric conditions,including oxidizing andspecialized atmospheres,is crucial for developing environmentallyadaptive lubricants.Here,we fabricated pure MoS_(2)and Ag-dopedMoS_(2)/Ag composite films via magnetron sputtering,focusing on theirtribological performance in argon,CO_(2),and O_(2)atmospheres.Ourresults demonstrate that the friction coefficients of both films in argonand CO_(2)are comparable to those in vacuum,with these environmentspromoting the formation of a continuous tribofilm on the counterpartball surface,thereby reducing the wear rates.Remarkably,in an oxygen environment,the MoS_(2)/Ag composite film results in a~50%reduction in the friction coefficient(0.027)and a threefold decrease in the wear rate compared with vacuum conditions.Thisexceptional performance is attributed to the friction-induced metal oxide nanoparticles coated with Ag,which form a“brick‒mud”structure that slides with MoS_(2)(002)nanosheets to achieve low friction and wear.Furthermore,the addition of Ag enhances theability of the film to repair sliding interfaces,mitigating abrasive wear.Our study elucidates the mechanisms driving the low-frictionbehavior of MoS_(2)-based films in atmospheric environments,offering valuable insights for the development of high-performancelubricants for extreme conditions.
