Molybdenum disulfide(MoS2)is widely utilized as alubricant in aerospace,machinery,and electronics applicationsbecause of its unique layered structure and interlayer slipcharacteristics.Understanding the tribologica...Molybdenum disulfide(MoS2)is widely utilized as alubricant in aerospace,machinery,and electronics applicationsbecause of its unique layered structure and interlayer slipcharacteristics.Understanding the tribological behavior of MoS2-basedfilms under various atmospheric conditions,including oxidizing andspecialized atmospheres,is crucial for developing environmentallyadaptive lubricants.Here,we fabricated pure MoS2and Ag-dopedMoS2/Ag composite films via magnetron sputtering,focusing on theirtribological performance in argon,CO2,and O2atmospheres.Ourresults demonstrate that the friction coefficients of both films in argonand CO2are 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 MoS2/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 MoS2(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 MoS2-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).
摘要Molybdenum disulfide(MoS2)is widely utilized as alubricant in aerospace,machinery,and electronics applicationsbecause of its unique layered structure and interlayer slipcharacteristics.Understanding the tribological behavior of MoS2-basedfilms under various atmospheric conditions,including oxidizing andspecialized atmospheres,is crucial for developing environmentallyadaptive lubricants.Here,we fabricated pure MoS2and Ag-dopedMoS2/Ag composite films via magnetron sputtering,focusing on theirtribological performance in argon,CO2,and O2atmospheres.Ourresults demonstrate that the friction coefficients of both films in argonand CO2are 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 MoS2/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 MoS2(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 MoS2-based films in atmospheric environments,offering valuable insights for the development of high-performancelubricants for extreme conditions.