Combined effect of WS_(2) and Ti_(3)C_(2)T_(x) MXene favors oil-based ultra-low friction on rough steel-steel interface at elevated temperatures  

作　　者：LIU YangQin CHEN Lei WANG Yang QIAN LinMao 

机构地区：[1]Tribology Research Institute,State Key Laboratory of Rail Transit Vehicle System,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China [2]Key Laboratory of Advanced Technologies of Materials(Ministry of Education),Research Institute of Frontier Science,Southwest Jiaotong University,Chengdu 610031,China

出　　处：《Science China(Technological Sciences)》2024年第7期1991-2002,共12页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 52122507, 52350411, 52235004, and 52305214);the Sichuan Science and Technology Program (Grant Nos. 2023NSFSC1988, 2023YFSY0004);the Fundamental Research Funds for the Central Universities (Grant No. 2682021ZTPY095);the Independent Project of State Key Laboratory of Rail Transit Vehicle System (Grant No. 2023TPLT04)。

摘　　要：The lubrication performance of liquids is severely restricted and is degraded in high-temperature environments. Stable and reliable lubrication in high temperature environments has been a long-standing goal in various industrial fields. In this study,WS_(2)and Ti_(3)C_(2)T_(x)MXene nanoflakes were used as oil-based lubricant additives to generate ultra-low friction and even superlubricity(friction coefficient of ~0.007) at elevated temperatures(400℃), which has hitherto not been achieved by both individual pristine materials, WS_(2)and Ti_(3)C_(2)T_(x)MXene. Viscosity and thermogravimetric characterization revealed improvements in the high-temperature rheological properties and thermal stability of the lubricating base oil, indicating improved loadbearing and continuous lubrication capabilities at elevated temperatures. X-ray photoelectron spectroscopy, transmission electron microscopy, and atomic force microscopy demonstrated that the formation of an iron/titanium/tungsten-rich oxide lubricious thin film at the sliding interface reduced the interfacial shear stress, which was responsible for the observed friction and wear reductions at high contact pressures(> 1.1 GPa). Although the titanium/tungsten oxide film was gradually removed after prolonged sliding, a sufficiently thick iron oxide film maintained a low friction coefficient for at least 2 h. The improved surface quality facilitates the achievement of ultra-low friction and reduced wear. The proposed lubrication methodology has a broad utilization potential as a wear-reduction strategy across various industrial fields at elevated temperatures.

关 键 词：ultra-low friction high-temperature wear reduction lubricating additive tungsten disulfide MXene 

分 类 号：TH117.1[机械工程—机械设计及理论]