Combined effect of WS2 and Ti3C2Tx MXene favors oil-based ultra-low friction on rough steel-steel interface at elevated temperatures

LIU YangQin ¹CHEN Lei ¹WANG Yang ²QIAN LinMao¹

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作者信息

1. Tribology Research Institute,State Key Laboratory of Rail Transit Vehicle System,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China
2. Tribology Research Institute,State Key Laboratory of Rail Transit Vehicle System,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of Advanced Technologies of Materials(Ministry of Education),Research Institute of Frontier Science,Southwest Jiaotong University,Chengdu 610031,China
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Abstract

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,WS2 and Ti3C2Tx MXene nanoflakes were used as oil-based lubricant additives to generate ultra-low friction and even super-lubricity(friction coefficient of～0.007)at elevated temperatures(400℃),which has hitherto not been achieved by both individual pristine materials,WS2 and Ti3C2Tx MXene.Viscosity and thermogravimetric characterization revealed improve-ments in the high-temperature rheological properties and thermal stability of the lubricating base oil,indicating improved load-bearing 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.

Key words

ultra-low friction/high-temperature/wear reduction/lubricating additive/tungsten disulfide/MXene

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基金项目

National Natural Science Foundation of China(Grant Nos.52122507)

National Natural Science Foundation of China(52350411)

National Natural Science Foundation of China(52235004)

National Natural Science Foundation of China(52305214)

Sichuan Science and Technology Program(Grant Nos.2023NSFSC1988)

Sichuan Science and Technology Program(2023YFSY0004)

Fundamental Research Funds for the Central Universities(2682021ZTPY095)

Independent Project of State Key Laboratory of Rail Transit Vehicle System(2023TPL-T04)

出版年

2024

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

参考文献量3

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