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Research Article | Open Access

Two-dimensional molybdenum carbide (MXene) as an efficient nanoadditive for achieving superlubricity under ultrahigh pressure

Shuang YI1,2, Yitong GUO3, Jinjin LI1 (), Yuxin ZHANG2, Aiguo ZHOU3, Jianbin LUO1
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Henan Key Laboratory of Materials on Deep-Earth Engineering, Henan Polytechnic University, Jiaozuo 454003, China
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Abstract

In this study, a robust macroscale liquid superlubricity with a coefficient of friction of 0.004 was achieved by introducing molybdenum carbide (Mo2CTx) MXene nanoparticles as lubricating additives in a lithium hexafluorophosphate-based ionic liquid at Si3N4–sapphire interfaces. The maximal contact pressure in the superlubricity state could reach 1.42 GPa, which far exceeds the limit of the superlubricity regime in previous studies. The results indicate that a composite tribofilm (mainly containing molybdenum oxide and phosphorus oxide) that formed at the interface by a tribochemical reaction contributed to the excellent antiwear performance. Furthermore, the extremely low shear strength of the tribofilm and the interlayers of Mo2CTx MXene contributed to the superlubricity. This work demonstrates the promising potential of Mo2CTx MXene in improving superlubricity properties, which could accelerate the application of superlubricity in mechanical systems.

Keywords

molybdenum carbide (Mo2CTx) MXenesuperlubricityadditivesultrahigh pressurewear resistance

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Friction
Volume 11 Issue 3,
March 2023
Pages 369-382
DOI: 10.1007/s40544-022-0597-6
Cite this article:
YI S, GUO Y, LI J, et al. Two-dimensional molybdenum carbide (MXene) as an efficient nanoadditive for achieving superlubricity under ultrahigh pressure. Friction, 2023, 11(3): 369-382. https://doi.org/10.1007/s40544-022-0597-6
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