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

Friction

Research Article

Yuxin Zhang¹  Yitong Guo²  Aiguo Zhou²  Jinjin Li³  Jianbin Luo³  Shuang Yi⁴ 

[1] College of Materials Science and Engineering, Chongqing University, 400044, Chongqing, China;Henan Key Laboratory of Materials on Deep-Earth Engineering, Henan Polytechnic University, 454003, Jiaozuo, China;State Key Laboratory of Tribology, Tsinghua University, 100084, Beijing, China;State Key Laboratory of Tribology, Tsinghua University, 100084, Beijing, China;College of Materials Science and Engineering, Chongqing University, 400044, Chongqing, China;

关键词: molybdenum carbide (MoCT) MXene;    superlubricity;    additives;    ultrahigh pressure;    wear resistance;   

DOI  :  10.1007/s40544-022-0597-6

 received in 2021-10-29, accepted in 2022-01-08,  发布年份 2022

来源: Springer

【 摘 要 】

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.

【 授权许可】

CC BY   
© The author(s) 2022

【 图 表 】

Fig. 2

Fig. 2