Two-dimensional molybdenum carbide (MXene) as an efficient nanoadditive for achieving superlubricity under ultrahigh pressure
Two-dimensional molybdenum carbide (MXene) as an efficient nanoadditive for achieving superlubricity under ultrahigh pressure
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DOI：
10.1007/s40544-022-0597-6
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发表时间：
2022-04
期刊：
影响因子：
6.8
通讯作者：
Shuang Yi;Yitong Guo;Jinjin Li;Yuxin Zhang;Aiguo Zhou;Jianbin Luo
中科院分区：
文献类型：
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作者：
Shuang Yi;Yitong Guo;Jinjin Li;Yuxin Zhang;Aiguo Zhou;Jianbin Luo
在这项研究中，通过在Si 3 N4-蓝宝石界面处的六氟磷酸锂基离子液体中引入碳化钼（Mo 2CTx）MXene纳米颗粒作为润滑添加剂，实现了具有0.004的摩擦系数的稳健宏观尺度液体超润滑性。超润滑状态下的最大接触压力可达1.42GPa，远远超过了以往研究中超润滑状态的极限。结果表明，在摩擦副与基体的界面上，通过摩擦化学反应形成了以氧化钼和氧化磷为主的复合摩擦膜，从而提高了摩擦副的抗磨性能。此外，极低的剪切强度的摩擦膜和中间层的Mo 2CTxMXene有助于超润滑性。这项工作证明了Mo 2CTxMXene在改善超润滑性能方面的潜力，这将加速超润滑性在机械系统中的应用。
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 Mo2CTxMXene contributed to the superlubricity. This work demonstrates the promising potential of Mo2CTxMXene in improving superlubricity properties, which could accelerate the application of superlubricity in mechanical systems.