Two-dimensional (2D) materials have demonstrated unique friction and antiwear properties unmatched by their bulk (3D) counterparts. A relatively new, large and quickly growing family of two-dimensional early transition metal carbides and nitrides (MXenes) present a great potential in different applications. There is a growing interest in understanding the mechanical and tribological properties of MXenes, however, no report of MXene superlubricity in a solid lubrication process at the macroscale has been presented. Here we investigate the tribological properties of two-dimensional titanium carbide (Ti₃C₂) MXene deposited on SiO₂-coated silicon (Si) substrates subjected to wear by sliding against a diamond-like carbon (DLC)-coated steel ball counterbody using a ball-on-disc tribometer. We have observed that a reduction of the friction coefficient to the superlubric regime (0.0067 ± 0.0017) can be achieved with Ti₃C₂ MXene in dry nitrogen environment. Moreover, the addition of graphene to Ti₃C₂ further reduced the friction by 37.3% and wear by the factor of 2 as compared to Ti₃C₂ alone, while the superlubricity behavior of the MXene remains unchanged. These results open up new possibilities for exploring the family of MXenes in various tribological applications.

二维（2D）材料已显示出独特的摩擦和抗磨特性，这是其大体积（3D）同类产品所无法比拟的。相对较新的，大型且快速增长的二维早期过渡金属碳化物和氮化物（MXenes）系列在不同应用中具有巨大潜力。人们对理解MXene的机械和摩擦学性能的兴趣与日俱增，但是，目前还没有关于宏观上固体润滑过程中MXene超润滑性的报道。在这里，我们研究了沉积在SiO ₂上的二维碳化钛（Ti ₃ C ₂）MXene的摩擦学性能。圆盘摩擦计，通过在涂有金刚石的碳（DLC）涂层的钢制球对接体上滑动，使涂有碳的硅（Si）基板受到磨损。我们已经观察到，在干燥氮气环境下，使用Ti ₃ C ₂ MXene可以使摩擦系数降低至超润滑状态（0.0067±0.0017）。此外，添加到石墨烯的Ti ₃ c ^ ₂进一步由37.3％和磨损通过2因子作为与Ti相比减少了摩擦₃ Ç ₂单独，同时MXene的超润滑行为保持不变。这些结果为探索各种摩擦学应用中的MXene系列开辟了新的可能性。