The mechanical components’ friction and wear are the main factors to reduce the lifetime and cause the energy loss of machine. In this work, the alkyl-functionalized black phosphorus (BP) nanosheets were synthetized and used as lubricating additives in poly alpha olefins (PAO), which could trigger macroscale superlubricity on the silicon doped diamond-like carbon (Si-DLC) film deposited on the engineering steel surfaces. The COF of the PAO with the alkyl-functionalized BP additives could reduce down to 0.006, which reduced by more than 90% in comparison to that in the absence of functionalized BP. It shows that the high contact pressure and shear action in the running-in process make PAO and functionalized BP recombine to form a composite tribofilm. This composite tribofilm mainly contained the phosphorus oxides and silicon oxides, providing an extremely low shear strength and thereby resulting in a superlubricity state. These findings provide a novel method to achieve oil-based superlubricity on the engineering steel surfaces through the synergistic lubrication effect between the BP and Si-DLC.

机械部件的摩擦磨损是降低机器寿命和造成机器能量损失的主要因素。在这项工作中，烷基功能化的黑磷（BP）纳米片被合成并用作聚α烯烃（PAO）中的润滑添加剂，这可以触发沉积在硅掺杂类金刚石碳（Si-DLC）薄膜上的宏观超润滑性。工程钢表面。加入烷基官能化 BP 添加剂的 PAO 的 COF 可降低至 0.006，与不含官能化 BP 的情况相比降低了 90% 以上。这表明磨合过程中的高接触压力和剪切作用使PAO和功能化的BP复合形成复合摩擦膜。这种复合摩擦膜主要含有磷氧化物和硅氧化物，提供极低的剪切强度，从而导致超润滑状态。这些发现提供了一种通过BP和Si-DLC之间的协同润滑作用在工程钢表面上实现油基超润滑性的新方法。