Alkyl-functionalized Black Phosphorus Nanosheets Triggers Macroscale Superlubricity on Diamond-like Carbon Film
Alkyl-functionalized Black Phosphorus Nanosheets Triggers Macroscale Superlubricity on Diamond-like Carbon Film
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DOI：
10.1016/j.cej.2022.137764
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发表时间：
2022-06
影响因子：
15.1
通讯作者：
Shuang Yi;Jinjin Li;Jinsong Rao;X. Ma;Yuxin Zhang
中科院分区：
文献类型：
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作者：
Shuang Yi;Jinjin Li;Jinsong Rao;X. Ma;Yuxin Zhang
机械零部件的摩擦磨损是降低机械寿命和造成能量损失的主要因素。合成了烷基官能化的黑磷（BP）纳米片，并将其作为聚α烯烃（PAO）的润滑添加剂，在工程钢表面沉积硅掺杂类金刚石碳（Si-DLC）膜，引发宏观超润滑作用。加入烷基官能化BP后，PAO的COF值可降至0.006，比未加入官能化BP时降低了90%以上。结果表明，在磨合过程中，高接触压力和剪切作用使PAO与功能化BP复合形成复合摩擦膜。该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之间的协同润滑效应在工程钢表面实现油基超润滑的新方法。
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.