School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
National Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China.
Nano Lett. 2021 Jun 23;21(12):5308-5315. doi: 10.1021/acs.nanolett.1c01437. Epub 2021 Jun 2.
Friction and wear are the main reasons for decreasing the lifetime of moving mechanical components and causing energy loss. It is desirable to achieve macroscale superlubricity on industrial materials for minimizing friction. Herein, the two-dimensional material black phosphorus (BP) is prepared as an oil-based nanoadditive in oleic acid (OA) and shown to produce macroscale superlubricity at the steel/steel contact under high pressure. Experiments and molecular dynamics simulation reveal that BP quickly captures the carboxylic group and, as a result of the high contact pressure and heat, OA decomposes to release passivating species and recombines to form amorphous carbon giving rise to a composite solid tribofilm with BP. The OA and passivating groups adsorb onto the solid tribofilm to produce the passivating layer, thus resulting in macroscale superlubricity. The findings provide fundamental insight into the nature of tribochemical mechanisms and suggest a new approach to achieve macroscale superlubricity of industrial materials.
摩擦和磨损是降低运动机械部件寿命和导致能量损失的主要原因。在工业材料上实现宏观超润滑以最小化摩擦是很理想的。在此，二维材料黑磷（BP）被制备为油酸（OA）中的油基纳米添加剂，并在高压下的钢/钢接触中显示出产生宏观超润滑的效果。实验和分子动力学模拟表明，BP 迅速捕获羧酸基团，由于高接触压力和热量，OA 分解释放钝化物质并重新组合形成无定形碳，从而在 BP 上形成具有复合固体摩擦膜。OA 和钝化基团吸附在固体摩擦膜上以产生钝化层，从而产生宏观超润滑。这些发现提供了对摩擦化学机制本质的基本认识，并为实现工业材料的宏观超润滑提供了一种新方法。
