Wang Binbin, Zhong Zhaodong, Qiu Han, Chen Dexin, Li Wei, Li Shuangjian, Tu Xiaohui
Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou 510000, China.
Nanomaterials (Basel). 2020 May 9;10(5):922. doi: 10.3390/nano10050922.
Natural serpentine powders are applicable as additives for various lubricating oils. However, no uniform theories explain their tribological performance, lubrication, and wear mechanism, especially their self-repairing mechanism. Herein, the influence of different nano serpentine powders (NSPs) contents in liquid paraffin on the friction and wear characteristics of steel balls and the self-repairing process of NSPs on the worn surface were studied. Results show that the optimal amount of NSPs was 0.5 wt %. Relative to those of the base oil, the friction coefficients and wear spot diameters were reduced by 22.8% and 34.2%, respectively. Moreover, the long-term tribological test shows that the wear scar diameter decreased slightly after 3 h, reaching the state of dynamic balance between wear and repair. The outstanding tribological performance should be attributed to the formed bilayer tribofilm, the first layer of which contains nanoparticles surrounded by lubricants and the second layer of which contains nanoparticles compacted onto the surface of the steel ball.
天然蛇纹石粉末可用作各种润滑油的添加剂。然而，尚无统一的理论来解释它们的摩擦学性能、润滑和磨损机制，尤其是它们的自修复机制。在此，研究了液体石蜡中不同含量的纳米蛇纹石粉末（NSPs）对钢球摩擦磨损特性的影响以及NSPs在磨损表面的自修复过程。结果表明，NSPs的最佳含量为0.5 wt%。相对于基础油，摩擦系数和磨损斑直径分别降低了22.8%和34.2%。此外，长期摩擦学试验表明，磨损斑直径在3小时后略有减小，达到磨损与修复的动态平衡状态。优异的摩擦学性能应归因于形成的双层摩擦膜，其第一层包含被润滑剂包围的纳米颗粒，第二层包含压实到钢球表面的纳米颗粒。
