Chen Shuqing, Ding Qi, Gu Yan, Quan Xin, Ma Ying, Jia Yulong, Xie Hongmei, Tang Jinzhu
College of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Nanomaterials (Basel). 2021 Dec 31;12(1):139. doi: 10.3390/nano12010139.
The tribological performances of fullerenol and nanodiamonds (NDs) as additives in water-based lubricants for amorphous carbon (a-C) coatings are investigated to avoid disadvantage factors, such as chemical reactions and deformation of particles. The effects of size and additive amount on tribological properties of nanoparticles are studied by rigid nanoparticles within the dot size range. The results show that owing to its small particle size (1-2 nm), fullerenol cannot prevent direct contact of the friction pair at low concentration conditions. Only when the quantity of fullerenol increased to support the asperity contact loads in sufficient concentration did nano-bearings perform well in anti-friction and anti-wear effects. Unlike fullerenol, nanodiamond particles with a diameter of about 5-10 nm show friction-reducing effect based on the nano-bearing effects at ultra-low concentration (0.01 wt.%), whereas particles at higher concentration block the rolling movement, hence increasing the coefficient of friction (COF) and wear. As a result of the effect of difference in size, fullerenol provides a better overall lubrication, but it is hard to reach a friction coefficient as low as NDs even under the optimal conditions.
研究了富勒醇和纳米金刚石（NDs）作为添加剂在用于非晶碳（a-C）涂层的水基润滑剂中的摩擦学性能，以避免诸如颗粒的化学反应和变形等不利因素。通过点尺寸范围内的刚性纳米颗粒研究了尺寸和添加量对纳米颗粒摩擦学性能的影响。结果表明，由于富勒醇粒径小（1-2纳米），在低浓度条件下它无法防止摩擦副的直接接触。只有当富勒醇的量增加到足以在足够浓度下支撑粗糙接触载荷时，纳米轴承才在减摩和抗磨效果方面表现良好。与富勒醇不同，直径约5-10纳米的纳米金刚石颗粒在超低浓度（0.01重量%）下基于纳米轴承效应显示出减摩效果，而较高浓度的颗粒会阻碍滚动运动，从而增加摩擦系数（COF）和磨损。由于尺寸差异的影响，富勒醇提供了更好的整体润滑，但即使在最佳条件下也难以达到与纳米金刚石一样低的摩擦系数。
