An apparatus has been built in order to estimate the nanotribological properties of boundary films confined between two metal surfaces with practical roughness. A spherical specimen (SUJ2, diameter 5 mm) is held by a double-cantilever spring (stiffness: 7400 N/m) in a sample liquid, and a planar specimen (SUJ2) is moved toward it at constant speed (1 μm/s). After a running-in treatment, the displacements of the two specimens and the voltage between them are measured simultaneously, and the changes of film thickness, normal force, and electrical resistance are obtained in a series of measurements. Experimental results with systematic combinations of base oils (normal saturated hydrocarbons) and additives (normal saturated fatty acids) show that the chain-matching effect is not clearly observed in the effective viscosity of mobile layers, whereas the thickest immobile films are formed when the chain length of the base oil is coincident with that of an additive, indicating the importance of the interaction between base oils and additives in forming boundary films.
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机译：为了估计边界膜的纳米摩擦学性质，已经建立了一种装置，该边界膜具有实际粗糙度，限制在两个金属表面之间。球形试样（SUJ2，直径5 mm）由双悬臂弹簧（刚度：7400 N / m）保持在试样液中，平面试样（SUJ2）以恒定速度（1μm/ s）向其移动）。经过磨合处理后，同时测量两个试样的位移和它们之间的电压，并通过一系列测量获得膜厚度，法向力和电阻的变化。基础油（正常饱和烃）和添加剂（正常饱和脂肪酸）的系统组合的实验结果表明，在可移动层的有效粘度中并未清楚地观察到链匹配作用，而当链形成时，形成了最厚的不可移动膜基础油的长度与添加剂的长度一致，表明基础油与添加剂之间的相互作用在形成边界膜中的重要性。
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