Lubricant-surface system mitigating in-cylinder friction

新兴的现代轴承表面摩擦学方法是将接合处视为润滑表面系统。这与传统的非集成方法相反，传统方法根据其承载能力，剪切特性和添加剂包来确定润滑剂的流变性，以满足一般要求。就磨损特性、疲劳强度和设想的地形而言，表面制备也是如此，例如在涂层的制备、沉积方法、微观结构属性、涂层厚度、机械性能和地形测量方面。然而，最近的详细研究清楚地表明，润滑剂分子种类与表面形貌和物理力学性能之间的相互作用在超薄吸附膜的形成中起着关键作用，而超薄吸附膜在细微尺度上影响着润滑剂-表面系统的摩擦化学和粘附特性。这些特征被转化为微观尺度的摩擦观察，通过大量的不从根本上理解的现象，这些现象也受到操作条件的影响，如接触运动学，载荷和热力学。显然，系统动力学、摩擦学（跨尺度物理）和物理化学分子/原子相互作用的及时综合研究对于理解润滑油-表面系统的多尺度多物理性质是必要的。

The emerging modern approach to tribology of load bearing surfaces is to treat theconjunction as a lubricant-surface system. This is contrary to the traditional non-integrated approaches where lubricant rheology is determined according to its load carrying capacity, shear characteristics and an additive package to service a host of requirements in general terms. The same has also been true of surface preparation in terms of wear characteristics, fatigue strength and envisaged topography, for example in preparation of coatings, method of deposition, micro-structural attributes, coating layer thickness, mechanical properties and topographical measures.However, recent detailed studies clearly demonstrate that the interactions between the lubricant molecular species and surface topographical and physic-mechanical properties play keys in the formation of ultra-thin adsorbed films which affect the trib0-chemical and adhesive characteristics of the lubricant-surface system at the scale of minutiae. These characteristics are translated to micro-scale observation of friction, through a plethora of not fundamentally understood phenomena, which are also affected by operating conjunctional conditions such as contact kinematics,loading and thermodynamics.Clearly, a timely integrated combined study of system dynamics, tribology (across the physics of scale) and physical chemistry molecular/atomic interactions is necessary to understand the multi-scale multi-physics nature of the lubricant-surface system.