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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >Nanoscale Surface Rheology in Tribology
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Nanoscale Surface Rheology in Tribology

机译：摩擦学中的纳米级表面流变学

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In order to increase the lifetime of contacts, tribologists need to quantify the basic properties of the lubricant and the surfaces it is separating. Previously, the bulk properties of these materials (lubricant and solids) were sufficient. In most lubrication processes (metalforming, valve train, bearings, ...), this is no longer true and knowledge of mechanical properties is required on a scale which is small or comparable with the film thickness. Nowadays, this means a scale in the range 10~(-9)-10~(-7) m. With the recent developments in the surface force techniques towards the simultaneous measurements of normal and tangential forces, it is now possible to evaluate, at a molecular scale, the mechanical properties of a sliding interface. These latter are one of the key parameters for the understanding of the friction and wear processes, especially in boundary lubrication. In this paper, the relationship between the visco-elastic properties of confined lubricating films and their tribological properties is shown, for a wide variety of boundary layers, from liquid-like to solid-like films. The role of contact pressure (using different contact geometries) and sliding speed is also discussed. For liquid or liquid-like lubricants (dilute polymers, oils, fatty acids,...) sheared in a low pressure sphere/plane contact ( < 0.1 GPa), the measurement of mechanical impedance of the interface gives both the shear elastic modulus as a function of the contact pressure and the degree of anisotropy of the layers in relation with their frictional behaviour. This approach can be extended to the high pressure domain ( > 0.1 GPa) that concerns numerous wear problems, by using a tip/plane contact which allows measurements of the rheological properties of small volumes of matter (few μm~3). The example of an anti-wear ZDTP films is presented, for which wear resistance is related to their ability to accommodate contact pressure. These various examples show the interest of analysing very thin film rheology in order to predict the basic tribological nanometer scale processes for the improvement of lubricant performances.
机译：为了延长接触器的寿命，摩擦学家需要量化润滑剂及其分离表面的基本性能。以前，这些材料（润滑剂和固体）的整体性能是足够的。在大多数润滑过程（金属成型，气门机构，轴承等）中，这不再是正确的，并且需要了解机械性能的尺度，该尺度应很小或与薄膜厚度相当。如今，这意味着规模在10〜（-9）-10〜（-7）m范围内。随着表面力技术在同时测量法向力和切向力方面的最新发展，现在可以在分子尺度上评估滑动界面的机械性能。后者是理解摩擦和磨损过程（尤其是边界润滑）的关键参数之一。在本文中，对于从液体状到固体状的各种边界层，都显示了密闭润滑膜的粘弹性与摩擦学性能之间的关系。还讨论了接触压力（使用不同的接触几何形状）和滑动速度的作用。对于在低压球体/平面接触（<0.1 GPa）中剪切的液体或液体状润滑剂（稀聚合物，油，脂肪酸等），界面机械阻抗的测量得出剪切弹性模量为接触压力和各层的各向异性程度与其摩擦性能的关系。通过使用尖端/平面接触，该方法可以扩展到涉及许多磨损问题的高压域（> 0.1 GPa），该尖端/平面接触可以测量小体积物质（几μm〜3）的流变性。给出了ZDTP耐磨膜的示例，其耐磨性与其承受接触压力的能力有关。这些不同的例子表明了分析非常薄的薄膜流变学的兴趣，以便预测改善润滑性能的基本摩擦学纳米级工艺。

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