Abstract—

The aim of this study is an experimental-based analysis of the effect of surface treatment, leading to the formation of carbonized layers, on the coefficient of sliding friction of two polyurethane materials that differ in mechanical and rheological properties. The properties were determined by the results of indentation on a NanoScan-4D scanning nanohardness tester. A ceramic ball with a diameter of 2.1 mm was used as an indenter, which was pressed into the samples at a given linear velocity. The indentation curves at low and high indentation velocities were used to calculate the longitudinal and instantaneous reduced modulus of elasticity. It was found that the longitudinal elastic moduli differ by more than seven times, and the rheological properties of a more rigid material are weak. Tribological tests were performed on a UMT-3 friction machine in the mode of unidirectional sliding friction at a constant load and velocity. Based on the data, regression equations were calculated and the dependences of the friction coefficient on the load and sliding velocity were obtained. The influence of the surface treatment fluence on the surface roughness, adhesion, and deformation friction force is analyzed, data are correlated with the known experimental and theoretical results. It is shown that surface treatment with a relatively small fluence gives fundamentally different effects for the two studied materials: a slight change in roughness and decrease of friction coefficient for the more rigid polyurethane; a significant increase in roughness and a consistently high coefficient of friction, which varies slightly in the considered ranges of loads and velocities. Thus, surface treatment can be used for controlling the coefficient of friction of polyurethane and ensuring its consistently high frictional properties.

中文翻译：

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离子等离子体表面处理对聚氨酯摩擦学特性的影响

摘要-

本研究的目的是通过实验分析导致碳化层形成的表面处理对两种机械和流变性能不同的聚氨酯材料的滑动摩擦系数的影响。通过NanoScan-4D扫描纳米硬度计压痕结果确定其性能。使用直径为 2.1 mm 的陶瓷球作为压头，以给定的线速度压入样品。低压痕速度和高压痕速度下的压痕曲线用于计算纵向和瞬时减少弹性模量。结果发现，纵向弹性模量相差七倍以上，而且刚性较大的材料的流变性能较弱。在 UMT-3 摩擦机上以恒定载荷和速度的单向滑动摩擦模式进行摩擦学测试。根据这些数据，计算回归方程，得到摩擦系数对载荷和滑动速度的依赖关系。分析了表面处理注量对表面粗糙度、附着力和变形摩擦力的影响，并将数据与已知的实验和理论结果相关联。结果表明，相对较小注量的表面处理对两种研究材料产生了根本不同的效果：对于较硬的聚氨酯，粗糙度略有变化，摩擦系数降低；粗糙度显着增加，摩擦系数始终较高，在考虑的载荷和速度范围内略有变化。因此，表面处理可用于控制聚氨酯的摩擦系数并确保其始终如一的高摩擦性能。