Abstract

Surface texture is a valid way of improving hydrodynamic lubrication performance and reducing friction. In this work, a novel micro-additive manufacturing technique, selective laser melting ink-printed (SLM-IP) copper (Cu) nanoparticles (NPs) method, was developed to fabricate Cu protruded microtextures on stainless steel surface. The physical effects of texture geometry parameters on the hydrodynamic lubrication performance were investigated by theoretical calculation and experiments. The theoretical results indicated that the triangle-shaped microtexture exhibited better hydrodynamic effects compared to circular and square-shaped ones. The use of a complicated ring structure resulted in a noticeable increase in hydrodynamic pressure. For each individual shape, the friction coefficient was measured and calculated as a function of texture area or radius ratio. The experimental results, supported by the theoretical analysis, provides evidence that the protruded surface microtexture fabricated by SLM-IP Cu NPs helped improve the tribological performance. The geometric parameters of the protruded microtexture’s size should be taken into account for the optimum size of texture structure. Furthermore, the operating condition of the protruded surface texture were evaluated. A transition point of sliding speed and load existed between mixed and hydrodynamic lubrication regimes. This study suggests that the SLM-IP Cu NPs method is a promising approach for friction reduction surface microtexture manufacturing.

摘要

表面纹理是提高流体动力润滑性能和减少摩擦的有效途径。在这项工作中，开发了一种新型微增材制造技术，即选择性激光熔融油墨印刷 (SLM-IP) 铜 (Cu) 纳米颗粒 (NPs) 方法，用于在不锈钢表面制造铜突出的微纹理。通过理论计算和实验研究了织构几何参数对流体动力润滑性能的物理影响。理论结果表明，与圆形和方形微纹理相比，三角形微纹理表现出更好的流体动力学效果。使用复杂的环结构导致流体动压显着增加。对于每个单独的形状，摩擦系数被测量并计算为纹理面积或半径比的函数。理论分析支持的实验结果提供了证据，证明由 SLM-IP Cu NPs 制造的突出表面微纹理有助于提高摩擦学性能。凸出微纹理尺寸的几何参数应考虑到纹理结构的最佳尺寸。此外，评估了突出表面纹理的操作条件。在混合润滑和流体动力润滑状态之间存在滑动速度和载荷的过渡点。这项研究表明，SLM-IP Cu NPs 方法是一种用于减少摩擦表面微纹理制造的有前景的方法。提供证据表明由 SLM-IP Cu NPs 制造的突出表面微纹理有助于提高摩擦学性能。凸出微纹理尺寸的几何参数应考虑到纹理结构的最佳尺寸。此外，评估了突出表面纹理的操作条件。在混合润滑和流体动力润滑状态之间存在滑动速度和载荷的过渡点。这项研究表明，SLM-IP Cu NPs 方法是一种用于减少摩擦表面微纹理制造的有前景的方法。提供证据表明由 SLM-IP Cu NPs 制造的突出表面微纹理有助于提高摩擦学性能。凸出微纹理尺寸的几何参数应考虑到纹理结构的最佳尺寸。此外，评估了突出表面纹理的操作条件。在混合润滑和流体动力润滑状态之间存在滑动速度和载荷的过渡点。这项研究表明，SLM-IP Cu NPs 方法是一种用于减少摩擦表面微纹理制造的有前景的方法。评估了突出表面纹理的操作条件。在混合润滑和流体动力润滑状态之间存在滑动速度和载荷的过渡点。这项研究表明，SLM-IP Cu NPs 方法是一种用于减少摩擦表面微纹理制造的有前景的方法。评估了突出表面纹理的操作条件。在混合润滑和流体动力润滑状态之间存在滑动速度和载荷的过渡点。这项研究表明，SLM-IP Cu NPs 方法是一种用于减少摩擦表面微纹理制造的有前景的方法。