Feng Kai, Ni Jing, Wang Zixuan, Meng Zhen
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China.
Sci Rep. 2023 Aug 14;13(1):13180. doi: 10.1038/s41598-023-39721-2.
Inadequate lubrication of the two touching surfaces during friction can lead to severe wear, especially in metal cutting. Therefore, a surface with synergistic anti-friction effect of texture and solid lubricant was proposed to improve lubrication. A mesh texture with excellent wettability was prepared on the high-speed steel (HSS) surface by laser, and then nylon fibers were vertically implanted into the grooves of the texture using the electrostatic flocking technology. The friction and wear state of different surfaces (smooth, textured, flocking) under dry/oil-lubricated were studied by a linear reciprocating wear tester. The coefficient of friction (COF) under different working conditions was used to analyze the anti-friction properties, and the wear rate was used to evaluate the wear resistance of the surface. The results showed that the tribological properties of flocking surfaces were better than those of the other two surfaces. This is because the addition of nylon fibers eases shear at the edges of the texture. The broken fibers form a solid lubricating film on the specimen surface, which prevents the surface from being scratched by debris. In addition, it is found that COF decreases with increasing load. Finally, the rapid wettability of the oil droplets on the flocking surface shows the great potential of the surface for lubrication and anti-friction.
在摩擦过程中，两个接触表面的润滑不足会导致严重磨损，尤其是在金属切削中。因此，为了改善润滑性能，提出了一种具有纹理和固体润滑剂协同减摩作用的表面。通过激光在高速钢（HSS）表面制备了具有优异润湿性的网格纹理，然后利用静电植绒技术将尼龙纤维垂直植入纹理凹槽中。采用线性往复磨损试验机研究了不同表面（光滑、有纹理、植绒）在干摩擦/油润滑条件下的摩擦磨损状态。利用不同工况下的摩擦系数（COF）分析减摩性能，利用磨损率评估表面的耐磨性能。结果表明，植绒表面的摩擦学性能优于其他两种表面。这是因为尼龙纤维的加入减轻了纹理边缘的剪切力。断裂的纤维在试样表面形成固体润滑膜，防止表面被碎屑划伤。此外，还发现摩擦系数随载荷增加而降低。最后，油滴在植绒表面的快速润湿性表明该表面具有很大的润滑和减摩潜力。
