Abstract

The PTFE coatings with excellent corrosion-resistance and lubrication properties often stop functioning under high load conditions. In this study, a composite coating of PTFE filled with silane coupling agent modified graphene oxide (mGO/PTFE) was prepared by a simple spin-coating process on textured stainless steel (SS) substrate to protect the substrate from failure under high load rubbing. The grafting reaction between GO and silane coupling agent was analyzed by FTIR, Raman, XRD, TGA, and XPS. The morphologies and tribological properties of the mGO/PTFE coatings on the untextured and textured SS substrates were characterized by SEM and UMT tribometer. The results showed that GO surfaces were successfully grafted by silane coupling agent, resulting in that the composite coating of mGO/PTFE was denser than the pure PTFE coating. The tribo-test results confirmed that the groove texture processed by laser surface texture technology greatly improved the load-bearing capacity and anti-wear life of the PTFE coatings. The PTFE coating on the untextured SS surface fails within half an hour of rubbing at the applied load of 10 N, while the one on the groove-textured surface can maintain low and stable friction coefficient for a long time even under the load of 50 N. In addition, the results showed that the loading of mGO further improve the friction reduction and wear resistance of the PTFE coating on the textured SS surface. The wear scar width and the friction coefficient are significantly reduced by 70% and 30%, respectively, as the PTFE coating was filled by 1.0 wt% mGO. Finally, the mechanisms for achieving outstanding properties of the composite coating of mGO/PTFE on the textured SS surface were illustrated by analyzing the wear surfaces of the coating and the counterpart balls by SEM and EDS.

Graphic Abstract

中文翻译：

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表面纹理化和GO的添加改善了PTFE涂层的承载能力和摩擦学性能

摘要

具有出色的耐腐蚀性和润滑性的PTFE涂层在高负荷条件下通常会停止运转。在这项研究中，通过简单的旋涂工艺在网纹不锈钢（SS）基材上制备了填充有硅烷偶联剂改性氧化石墨烯（mGO / PTFE）的PTFE复合涂层，以防止基材在高负荷摩擦下失效。通过FTIR，拉曼，XRD，TGA和XPS分析了GO与硅烷偶联剂之间的接枝反应。用SEM和UMT摩擦计表征了未织构和带纹理的SS基底上的mGO / PTFE涂层的形貌和摩擦学性能。结果表明，用硅烷偶联剂成功接枝了GO表面，从而使mGO / PTFE复合涂层比纯PTFE涂层致密。摩擦试验结果证实，采用激光表面织构技术处理的沟槽织构大大提高了PTFE涂层的承载能力和抗磨寿命。在10 N的施加载荷下，未变形的SS表面上的PTFE涂层在摩擦的半小时内失效，而即使在50 N的载荷下，凹槽纹理表面上的PTFE涂层也可以长时间保持较低且稳定的摩擦系数此外，结果表明，mGO的负载进一步改善了带纹理的SS表面上PTFE涂层的减摩性和耐磨性。当用1.0 wt％的mGO填充PTFE涂层时，磨损痕迹宽度和摩擦系数分别显着降低了70％和30％。最后，

图形摘要