Combining nano diamond-like carbon coatings with fillers for enhanced wear resistance of PTFE: Nodal support-lubrication mechanism

作者：Zhihao Chen, Jian Wu, Shixue He, Yefei Zhou, Shouyao Liu, Benlong Su, You Wang · 发表于：Surface and Coatings Technology · 年份：2025 · DOI：10.1016/j.surfcoat.2025.131807 · 被引用次数：10 · 研究领域：Tribology and Wear Analysis、Diamond and Carbon-based Materials Research、Metal and Thin Film Mechanics

Enhancing the wear resistance of polytetrafluoroethylene (PTFE) sealing elements in aerospace hydraulic systems is essential for the development of high-speed and high-pressure, and a singular modification is inadequate for fulfilling. In order to address this requirement, we investigated a synergistic modification through nano diamond-like coatings (DLC) combined with fillers. We evaluated the effect of the fillers on the structure of the DLC coatings and investigated the wear resistance mechanism. The results show that the synergistic modification further enhances the wear resistance of PTFE composites compared to the filler modification, which is attributed to the altered wear mechanism. The structural and compositional differences between the filler and the DLC coatings affect the coating deposition . Carbon fiber (CF) and DLC coating with similar structural characteristics can form surface nodal structures with interfacial load support and self-lubricating properties. The support-lubrication nodal structures are effective in avoiding the deterioration of tribological performance due to the difference properties of the coating-substrate. Moreover, the number of support-lubrication nodal structures affects the wear resistance effect. In conclusion, this study provides a new idea to enhance the wear resistance of PTFE composites through the synergistic modification of nano DLC coatings and fillers.