Fluorinated graphene (FG) with various fluorine/carbon (F/C) ratios and graphene (G) employed as additions were incorporated into the polytetrafluoroethylene (PTFE) matrix aiming to improve the tribological properties of this self-lubricating polymer. The friction coefficients and wear rates of PTFE-based composites were tested under dry sliding condition using a ball-on-disc configuration. The performances of self-lubricity and wear resistance for four fabricated FG/PTFE composites were superior to those of G/PTFE composite, attributable to the specific surface area and chemical composition of FG sheets with various F/C ratios. Among them, the FG/PTFE composite with filler (F/C ≈ 0.5) loading of 5 wt% exhibited the best tribological property, i.e., the lowest friction coefficient (0.131) and the smallest steady-state wear rate (9.20 × 10^–16 m³/Nm). This can be attributed to the formation of uniform and complete transfer film on the friction interface via the tribochemical reactions.

Graphic Abstract

中文翻译：

---

干滑条件下通过掺入不同氟/碳比的氟化石墨烯改善聚四氟乙烯的摩擦学性能

将具有各种氟/碳（F / C）比的氟化石墨烯（FG）和用作添加剂的石墨烯（G）掺入聚四氟乙烯（PTFE）基体中，旨在改善这种自润滑聚合物的摩擦学性能。PTFE基复合材料的摩擦系数和磨损率是在干式滑动条件下使用圆盘球型结构测试的。四种制备的FG / PTFE复合材料的自润滑性能和耐磨性优于G / PTFE复合材料，这归因于各种F / C比的FG片材的比表面积和化学成分。其中，填充量（F / C≈0.5）为5 wt％的FG / PTFE复合材料表现出最佳的摩擦学性能，即最低的摩擦系数（0.131）和最小的稳态磨损率（9.20×10）^–16  m ³ / Nm）。这可以归因于通过摩擦化学反应在摩擦界面上形成了均匀而完整的转移膜。

图形摘要