Abstract Multilayered Si-DLC coatings with different modulation period were fabricated by plasma enhanced chemical vapor deposition. Friction and wear properties were determined using a reciprocating ball-on disk tester in water and air environments. The multilayered Si-DLC coating exhibits very low friction (~0.05) after running-in period in air. Under water lubrication, the coating maintains low friction (0.07–0.08) at the beginning of the friction. However, when the reciprocating sliding cycle in water reaches a certain value, the friction coefficient starts to rise and finally shows high friction (~0.13). Meanwhile, the wear rate of the coating in water is much lower than that in air. Moreover, we found that the low friction in air is attributed to the deep groove capture of the wear debris and the formation of Si rich transfer layer on the counter ball. The high friction in the water is caused by corrosion on the surface of the counter ball.

中文翻译：

---

探索多层Si-DLC涂层在水和空气环境中的润滑机制

摘要 采用等离子体增强化学气相沉积法制备了具有不同调制周期的多层Si-DLC涂层。在水和空气环境中使用往复式球盘测试仪测定摩擦和磨损性能。在空气中磨合期后，多层 Si-DLC 涂层表现出非常低的摩擦 (~0.05)。在水润滑下，涂层在摩擦开始时保持低摩擦（0.07-0.08）。然而，当水中的往复滑动循环达到一定值时，摩擦系数开始上升，最终呈现高摩擦（~0.13）。同时，涂层在水中的磨损率远低于空气中的磨损率。而且，我们发现空气中的低摩擦归因于磨屑的深槽捕获和平衡球上富硅转移层的形成。水中的高摩擦力是由平衡球表面腐蚀引起的。