The mechanical and tribological properties of three types of diamond like carbon (DLC) coatings, i.e., non-doped, Si-doped, and W-doped DLC, are evaluated. Dry reciprocating sliding wear tests were performed to evaluate the effect of sliding frequency/velocity on friction, adhesion, and wear. The degree of graphitization of non-doped and W-doped DLC increases with sliding velocity, which results in a lower coefficient of friction (COF), and a decrease in wear rate. Si-doped DLC, however, exhibits distinct friction behaviour, with increasing COF and severe fluctuations in friction at higher sliding velocities. In Si-DLC frictional heating drives the formation of an oxide-rich tribofilm and large amounts of Si-rich oxide wear debris that are both adhesive and abrasive. The oxide-rich tribofilm, and lack of surface graphitization, result in the severe fluctuations of Si-DLC friction via stick-slip and surface fracture/wear mechanisms, and significantly increased COF and wear rates at higher sliding velocities.

评估了三种类金刚石 (DLC) 涂层的机械和摩擦学性能，即非掺杂、Si 掺杂和 W 掺杂 DLC。进行干往复滑动磨损试验以评估滑动频率/速度对摩擦、粘附和磨损的影响。非掺杂和 W 掺杂 DLC 的石墨化程度随着滑动速度的增加而增加，这导致较低的摩擦系数 (COF) 和磨损率降低。然而，Si 掺杂的 DLC 表现出明显的摩擦行为，在更高的滑动速度下，随着 COF 的增加和摩擦的严重波动。在 Si-DLC 中，摩擦加热会导致形成富含氧化物的摩擦膜和大量具有粘性和磨蚀性的富含硅的氧化物磨损碎片。富含氧化物的摩擦膜，缺乏表面石墨化，