目的 银具有低的剪切强度，可以降低涂层的摩擦磨损，在TiN硬质涂层中引入软金属Ag，以期拓展其在摩擦学领域的应用范围。方法 采用多弧离子镀沉积技术，在SUS304不锈钢基底上成功制备了TiN/Ag复合涂层。利用扫描电子显微镜、纳米压痕仪、RST³划痕仪，分析了TiN/Ag涂层的微观结构和机械性能。利用CSM(大气)和HVTRB(真空)摩擦磨损试验机评估了TiN/Ag涂层的摩擦学性能。结果 TiN/Ag涂层结构致密，厚度为1.2 μm，硬度约为28.4 GPa。摩擦学测试表明，真空环境下的摩擦因数远低于大气环境下的摩擦因数，大气环境下的磨损机理主要为粘着磨损与磨粒磨损，而真空环境下主要表现为机械抛光及摩擦转移膜。真空环境下TiN/Ag涂层不同载荷下的摩擦试验表明，1 N载荷条件下，摩擦因数值低至0.07，且涂层发生轻微磨损;3 N载荷条件下，机械能和热应力使得摩擦界面中的Ag发生扩散，摩擦因数迅速增加到0.42左右;5 N载荷条件下，摩擦因数呈现较明显的波动，随着滑动次数的增加，摩擦因数最高达到1.0，涂层表面发生软化形成犁沟效应，而导致涂层失效。结论 TiN/Ag涂层中Ag掺杂可显著降低涂层的内应力，抑制摩擦过程中涂层微裂纹的扩展，适当载荷下能够有效地改善TiN硬质涂层真空下的摩擦学性能。

Silver has low shear strength, which can reduce the friction and wear of the coating. TiN/Ag composite coatings were successfully prepared on SUS304 stainless steel substrates by multi-arc ion plating. Microstructure and mechanical properties of TiN/Ag coatings were analyzed by a scanning electron microscopy, nano-indentation and RST3 scratch tester. Tribological properties of TiN/Ag coatings were evaluated by CSM (atmosphere) and HVTRB (vacuum) tribometer. TiN/Ag coatings have compact structure and Ag has obvious grain strengthening effect. The results showed that the TiN/Ag coatings with a thickness of 1.2 μm and hardness of 28.4 GPa has a uniform and compact structure. The Tribological test shows that the friction coefficient in vacuum environment is much lower than that in atmospheric environment. The main wear mechanism in atmospheric environment is adhesive wear and abrasive wear, while in vacuum environment it is mainly mechanical polishing and tribolayers. The friction experiments of TiN/Ag coatings under different loads in vacuum environment show that the friction coefficient is as low as 0.07 under 1 N load, and slight wear occurs on the coatings; under the condition of 3 N load, the mechanical energy and thermal stress make the Ag diffuse at the friction interface, and the friction coefficient increases rapidly to about 0.42; the friction coefficient fluctuates obviously under 5 N, and increases with the increase of sliding time. The highest coefficient is 1.0, and the surface of coating softens to form furrow effect, which leads to coating failure. Conclusion The doping of Ag in the TiN/Ag coating can significantly reduce the internal stress of the coating, inhibit the extension of microcracks during the friction process, and improve the tribological properties of TiN hard coating under an appropriately low load in a A vacuum environment.