目的 设计制备用于高速切削难加工材料的长寿命刀具涂层。方法 采用三靶磁控共溅射技术，通过改变石墨靶材的溅射功率，调控不同润滑相的配比，制备具有不同C含量的V-Al-C-N纳米复合涂层。利用纳米压痕仪和高温摩擦试验机，对涂层的力学性能和摩擦学性能进行检测。采用透射电镜和扫描电镜观察涂层的显微结构和摩擦磨损表面形貌，并分析其磨损机理。结果 制备了具有优异性能的V-Al-C-N纳米复合刀具涂层。当涂层中C原子数分数为29.40%时，涂层的硬度和弹性模量分别高达36.3 GPa和370.5 GPa。在室温(RT)~650 ℃宽温域范围内，涂层具有稳定、良好的摩擦学性能。RT条件下，涂层中的磨痕很浅，摩擦因数(COF)为0.43;在300 ℃工作时，对比VAlN涂层，其非晶包裹纳米晶的结构使得掺C后的COF降低了14%，至0.72，磨损机理包含磨粒磨损和氧化磨损;650 ℃条件下，磨痕出现大量犁沟，大量磨屑在摩擦轨道两侧被压实，此时氧化反应明显加剧，涂层表面生成V2O5润滑相，摩擦因数稳定在0.35。结论 采用三靶磁控共溅射技术，在VAlN涂层中引入不同含量的C，可提高其力学性能，并在一定程度上降低涂层的高温摩擦因数。不同温度条件下摩擦因数的变化与涂层的磨损机制有关。

To design and prepare long-life tool coating used for high speed cutting the difficult-to-machining materials. In this paper, using three target magnetron sputtering technology, V-Al-C-N nano-composite coatings with different C content were prepared by changing the sputtering power of graphite target and adjusting the ratio of different lubricating phases. The mechanical and friction properties of the coatings were tested by a nanoindentation instrument and a high-temperature friction tester. The microstructure and friction and wear surface morphology of the coating was observed by transmission electron microscope and scanning electron microscope, and its wear mechanism was analyzed. The V-Al-C-N nanocomposite coating had excellent mechanical properties. When the content of C was 29.40at.%, the hardness and elastic modulus of the coating was as high as 36.3 GPa and 370.5 GPa respectively and had good tribological properties in a wide temperature range from RT to 650 ℃. RT friction conditions are mainly in the form of abrasive wear, with very shallow wear marks. The coefficient of friction (COF) is 0.43. When working at 300 ℃, compared with VAlN coating, the structure of amorphous wrapped nanocrystals reduces the COF by 14% to 0.72 after C doping. The wear mechanism includes abrasive wear and oxidation wear. At 650 ℃, a large number of furrows appear in the wear marks, and a large number of wear debris are compacted on both sides of the friction track. At this time, the oxidation reaction is obviously intensified, V2O5 lubricating phase is formed on the coating surface, and the friction coefficient is stable at 0.35. Using the preparation method of three target magnetron sputtering technology, introduction of C can improve the mechanical properties of VAlN coating, reduce the friction coefficient of the coating at the range of the medium to high temperature to a certain extent. The change of friction coefficient of different coatings is related to the wear mechanism of the coating.