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采用阴极离子镀在TiC金属陶瓷刀具表面制备了AlCrN涂层,采用球/平面接触方式考察了900℃高温时不同载荷作下涂层的摩擦磨损行为。通过扫描电镜观察了磨痕轮廓和微观形貌,并用能量散射谱和X射线衍射分析了磨损后涂层表面化学元素和物相的变化,讨论了载荷对涂层摩擦因数和磨损性的影响。结果表明,经900℃高温氧化后,涂层中N元素全部释放,形成Al和Cr的氧化物,改善了润滑性能和磨损性能;在载荷600,800和1000 g作用下,涂层摩擦因数平均值分别为0.1455,0.3939,0.4188,在载荷600 g时表现出优良的摩擦特性,适用于精密切削加工;在高温下AlCrN涂层表现为氧化磨损,同时伴随着少量的磨粒磨损和黏着磨损。
AlCrN coating was prepared on the surface of TiC cermet tool by cathodic ion plating. The friction and wear behavior of the coating under different loadings was investigated by ball / plane contact method at 900 ℃. Scanning electron microscope (SEM) was used to observe the contour and microstructure of the wear scar. The chemical elements and phase changes of the worn coating were analyzed by energy dispersive spectroscopy and X-ray diffraction. The influence of load on the friction coefficient and wear resistance of the coating was also discussed. The results show that all the N elements in the coating are released after the high temperature oxidation at 900 ℃ to form oxides of Al and Cr to improve the lubricity and wear properties. Under the loads of 600, 800 and 1000 g, the average friction coefficient of the coatings are respectively 0.1455, 0.3939, 0.4188, showing excellent tribological properties at a load of 600 g for precision machining; the AlCrN coating exhibits oxidative wear at high temperatures with a small amount of abrasive wear and adhesive wear.