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为降低活塞环与缸套摩擦副的磨损及延长活塞环的使用寿命,本文采用多弧离子镀在活塞环表面制备了CrN及CrTiAlN复合膜,比较研究了Cr电镀层与CrN,CrTiAlN复合膜的纳米硬度及高温摩擦磨损性能,采用X射线衍射、扫描电子显微镜、能谱仪、纳米硬度仪和发动机台架试验装置,系统分析了CrTiAlN复合膜的成分、相结构、表面形貌、纳米硬度和抗高温摩擦磨损性能,研究结果表明:CrTiAlN复合膜的主要组成成分为Cr,Ti,Al,N,复合膜中含有CrN,Cr2N,TiN和非晶的AlN相。CrTiAlN复合膜表面组织致密,均匀分布着许多颗粒,最大的达400 nm以上,而最小的仅几十纳米。断面结构为纤维状的柱状晶组织。CrN,CrTiAlN复合膜比电镀Cr具有较优的力学性能和高温摩擦磨损性能,与缸套匹配性能良好,最后对三种活塞环涂层的摩擦副匹配机理进行了分析讨论。
In order to reduce the wear of piston-cylinder friction pair and prolong the service life of piston ring, CrN and CrTiAlN composite membranes were prepared by multi-arc ion plating on the surface of piston ring. The effects of Cr plating, CrN and CrTiAlN composite films Nano-hardness and high-temperature friction and wear properties of the CrTiAlN composite films were studied systematically by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, nanohardness tester and engine bench test equipment. The composition, phase structure, surface morphology, The results show that the main components of CrTiAlN composite films are Cr, Ti, Al and N, and the composite films contain CrN, Cr2N, TiN and amorphous AlN phases. CrTiAlN composite membrane surface tissue dense, uniform distribution of many particles, the largest up to 400 nm above, while the smallest only tens of nanometers. The cross-sectional structure of the fibrous columnar crystal structure. CrN and CrTiAlN composite films have better mechanical properties and high temperature friction and wear properties than that of Cr plating. The matching performance with cylinder liner is good. Finally, the friction pair matching mechanism of three piston ring coatings is analyzed and discussed.