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采用多弧离子镀在活塞环65Mn钢基体表面制备CrTiAlN微纳米复合膜,研究了CrNx过渡缓冲层与工作负偏压对CrTiAlN微纳米复合膜性能的影响规律,采用X射线衍射(XRD)、扫描电子显微镜(SEM)、划痕仪、纳米硬度仪和发动机台架试验装置,系统分析了薄膜相结构、表面形貌、纳米硬度和抗高温摩擦磨损性能。结果表明:当N2含量为45%时,CrNx薄膜中主要以CrN(220)相为主,此时复合膜结合强度相对较高;复合膜厚度随负偏压增大而减小,纳米硬度随负偏压增大而增大,当偏压为–200V时,CrTiAlN微纳米复合膜的晶粒较为细小。采用优化工艺沉积的CrTiAlN复合膜具有优异的抗高温粘着磨损性能,优于CrN膜和电镀Cr,最后对3种活塞环涂层的抗高温磨损机理进行了分析讨论。
CrTiAlN micro-nano composite film was prepared by multi-arc ion plating on 65Mn steel base of piston ring. The influence of CrNx transition buffer layer and working negative bias on the properties of CrTiAlN micro / nano composite film was studied. XRD, SEM, scratch tester, nano-hardness tester and engine bench test device were used to systematically analyze the phase structure, surface morphology, nano-hardness and high-temperature friction and wear properties. The results show that when the content of N2 is 45%, the CrNx film mainly consists of CrN (220) phase, and the bonding strength of the composite film is relatively high at this time. The thickness of the composite film decreases with the increase of the negative bias voltage. Negative bias increases and increases, when the bias voltage is -200V, CrTiAlN micro-nano composite film grain is more small. The CrTiAlN composite film deposited by the optimized process has excellent high temperature adhesion and wear resistance, better than the CrN film and Cr plating, and finally discussed the high temperature wear mechanism of the three kinds of piston ring coating.