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为了改善发动机活塞环的摩擦学性能和提高其使用寿命,采用多弧离子镀技术在活塞环表面制备了不同N2含量和弧电流的CrNx硬膜,采用X射线衍射技术、扫描电子显微镜、纳米硬度仪和发动机台架试验装置,分别测试了薄膜相结构、表面形貌、纳米硬度和抗高温摩擦磨损性能。研究结果表明:当N2质量分数为45%时,薄膜纳米硬度相对较高,CrNx薄膜中主要以CrN(220)相为主;随着弧电流的增加,薄膜的表面颗粒尺寸增加,当弧电流为60A时,薄膜纳米硬度相对较高。与Cr电镀层活塞环相比,CrNx涂层活塞环具有较强的抗高温粘着磨损性能。
In order to improve the tribological performance and service life of the engine piston ring, CrNx hard coatings with different N2 content and arc current were prepared on the surface of the piston rings by multi-arc ion plating technology. X-ray diffraction, scanning electron microscopy, Instrument and engine bench test device were tested thin film phase structure, surface morphology, nano-hardness and high temperature friction and wear properties. The results show that when the mass fraction of N2 is 45%, the nano-hardness of the film is relatively high, and mainly the CrN (220) phase in the CrNx film. As the arc current increases, the surface particle size of the film increases. When the arc current When 60A, the film nano-hardness is relatively high. Compared with the Cr plating piston ring, CrNx coated piston ring has a strong resistance to high temperature adhesive wear.