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为延长活塞环的使用寿命,改善活塞环与缸套的摩擦磨损状况,采用闭合场非平衡磁控溅射技术在活塞环表面制备了不同Mo含量的CrMoN复合薄膜,比较研究了电镀Cr活塞环和CrMoN复合薄膜活塞环的纳米硬度和摩擦学性能。采用XRD、SEM-EDS、纳米硬度仪、SRV摩擦磨损试验机,分析了CrMoN复合薄膜的化学成分、相结构、表面形貌、纳米硬度和摩擦学性能。研究结果表明:随着Mo含量的增加,薄膜的晶体生长择优取向由(220)面转为(200)面,晶体结构从以CrN为主的NaCl型面心立方fcc到CrN、MoN混合型fcc,最终转变为以MoN为主的NaCl型fcc。CrMoN复合薄膜表面组织致密,硬度较Cr电镀层有大幅提高。不同Mo含量复合薄膜活塞环的抗摩擦磨损性能较电镀Cr活塞环均有不同程度的提高。
In order to prolong the service life of the piston ring and improve the friction and wear condition of the piston ring and the cylinder liner, CrMoN composite films with different Mo content were prepared on the surface of the piston ring by the closed-field unbalanced magnetron sputtering technique. And CrMoN composite film piston ring nano-hardness and tribological properties. The chemical composition, phase structure, surface morphology, nanohardness and tribological properties of CrMoN composite films were analyzed by XRD, SEM-EDS, nano-hardness tester and SRV friction and wear tester. The results show that with the increase of Mo content, the preferred orientation of the crystal growth is changed from (220) to (200) planes, and the crystal structure changes from the CrN-based face-centered cubic fcc to CrN, the MoN mixed fcc , Eventually transformed into MoN-based NaCl-type fcc. CrMoN composite film surface tissue dense, hardness than Cr plating has greatly improved. The anti-friction and wear properties of different Mo content composite film piston ring are all improved to some extent compared with the electroplating Cr piston ring.