90 / 2021-05-20 16:52:37

MoS2含量对Mo和S共掺CrN涂层在25-600℃摩擦磨损性能的影响

With increasingly harsh working environments for mechanical systems and the rapid development of various high-tech industries, requirements for the stable operation of mechanical systems are increasing in a wide temperature range. Mo and S co-doped CrN coatings with different MoS₂ contents were prepared via unbalanced magnetron sputtering to provide better friction properties to the coatings at high temperatures. Scanning electron microscopy and nanoindentation were adopted to analyze the microstructure and mechanical performance. The mechanical performance of the coatings was enhanced by increasing the MoS₂ content, however, excessive MoS₂ reduced the mechanical properties of the coatings. Besides, the adhesion of the coating first increased to 33.08N and then decreased rapidly to 7.24N. In addition, the residual stress of the coating first decreased and then increased upon increasing the MoS₂ content. The high-temperature tribological behavior of the coatings was measured from room temperature (25 ℃) to 600 ℃. The friction and wear coefficient of CrN/MoS₂-0.6A coating decreased by 12.9% (0.67) compared with other coatings at room temperature and relatively good comprehensive properties at high temperature. This study provides a feasible design for engineering applications and lays the foundations for the preparation of coatings with superior high-temperature friction properties.

随着机械系统工作环境的日益恶劣和各种高新技术产业的迅速发展，对机械系统在较宽温度范围内稳定运行的要求也越来越高。采用非平衡磁控溅射法制备了不同MoS₂含量的Mo和S共掺杂CrN涂层，以提高涂层的高温摩擦性能。采用扫描电子显微镜和纳米压痕技术对其微观结构和力学性能进行了分析。随着MoS₂含量的增加，涂层的力学性能得到提高，但过量的MoS₂会降低涂层的力学性能。涂层附着力先上升到33.08N，然后迅速下降到7.24N。随着MoS₂含量的增加，涂层的残余应力先减小后增大。在室温（25℃）至600℃下测定了涂层的高温摩擦学性能. 室温下CrN/MoS₂-0.6A涂层的摩擦磨损系数比其它涂层降低了12.9%（0.67），高温下综合性能较好。本研究为工程应用提供了可行的设计方案，为制备具有优良高温摩擦性能的涂层奠定了基础。