MoS_(2)-Ti自润滑复合薄膜的高温摩擦学性能研究

Tribological Properties of MoS_(2)-Ti Self-lubricating Composite Film at High Temperature

目的探究Ti含量对MoS_(2)-Ti复合薄膜高温摩擦学性能的影响,制备高温摩擦性能良好的MoS_(2)-Ti复合薄膜。方法采用射频和直流双靶共溅射技术沉积了不同Ti含量的MoS_(2)-Ti复合薄膜,研究了Ti含量对MoS_(2)-Ti薄膜微观结构和力学性能的影响,进一步探究了MoS_(2)-Ti复合薄膜在大气环境下的高温摩擦学性能。采用能谱仪(EDS)、X射线衍射仪(XRD)和扫描电子显微镜(SEM),对薄膜的成分、晶相结构及微观形貌进行分析。利用显微维氏硬度计测试薄膜的力学性能,通过UMT-TriboLab摩擦磨损试验机评价薄膜的摩擦磨损性能。此外,采用SEM、拉曼光谱仪(Raman)和X射线光电子能谱仪(XPS),对薄膜的磨痕形貌及对偶球转移膜的成分进行分析。结果Ti掺杂促进了MoS_(2)薄膜以(002)晶面择优取向生长,且提高了薄膜的致密度,薄膜硬度从70HV提升到350HV。MoS_(2)-Ti复合薄膜在高温环境下的摩擦性能,随Ti含量的增加呈先上升后下降的趋势,其中Ti原子数分数为6.81%的MoS_(2)-Ti复合薄膜具有较低的摩擦因数和磨损率。通过对转移膜的成分进行分析,发现处于300℃高温环境下,Ti原子数分数为13.51%的MoS_(2)-Ti复合薄膜由于在摩擦过程中生成的氧化物较多,其耐磨性能开始下降。结论Ti含量对MoS_(2)-Ti复合薄膜的高温摩擦学性能有明显的影响,掺杂适量Ti能显著提高MoS_(2)薄膜在大气环境下的高温摩擦学性能。

This paper aims to explore the effect of Ti content on the tribological properties of MoS_(2)-Ti composite films at high temperature,and prepare MoS_(2)-Ti self-lubricating composite film with good friction properties at high temperature.The MoS_(2)-Ti composite films with different Ti contents were deposited by radio frequency and direct-current dual-target co-sputtering techniques.The effects of Ti content on the microstructures,mechanical properties and tribological behaviors at high temperature of the MoS_(2)-Ti composite films were investigated.The composition,crystal phase structure and microstructure of the films were analyzed by energy dispersive spectroscopy(EDS),X-ray diffraction(XRD)and scanning electron microscopy(SEM).A microhardness tester was applied to evaluate the mechanical properties of the MoS_(2)-Ti composite films.UMT-TriboLab tribotest was employed to evaluate the tribological properties of MoS_(2)-Ti composite films.Raman spectroscopy and X-ray photoelectron spectroscopy(XPS)were used to further analyze the wear surface of the films and the composition of the transfer films on the counterparts.The results showed that Ti doping promoted the growth of the MoS_(2)-Ti composite films in the preferred orientation of(002)crystal plane,and improved the density of the film.The hardness of the film increased from 70HV to 350HV as Ti doping into MoS_(2).The tribological properties of the MoS_(2)-Ti composite films at high temperature increased firstly and then decreased with the increase of Ti content,and the MoS_(2)-Ti composite films with Ti content of 6.81at.%possessed the best tribological properties.By analyzing the composition of the transfer film,it was found that the wear resistance of the MoS_(2)-Ti composite films with Ti content of 13.51at.%began to decline at 300℃due to more oxides generated during the sliding process.The tribological properties of the MoS_(2)-Ti composite films at high temperature were greatly affected by the Ti content,and appropriate Ti doping could significantly improve the tribological properties of the MoS_(2)films at high temperature in atmospheric environment.