MoS_(2)基复合薄膜真空高温摩擦学性能及其机理研究  

Tribological Properties of MoS_(2)-Based Composite Films at Different Temperature in Vacuum and Its Mechanism

作　　者：王茹 李红轩[2] 吉利[2] 刘晓红[2] 孙初锋[1] WANG Ru;LI Hongxuan;JI Li;LIU Xiaohong;SUN Chufeng(Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission,School of Chemical Engineering,Northwest Minzu University,Gansu Lanzhou 730030,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Gansu Lanzhou 730000,China)

机构地区：[1]西北民族大学化工学院环境友好复合材料国家民委重点实验室,甘肃兰州730030 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2023年第1期73-82,共10页Tribology

基　　金：国家重点研发计划(2021YFB3400400);国家自然科学基金(52167003);甘肃省重点研发项目(21YF5WA064)资助。

摘　　要：采用闭合场非平衡磁控溅射技术分别制备了纯MoS_(2)薄膜以及MoS_(2)-Ti和MoS_(2)-Ti-TiB2复合薄膜,利用真空高温摩擦试验机对比考察三种薄膜在真空环境中25~300℃下的摩擦学性能,通过拉曼光谱(Raman)、X射线衍射(XRD)和透射电镜(TEM)等分析复合元素对薄膜结构的影响以及摩擦前后薄膜结构的变化,探讨摩擦磨损机理.结果表明:纯MoS_(2)薄膜以(002)和(100)晶面取向生长,结构疏松,硬度低,在真空不同温度下摩擦寿命很短;Ti和TiB2复合后,薄膜呈现致密的非晶结构,硬度升高;MoS_(2)-Ti薄膜在低温下(25和100℃)下具有优异的摩擦学性能,当温度达到200℃以上时,摩擦寿命急剧降低;MoS_(2)-Ti-TiB2复合薄膜在25~300℃全温度范围内都保持低的摩擦系数和磨损率,这与其致密的非晶结构、摩擦界面MoS_(2)(002)晶面有序化以及高硬度耐高温TiB2掺入有关;低温下薄膜以磨粒磨损为主,高温下以擦伤为主.Molybdenum disulfide(MoS_(2))is an excellent solid lubricating material,which has been used extensively in space applications,because of its special structure.However,the resistance of MoS_(2)coatings against high temperatures is inadequate and the tribological properties of MoS_(2)coatings are degraded in high temperatures conditions,resulting in an increase of the friction coefficient and a decrease in its working lifetime.This paper aimed to improve the hightemperature resistance performance of Molybdenum disulfide and enable it to be used in a wide temperature range,the Ti and TiB2were adoped in the MoS_(2)films,and the morpholgy,structure and tribology performance were investigated in detailed.Fristly,three kinds of films were successfully prepared by closed-field non-equilibrium magnetron sputtering technology,namely pure MoS_(2)films,MoS_(2)-Ti composite films,and MoS_(2)-Ti-TiB2composite films.XRD and Raman spectroscopy were used to analyze the physical structure and composition of thin films,and the results demonstrated that the texture of the films changed from random mixed orientation with(002)and(100)planes of the pure MoS_(2)films to the preferred(002)orientation with the adoping of Ti,while the MoS_(2)-Ti-TiB2composite films were amorphous.The results of the Raman spectroscopy analysis indicated that the MoS_(2)-Ti-TiB2composite films had the the best ability of antioxidant than the other two kinds of films.The microstructure of the film was characterized by SEM and FIB-TEM,and the analysis showed that the surface of the pure MoS_(2)films were loosed,and that of the composite films were smooth and dense,and the cross section morphology were consistent with it.Thus,the hardness of the MoS_(2)-Ti-TiB2composite films were the highest,and the pure films with loose structure were the lowest.The tribological properties from 25 to 300℃in vacuum environment were investigated by using a vacuum high temperature friction tester.The pure MoS_(2)film growed in(002)and(100)crystalline orientations had very shor

关 键 词：MoS_(2)薄膜 多元复合 TiB_(2) 真空高温 摩擦学性能 摩擦机理 

分 类 号：TH117.1[机械工程—机械设计及理论]