摘要
针对MoS_(2)在潮湿环境易氧化和润滑失效的问题,从增强离子键强度的角度探索改善其抗氧化以及润滑湿度适应性.选择了离子键更强的NbSe_(2)进行对比,采用磁控溅射法分别制备了NbSe_(2)和MoS_(2)薄膜,研究了两种薄膜在不同湿度下的摩擦学性能,对比其在摩擦稳定阶段的结构和化学组成,探讨了NbSe_(2)在大气高湿度环境下的优势与作用机理.结果表明:NbSe_(2)薄膜在大气环境下的摩擦表现出更佳的湿度适应性,在20%RH、35%RH和55%RH下摩擦系数稳定在0.08左右,直到75%RH下摩擦系数才开始增大,而MoS_(2)薄膜在35%RH下面临润滑性能快速失效的问题,进一步结合XPS和XRD等表征结果发现:相较于MoS_(2),NbSe_(2)在大气摩擦条件下更难氧化,其层层滑移状态能较好维持,能保持长时间的润滑性能,这为大气高湿度服役润滑材料的改进提供了新的思路.
Molybdenum disulfide suffers from tribological degradation in wet and oxygen-containing environments due to oxidation,which limits its application in atmospheric environments.Therefore,improving the tribological properties of MoS_(2) at high humidity or finding alternatives to it is a focus of tribological research.Molybdenum disulphide,as a transition metal dichalcogenides(TMDs) compound,is ionically bonded within its layers and can be regarded as an ionic compound in a sense.As ionic bond strength increases,the chemical activity of the ionic compounds decreases,while stronger ionic bonds also mean that the layers are more resistant to damage.Thus,we wanted to improve the oxidation resistance and lubricating humidity adaptability of TMDs compounds in wet environments by enhancing the ionic bond strength.Niobium disselenide,a TMDs compound as MoS_(2) with more stronger ionic bond than MoS_(2),was selected as a substitute to compare with molybdenum disulfide,and explore the possibility of improvement of the tribological performance in wet environments based on the enhancement of ionic bond strength.In this study,the NbSe_(2) and MoS_(2) films were deposited by magnetron sputtering technique.The friction performances of the two films were studied in different humidity of atmospheric environment(20% RH,35% RH,55% RH,75% RH).Then the crystal structures and chemical compositions of two films were compared in stable wear stage,for finding the mechanism of NbSe_(2) in the environment of high atmospheric humidity.The friction tests results showed that NbSe_(2) film had better friction properties and humidity adaptability in atmospheric environment,the coefficients of friction were stabilized at around0.08 in 20% RH,35% RH,55% RH,and the friction coefficient was not increased until 75% RH,while MoS_(2) films suffered from rapid lubrication failure just in 35% RH.Then,the Raman analysis results showed that MoOpeaks started to appear on the surface of the wear track of MoS_(2) films in 35% RH,and MoS_(2) peaks started to br
作者
黎明登
杨洋
裴露露
刘晓红
刘红妹
LI Mingdeng;YANG Yang;PEI Lulu;LIU Xiaohong;LIU Hongmei(School of Chemistry and Chemical Engineering,Lanzhou Jiaotong University,Gansu Lanzhou 730070,China;Key Laboratory of Science and Technology on Wear and Protection of Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2022年第5期925-934,共10页
Tribology
基金
国家自然科学基金(51775537)
中国科学院青年创新促进会(Y202084)资助。
