摘要
目的制备在大气环境中可以实现超低摩擦的TaSe_(2)/MoS_(2)异质复合涂层,并探讨大气环境中不同湿度对其摩擦学性能的影响。方法结合异质超润滑理论及价键结构稳定性设计思路,采用喷涂法制备TaSe_(2)/MoS_(2)异质复合涂层和MoS2涂层,考察它们在不同湿度的大气环境中的摩擦学性能。利用三维轮廓仪和光学显微镜对比研究2种涂层的磨损情况。通过能谱仪(EDS)和拉曼光谱(Raman)分析不同湿度下2种涂层的磨痕元素分布、润滑膜的氧化程度及差异,进一步研究不同涂层的磨痕及转移膜的化学组成和结构,并对异质复合涂层的摩擦学机理进行探讨。结果制备的TaSe_(2)/MoS_(2)异质复合涂层在相对湿度10%的大气环境中的摩擦因数低至0.013,表现出超低减摩性能。当大气相对湿度从30%逐渐增加到75%时,虽然TaSe_(2)/MoS_(2)异质复合涂层的摩擦因数增加,但是仍低于同等测试条件下MoS2涂层的摩擦因数。同时,TaSe_(2)/MoS_(2)异质复合涂层在不同湿度下的磨损程度也均低于MoS2涂层。通过摩擦界面的元素分布和化学结构分析,进一步证明了摩擦过程中异质复合结构润滑膜的形成及其抗氧化作用。结论在MoS2涂层中引入离子键强度更高的TaSe2可以延缓活性分子对MoS2结构的破坏作用,同时异质摩擦界面的形成有助于降低摩擦因数。
The work aims to prepare TaSe_(2)/MoS_(2) heterogenous composite coating with ultralow friction coefficient in air environment and study the impact of different relative humidity on the tribological properties of the coating.TaSe_(2)/MoS_(2) heterogenous composite coating and MoS2 coating were prepared through spraying method based on the theory of heterogeneous superlubricity and the design concept of valence bond structure stability.Further,tribological properties of TaSe_(2)/MoS_(2) heterogenous composite coating and MoS2 coating in air with different relative humidity were studied.The surface morphology of wear tracks and transfer films of TaSe_(2)/MoS_(2) heterogenous composite coating and MoS2 coating were studied and compared by the optical microscopy.Then,the wear rate of these two coatings was studied by 3D profilometer.To reveal the tribological mechanism of heterogenous coating,the distribution of chemical elements on the wear tracks and the degree of oxidation of TaSe_(2)/MoS_(2) heterogenous composite coating and MoS2 coating under different relative humidity were analyzed by energy dispersive spectroscopy(EDS)and Raman spectroscopy.In addition,the chemical structure and composition of the wear tracks and transfer films of different coatings were also studied by EDS and Raman spectroscopy.The ultralow friction coefficient of TaSe_(2)/MoS_(2) heterogenous composite coating was achieved in air with 10%RH,in which the friction coefficient was as low as 0.013.Although the friction of TaSe_(2)/MoS_(2) heterogenous composite coating increased with the increasing relative humidity from 30%to 75%,it was still lower than that of MoS2 coating under the same testing conditions.The wear track depth and the wear rate of TaSe_(2)/MoS_(2) heterogenous composite coating were all lower than those of MoS2 coating in air with different relative humidity,indicating that the overall tribological and anti-wear properties of TaSe_(2)/MoS_(2) heterogenous composite coating were obvious better than those of MoS2 coating.Further,EDS and Raman patterns showed that the lubricant film of heterogeneous composite coating was composed of the coexistence structure of TaSe2 and MoS2,indicating the formation of heterogenous friction interface,which was important for achieving low friction coefficient.O contents of TaSe_(2)/MoS_(2) heterogenous composite coating wear tracks in air with different relative humidity were also lower than that of MoS2 coating,which indicated that the oxidation degree of TaSe_(2)/MoS_(2) composite coating was slight compared to MoS2.The intensity of MoO3 Raman characteristic peaks of different lubricating coating friction interfaces in 10%RH,40%RH,and 75%RH could also prove the excellent oxidation resistance of TaSe_(2)/MoS_(2) composite coating.It can be concluded that MoS2/TaSe2 heterogenous friction interface could prevent the MoS2 from oxidative damage,which is beneficial in the stable chemical structure of TaSe2.In summary,TaSe_(2)/MoS_(2) heterogenous composite coating can exhibit ultralow tribological properties in 10%RH due to the existence of TaSe_(2)/MoS_(2) heterogenous composite lubricating film.The chemical bond strength of Se-Ta is higher than that of S-Mo and difficult to be damaged by active molecules,so TaSe_(2)/MoS_(2) composite lubricating film has better wear and oxidation resistance than MoS2 coating.A new heterogenous composite lubricity with ultralow friction is prepared in low relative humidity,which is important for the engineering application of superlubricity theory in air.
作者
朱东翔
李红轩
刘晓红
李湛
吉利
ZHU Dongxiang;LI Hongxuan;LIU Xiaohong;LI Zhan;JI Li(State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第21期23-33,共11页
Surface Technology
基金
中国科学院战略性先导科技专项(XDB 0470202)
国家自然科学基金(52275222)
中国科学院青促会优秀会员(Y202084)
“一三五”重大突破项目(KJZLZD-3)
甘肃省科技重大专项(22ZD6GA002)
中国博士后科学基金(2022M723224)。
关键词
大气环境
超低摩擦
摩擦界面
异质结构
摩擦机理
air environment
ultralow friction
friction interface
heterostructure
tribological mechanism
