The Influence Law And Mechanism Of Environmental Humidity On The Friction And Wear Of MXene

As a new layered two-dimensional material,MXene has great prospects in friction lubrication applications.Humidity has a great influence on solid lubricants,but its effect on MXene is unclear.Therefore,exploring the surface properties of MXene under different humidity and exploring ways to increase the anti-friction effect of MXene can not only explore the friction and wear mechanism of MXene under different humidity,but also increase MXene as a technical reserve for anti-friction lubricating coatings.This article starts from the study of MXene surface properties at the microscopic level,and finally transitions to the study of macroscopic friction and wear.The main research contents and innovations of this paper are summarized as follows:(1)The effect of environmentally adsorbed water on the adhesion of MXene was investigated,and the mechanism of adhesion change was explained.Through the atomic force microscope to measure the adhesion under different humidity,it was found that the adhesion of MXene has the value of hydrophobic material and the tendency of hydrophilic material.By characterizing the surface water structure,it was found that there is a strong hydrogen-bonded water structure on the surface.It was inferred that the strong hydrogen-bonded water structure on the surface of MXene appears in the form of water clusters,and the weak hydrogen-bonded water structure covers it.(2)The randomness and repairability of friction and wear of MXene were discovered,and the mechanism of the influence of the structure of sample functional groups on friction and wear was revealed.Different wear conditions appeared in the wear process of MXene,which tends to two categories: easy to wear and hard to wear,and the easy to wear surface will be repaired.According to the arrangement of functional groups,the arrangement with higher energy has stronger adsorption capacity,resulting in strong adsorption of MXene with the substrate,making the sample less prone to wear.(3)Explore the macro and micro friction and wear mechanisms under different humidity environments,and propose methods to increase the friction and wear protection performance of MXeneAccording to the microscopic friction and wear experiment,it was found that the friction force first increases and then decreases with the increase of humidity.The effect of surface adsorption of water on the microscopic friction and wear was explored.The macroscopic experiment obtained a good protective effect by increasing the adsorption capacity of the substrate.The macroscopic wear characterization results showed that MXene forms a lubricating film at the wear scar,and the sample and debris were adsorbed together to reduce the impact of debris.A certain thickness of water layer has a lubricating and protective effect under low humidity.Therefore,increasing the adsorption between the sample and the substrate and controlling the environmental humidity are both methods to enhance the friction and wear properties of MXene.