Studies On The Design&Construction Of Molybdenum Disulfide Hollow Microspheres And Its Green Tribological Properties

Friction and wear are the main reasons of energy loss and part failure.If the problem of friction and wear cannot be solved effectively,huge economic losses would come into being.Therefore,the researches of lubrication and tribology have become a major issue to improve the economic benefits of human production.As the main way to reduce friction and wear,the application of lubricating oil has been widely used in various fields,such as industry,human life and production,etc.But the application of lubricating oil is often accompanied by the environmental pollution problems such as drip,leakage and so on.As people pay more and more attention to environmental protection,it is imminent to solve the problem of lubricating oil pollution.Therefore,it is an inevitable trend to develop new green lubricating oil additives to adapt to people’s increasing awareness of environmental protection.Based on this,the purpose of this paper is to develop a green additive for lubricating oil which has the function of "lubricant→friction-induction→photocatalyst".In this paper,MoS2 microspheres with hollow morphology were prepared based on the hydrothermal method.The structure,size,crystallinity,dispersion stability and other attributes were characterized by scanning electron microscopy,transmission electron microscopy,ultraviolet visible spectroscopy,X ray diffractometer and other characterization methods.According to the characterization results,the optimum reaction condition for preparing MoS2 hollow microspheres was obtained.Secondly,four-ball testing machine,optical microscope and atomic force microscope were used to explore the tribological properties of MoS2 hollow microspheres which prepared under different reaction conditions.The influence of the concentration ratio of sample and liquid paraffin on its antiwear and antifriction properties was further explored,so as to make the theoretical guidance for the practical applications.In addition,based on the analysis of experimental data,the lubrication mechanism of MoS2 hollow microspheres in liquid paraffin was proposed,and theoretical support of enhanced photocatalytic properties by friction-induction was made.Finally,the photocatalytic properties of the as-prepared products before and after the friction test were studied respectively,and the effects of reaction time and sample concentration on the efficiency of photocatalytic degradation of liquid paraffin were explored,so that the difference in the photocatalytic performance of the samples before and after the friction could been determined.The products before and after friction were observed by a series of characterizations,such as scanning electron microscopy,transmission electron microscopy and UV-Vis diffuse reflectance spectroscopy to explain the reasons of causing the differences in degradation efficiency.In addition,the optimum reaction time and the concentration ratio for the photodegradation of liquid paraffin were also determined.In order to improve the practical application value of as-prepared products,the conditions for enhancing the photodegradation were further discussed.Based on the above experimental data and characterization results,the mechanism of excellent photocatalytic performance of as-prepared MoS2 samples with full-hollow structure and the function transformation mechanism of "lubricant→friction-induction→photocatalyst" were proposed.Thus,it was a sustainable solution for both lubrication-enhancing and photocatalytic degradation functions during different stages of the usage of lubricating oils,which suggests a potential strategy for achieving environmentally friendly developments.