英文文献综述review-article.ppt

ScientificLiteratureReadingsScientificLiteratureReadingsName:Name:Student ID:15S008154Student ID:15S008154Winter 2015Winter 2015School of Mechatronics EngineeringSchool of Mechatronics Engineering1ScientificLiteratureReadingsScientificLiteratureReadingsTribology of Graphene:A Tribology of Graphene:A ReviewReviewAuthors:Oleksiy Penkov,Hae-Jin Kim,Hyun-Jon Kim,Dae-Eun Kim2ScientificLiteratureReadingsScientificLiteratureReadingsAbstractAbstract Graphene has received significant attention due to its combination of remarkable mechanical,thermal,chemical and electrical properties.Furthermore,due to its superior strength,graphene has great potential for use as an ultra-thin protective coating for various precision components.In this paper,the latest developments in tribological applications of graphene,theoretical simulations of graphene friction and preparation methods are reviewed.It is shown that various graphene coatings can be successfully used to decrease friction and wear in nano-,micro-and macro-mechanical applications.However,the conditions under which graphene serves as an effective protective coating depends on the operating parameters.A comprehensive review is provided with the aim to assess such characteristics of graphene.BackgroundConclusion3ScientificLiteratureReadingsScientificLiteratureReadings Tribological behavior plays an important role in the performance of ultra-precision mechanical systems.A Brief Review of TribologyA Brief Review of Tribology4ScientificLiteratureReadingsScientificLiteratureReadingsA Brief Review of TribologyA Brief Review of Tribology And the wear resistance determines the mechanical and commercial viability of the device.5ScientificLiteratureReadingsScientificLiteratureReadings However,as a result of surface tension effects,classical methods for reducing friction with lubricating fluids cannot be employed in microsystems.Limitations of Classical MethodLimitations of Classical Method6ScientificLiteratureReadingsScientificLiteratureReadings Different types of thin coatings such as soft metals,organic compounds such as self-assembled monolayers,bi-layer and multilayer hard coatings,diamond-like carbon films and nanostructured coatings can be used to reduce friction and wear in micro-devices.Unfortunately,despite reports of numerous proposed coatings,an optimum method for reducing the friction and wear of these devices has not yet been identified.Limitations of Classical MethodLimitations of Classical Method7ScientificLiteratureReadingsScientificLiteratureReadings New Breakthrough of Tribology New Breakthrough of Tribology The combination of the remarkable mechanical,thermal,chemical and electrical properties of graphene sheets and their relatively low production cost distinguish them from other materials used for nano-electromechanical applications.Thus,graphene is considered as a promising material for future applications in nanoelectronic and miniaturized devices.8ScientificLiteratureReadingsScientificLiteratureReadings New Breakthrough of Tribology New Breakthrough of Tribology Furthermore,due to its superior strength,graphene has great potential for use as an ultra-thin protective coating for various precision components exposed to contact stress.9ScientificLiteratureReadingsScientificLiteratureReadings Preparation of Graphene Preparation of Graphene Among these techniques,the chemical vapor deposition(CVD)growth method appears to be the most promising for large-scale production of mono-or few-layer graphene films.10Simulations and PredictionsSimulations and PredictionsScientificLiteratureReadingsScientificLiteratureReadings These simulation studies related to the tribological characteristics of graphene,friction was the primary focus.The influence of various parameters on friction,such as the number of graphene layers,normal force,adhesion force and sliding velocity,were investigated.The purpose of these works was to provide insight into the frictional mechanism of graphene,and the simulations could sufficiently reproduce the experimentally observed trends of graphene frictional behavior.Moreover,several results that could not be observed by experimental methods,such as the motion of individual atoms,were obtained from simulations which aided in increasing the understanding regarding the frictional mechanism of graphene.11ScientificLiteratureReadingsScientificLiteratureReadings Conclusions Conclusions1.The key factors that were found to influence the friction and wear behaviors of graphene were number of layers,deposition method,and substrate material.2.Despite the ultra-thin nature of graphene sheets,they were effective in reducing the friction and wear not only under micro-scale contact loads but also in relativelyhigh loads.3.Furthermore,the type of substrate needed to produce the tribological advantages of graphene was not limited to extremely flat and smooth surfaces.Graphene was found to be effective even on metallic substrates with typical surface topography.12ScientificLiteratureReadingsScientificLiteratureReadingsFuture Research DirectionFuture Research Direction With the development of more efficient graphene deposition methods over a large area,the use of graphene in tribological applications is expected to grow continuously in the future.Deposition MethodsDeposition Methods13ScientificLiteratureReadingsScientificLiteratureReadingsRelationshipsRelationships I will learn and study tribology in the future.The paper give me a guideline if I need several special solid lubrication materials.And graphene is certainly the first choice for me.Besides,I am going to study it thoroughly and completely in my latter research!14ScientificLiteratureReadingsScientificLiteratureReadingsTHANKS FOR WATCHING!THANKS FOR WATCHING!THE ENDTHE END15此课件下载可自行编辑修改，供参考！感谢您的支持，我们努力做得更好！16