英文文献综述review article.ppt

1、Scientific Literature Readings,Name: 杨永喜 Student ID: 15S008154 Winter 2015 School of Mechatronics Engineering,Scientific Literature Readings,Tribology of Graphene: A Review,Authors: Oleksiy Penkov, Hae-Jin Kim, Hyun-Jon Kim, Dae-Eun Kim,Scientific Literature Readings,Abstract,Graphene has received s

2、ignificant 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 developme

3、nts 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 conditio

4、ns 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.,Background,Conclusion,Scientific Literature Readings,Tribological behavior plays an important role in the

5、 performance of ultra-precision mechanical systems.,A Brief Review of Tribology,Scientific Literature Readings,A Brief Review of Tribology,And the wear resistance determines the mechanical and commercial viability of the device.,Scientific Literature Readings,However, as a result of surface tension

6、effects, classical methods for reducing friction with lubricating fluids cannot be employed in microsystems.,Limitations of Classical Method,Scientific Literature Readings,Different types of thin coatings such as soft metals, organic compounds such as self-assembled monolayers, bi-layer and multilay

7、er 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.,Limitatio

8、ns of Classical Method,Scientific Literature Readings,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-electromechani

9、cal applications. Thus, graphene is considered as a promising material for future applications in nanoelectronic and miniaturized devices.,Scientific Literature Readings,New Breakthrough of Tribology,Furthermore, due to its superior strength, graphene has great potential for use as an ultra-thin pro

10、tective coating for various precision components exposed to contact stress.,Scientific Literature Readings,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

11、.,Simulations and Predictions,Scientific Literature Readings,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 slid

12、ing 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 e

13、xperimental methods, such as the motion of individual atoms, were obtained from simulations which aided in increasing the understanding regarding the frictional mechanism of graphene.,Scientific Literature Readings,Conclusions,1. The key factors that were found to influence the friction and wear beh

14、aviors 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 relatively high loads.,3. Furthermore, the type of subs

15、trate 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.,Scientific Literature Readings,Future 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 Methods,Scientific Literature Readings,Relationships,I will learn and study tribology in the future. The paper give me a guide