Convenient synthesis of inorganic fullerene-like WS 2 self-lubricating films and their tribological behaviors
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Research Letter
Convenient synthesis of inorganic fullerene-like WS2 self-lubricating films and their tribological behaviors Shikai Liu , Kunlun Jia, Yingxin Chen, and Sankui Xu, School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, P. R. China Feng Li, Key Laboratory of Surface and Interface Science and Technology, Zhengzhou University of Light Industry, Zhengzhou 450002, Henan, P. R. China; American Advanced Nanotechnology, Houston, TX 77459, USA Address all correspondence to Shikai Liu at [email protected] and Sankui Xu at [email protected] (Received 29 February 2020; accepted 25 March 2020)
Abstract In the present work, an efficient route has been further explored to achieve the batch synthesis of inorganic fullerene (IF)-WS2 nanoparticles, and the self-lubricating film is conveniently prepared by coating these nanoparticles on the surface of metal substrates. The as-synthesized IFWS2 nanoparticles have a closed hollow structure with an average particle size of about 50 nm and are evenly distributed in the self-lubricating film. Further friction tests show that the film has excellent friction properties, with its lowest friction coefficient of approximately 0.008, which can be mainly attributed to the unique hollow cage structure and a smaller particle size of the IF-WS2 nanoparticles.
Introduction Friction and wear of the surfaces in many mechanical working environments seriously affect the power loss and mechanical durability. The development of efficient lubricants that possess lower friction coefficients is an effective way to improve the lubrication performance of mechanical surfaces. In recent decades, inorganic fullerenes (IFs) have good prospects in the field of lubrication due to their unique hollow-cage structure and excellent physical and chemical properties.[1–3] As early as 1992, it was recognized that layered metal dihalides (such as MoS2 and WS2) can form IF-like structures.[4,5] At that time, it was known that these layered solids had good lubrication performance. The researchers then demonstrated that IF-WS2 or IF-MoS2 nanoparticles have significantly better lubrication performance than that of the corresponding layered structure.[6–8] With the development of modern industrial technology, great attention have been attracted to solve the lubrication problems under special working conditions (e.g. vacuum or strong radiation and corrosion).[9,10] A large number of studies show that IF-MS2 (M = W, Mo) has a good potential to solve these problems,[11–15] but there are still many problems in a large-scale application. Self-lubricating films are often used as an alternative lubricant when these lubricating oils (greases) cannot be used. It has been found that introducing WS2 or MoS2 nanoparticles into the workpiece surface to form self-lubricating films can reduce friction very well. However, to make these lubricating films, either the synthesis method and process are complex and difficult to control, or special conditions and equipment are needed.[16–19] R
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