Tribological properties of Tin moS2/Ag film deposited by PLD technique at elevated temperature to 90

来源 :第十一届全国表面工程大会暨第八届全国青年表面工程学术会议 | 被引量 : 0次 | 上传用户:tonytanli
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
  In order to develop a lubricating film with excellent mechanical and tribological performance in wide temperature range, the Tin moS2/Ag composite films that constitute of hard ceramic and low-, medium-, temperature lubricating phases were prepared by using the pulsed laser deposition (PLD) techniques. Moreover, the microstructures, tribological properties of the composite films were investigated by XRD, SEM, UMT-3 tribometer, Raman spectroscopy, respectively. The results show that the Tin moS2/Ag composite film exhibit polycrystalline structure, which is composed of TiN, MoS2, Ag phase and is majority of TiN. According to the SEM and XRD investigation, the film show a flat and smooth surface morphology, and register a uniform and compact nanostructur. With the raising of test temperatures, the friction coefficients increase only a little from 0.05 at room temperature to 0.1 at 400 ℃, increase to 0.2 at 500 ℃ but decrease to 0.14 at 700 ℃, and is 0.33 at 900 ℃. On the base of XRD and Raman results of wear track, the lubrication depend on the layered structure MoS2 and soft metal Ag at room temperature, so possess the lowest friction coefficient and the wear track is very flat and smooth. At the temperature of 300 ℃ and 400 ℃, the wear track is wider than that of room temperature due to the metal Ag soften, and the contact area become larger under the action of loading force during the friction process. In addition, the MoS2 starts to decompose partly, but the undecomposed MoS2 is still able to exert its lubrication, the silver also play a critical lubrication in this case, and a layer of lubricating film formed on the wear track. When the temperature rises to 500 ℃, as can be seen from the wear track morphology that silver migrate apparently, the film lubrication rely mainly on silver and silver oxides due to the complete oxidative decomposition of MoS2. In the case of 700 ℃, the layered structure silver molybdates (such as Ag2MoO4, Ag2MoO7) generated through the tribochemical reaction were beneficial for lubricious effects, and the friction coefficient decrease to 0.14 from 0.2 at 500 ℃. Up to the temperature of 900 ℃, the friction coefficient is volatile and increase steeply due to wear failure of the film. The Tin moS2/Ag composite film deposited by PLD technique exhibit outstanding tribological properties below the temperature of 700 ℃, and the variations of the friction coefficient are minor ones. It is also anticipated that the composite films could be applied to lubrication in wide temperature from room temperature to 700 ℃.
其他文献
铝铜异种金属接头广泛应用于电力、化工、制冷和航空航天工业等邻域中,焊接是实现铝铜连接并满足其接头导电、导热性能的可靠方法,但仍然存在一些问题。首先,铝和铜焊接性较差,两种金属都很容易被氧化,易在界面形成氧化膜,影响结合;其次,两者的导热率和比热都较高,线膨胀系数及熔点相差较大,直接连接将产生很大的焊接应力;此外,在高温下,两种金属液体易吸收大量气体,使得焊缝中出现气孔,同时易形成Cu3Al2和Cu
Magnesium has attracted much attention as a class of biodegradable metallic biomaterials. However, the corrosion resistance and biocompatibility still need to be improved according to clinical demands
会议
In this paper, the hydro-thermal synthesis method has been used to prepare the three-dimensional self-assembly graphene (3D-G). Different shapes of 3D-G have been obtained by adjusting the reaction-ti
在铝合金表面通过阳极氧化法在多孔层外构筑一层光滑致密的耐磨层是一项有挑战的工作.本文中阴极和阳极均采用铝合金,通过调控草酸和铝离子浓度,在铝合金表面构筑了新颖的多层结构,除传统阳极氧化膜的阻挡层和多孔亚表层以外,表面构筑了一层光滑致密的耐磨表层.通过扫描电镜、XRD、XPS、EDS分析了这种新型阳极氧化膜的表面形貌和化学组成.结果 表明耐磨表层由非晶态氧化铝组成,其表面光滑致密有别于传统阳极氧化膜
表面超疏水特性是自然界中极为常见的现象,通常将超疏水表面定义为与液滴接触角大于150°,滚动角小于10°的表面。人们在认识与研究自然过程中,试图将仿生属性与某些特性相结合,透明超疏水表面便是其中应运而生的代表产物。顾名思义,透明超疏水表面是将材料的透光性与超疏水性相结合的表面,这类表面具有广泛的应用前景,例如它可被应用于汽车挡风玻璃、室外窗户玻璃、眼镜镜片以及手机屏幕等。材料的透光性与表面疏水性能
Interface structure of TaN/ReB2 multilayers was investigated using first-principles based on density functional theory (DFT). Twelve different interface configurations of TaN(100)/ReB2(001) were chose
In order to investigate the characteristics of force chains in granular flow system, a parallel plate shear cell was constructed to simulate the shear movement of the infinite parallel plate and obser
Combinatorial methodology has been proven to be a powerful tool in exploring novel materials because of its effectiveness in accelerating fabrication efficiency and optimization for searching function
石墨烯基高分子纳米复合材料由于其优异的物理化学性能而受到广泛的关注.然而,石墨烯片层间存在π-π键相互作用,使得石墨烯在高分子基体中难以均匀分散.本文中,我们利用聚2-丁基苯胺(P2BA)作为分散剂,通过使用红外、拉曼、紫外和XPS的表征证明石墨烯通过π-π键相互作用在多种溶剂中稳定分散.石墨烯环氧复合涂层由环氧树脂、P2BA功能化的石墨烯和聚酰胺固化剂制备.我们通过电化学测试表征环氧涂层的防腐蚀
Titanium diboride was deposited on the surface of nickel coated copper electrode by electro sparking. The performances of the as-coated electrode during spot welding galvanized steel were analyzed. Th