两种典型二维材料的制备及其摩擦学性能研究

发布时间：2018-05-09 05:24

本文选题：球磨 + 氟化石墨烯　；参考：《兰州理工大学》2017年硕士论文

【摘要】：随着石墨烯的出现,二维材料(石墨烯、氟化石墨稀、二维二硫化钼等)成为近年来的研究热点。其中,氟化石墨烯是石墨烯的一种新型衍生物,而具有类石墨烯结构的二硫化钼纳米片是指由单层或几个原子层所构成的片状二硫化钼材料。二维材料具有独特的结构特征以及与传统材料截然不同的性能,比如优异的机械性能以及独特的光、电、磁学等特性,在界面科学、纳米电子器件、润滑材料等领域都具有广阔的应用前景。本论文工作主要从氟化石墨烯和二维二硫化钼纳米片的制备及其作为润滑添加剂的摩擦学性能研究两个方面展开,主要研究内容及结果如下:1.以氟化石墨、二硫化钼为原料,采用湿法球磨的方法分别剥离制备了氟化石墨烯和二维的二硫化钼纳米片。为了防止球磨过程中所制备纳米片的二次团聚,加入了一定量的聚乙烯吡咯烷酮(PVP)作为分散稳定剂。当球磨速度达到300r/min时,可获得少层的氟化石墨烯和二硫化钼纳米片。2.将所制备的氟化石墨烯和二硫化钼纳米片分别分散在乙醇中,并对其摩擦学性能进行了测试,结果表明氟化石墨烯和二硫化钼纳米片的添加均可以显著改善乙醇的摩擦学性能。3.将所制备的氟化石墨烯和二硫化钼纳米片作为润滑油添加剂分别添加到基础油聚α烯烃-8(PAO-8)中,测试其添加量对润滑油摩擦学性能的影响。结果证明二者均具有优异的摩擦学性能;对于氟化石墨烯,当其添加量为0.30 mg/ml时,润滑油的磨损率降至纯基础油的34%;而对于二硫化钼纳米片,当添加量为0.20 mg/ml时,润滑油的磨损率降至纯基础油的50%。其作用机理为:纳米片随着摩擦过程的进行,不断吸附在摩擦副表面,在摩擦剪切力和法向载荷的共同作用下,纳米片之间发生相对滑动,在摩擦副表面形成一层连续且牢固的薄片状物理吸附膜,阻隔了两个摩擦副之间的直接接触,从而起到抗磨损的作用。
[Abstract]:With the appearance of graphene, two-dimensional materials (graphene, graphite fluoride dilute, two-dimensional molybdenum disulfide, etc.) have become the research hotspot in recent years. Among them, graphene fluoride is a new derivative of graphene, and molybdenum disulfide nanocrystalline with graphene like structure is a sheet molybdenum disulfide material composed of monolayer or several atomic layers. Two-dimensional materials have unique structural characteristics and distinct properties from traditional materials, such as excellent mechanical properties and unique optical, electrical, magnetic and other characteristics, in interface science, nano-electronic devices, Lubrication materials and other fields have a broad application prospects. In this paper, the preparation of graphene fluoride and two-dimensional molybdenum disulfide nanoparticles and their tribological properties as lubricating additives are studied. The main contents and results are as follows: 1. Graphite fluoride and molybdenum disulfide nanoparticles were prepared by wet ball milling with graphite fluoride and molybdenum disulfide as raw materials. In order to prevent the secondary agglomeration of the nanoparticles prepared during ball milling, a certain amount of polyvinylpyrrolidone (PVP) was added as the dispersion stabilizer. When the milling speed reaches 300r/min, a few layers of graphene fluoride and molybdenum disulfide nanocrystalline. 2 can be obtained. The tribological properties of graphene fluoride and molybdenum disulfide nanoparticles were tested. The results showed that the addition of graphene fluoride and molybdenum disulfide nanoparticles could significantly improve the tribological properties of ethanol. The prepared graphene fluoride and molybdenum disulfide nanoparticles were added to the base oil polyolefin-8 PAO-8 as lubricating oil additives respectively, and the effect of the addition amount on the tribological properties of lubricating oil was tested. The results show that both of them have excellent tribological properties, for graphene fluoride, the wear rate of lubricating oil decreases to 34% of pure base oil when the addition amount is 0.30 mg/ml, while for molybdenum disulfide nanocrystals, when the addition amount is 0.20 mg/ml, the wear rate of lubricating oil decreases to 34% of pure base oil. The wear rate of lubricating oil is reduced to 50% of pure base oil. The mechanism is as follows: with the process of friction, the nanoparticles are continuously adsorbed on the surface of the friction pair. Under the joint action of the friction shear force and the normal load, there is a relative sliding between the nanoparticles. On the surface of the friction pair, a continuous and firm thin sheet physical adsorption film is formed, which prevents the direct contact between the two pairs and thus plays the role of anti-wear.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.1

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