潤滑油添加剂制备和性能研究.doc

毕业论文 润滑油添加剂制备和性能研究 专业班级：轮机管理12班 姓 名： 李树元 指导教师： 孙德平 轮机工程学院 摘 要 润滑油添加剂时一种具有良好的减摩抗磨性能、较高的承载能力以及对摩擦表面有良好的修复性能的材料。近几十年来，国内外的许多学者对于各种不同纳米材料作为润滑油添加剂所起到的减摩抗磨性能都进行了研究。本文主要研究了二硫化钼作为润滑油添加剂的摩擦学性能。 首先采用机械球磨法制备微纳米级的二硫化钼粉末，利用Bettersize2000激光粒度分析仪对微纳米二硫化钼添加剂进行了表征，并配置出不同质量分数二硫化钼的润滑油。然后在摩擦磨损试验机对制备的纳米二硫化钼粉末的摩擦学特性进行了初步研究，通过对摩擦系数及磨损量的分析，发现添加了纳米二硫化钼的润滑油润滑性能明显优于纯润滑油，并得出纳米二硫化钼的减摩耐磨机理为：纳米二硫化钼表面能较高，易吸附在摩擦副表面，形成一层润滑薄膜；另外，粒径较小的纳米微粒能够填补摩擦表面的沟槽，且它本身具有自修复作用。以上因素综合减小了摩擦，修复了摩擦表面，从而提高了润滑油的抗磨减摩性能。 关键词：二硫化钼；摩擦学性能；抗磨减磨 Abstract Oil additive is a kind of material with good antiwear properties, high load-carrying capacity and self-repair of the worn surface. The tribological properties and mechanisms of various materials as oil additives were investigated in the decades. This thesis studies the tribological properties of molybdenum disulfide as lubricating oil additives. First, molybdenum disulfide nano-powder can be achieved by the mechanical ball -milling method, then molybdenum disulfide nano-powder is characterized by laser particle size analyzer Bettersize2000 and molybdenum disulfide lubricants should be prepared. Then abrasion testing machine will be used to make a preliminary research on the properties of the prepared nano-powder. Through analysis on friction Coefficient and abrasion loss, it is proved that the lubricant oil with molybdenum disulfide nano-powder as the addictive has obvious advantage over pure lubricant oil. The abrasion-resistance mechanism of the molybdenum disulfide nano-powder is that it has high surface energy which can easily adhere to the friction surface as a film of lubricant oil, and that the nano-powder can fill in the grooves on the friction surface and the powder has self-repairable ability. The above comprehensive factors result in the reduction of friction and repairness of the surface, which consequently improve the friction and abrasion resistance of lubricant oil. Keywords：molybdenum disulfide ；tribolo