纳米级稠化剂颗粒沉积膜在乏脂润滑中的作用机制研究

发布时间：2018-12-25 08:21

【摘要】：利用双光束干涉法对点接触区乏脂润滑成膜特性规律以及接触区附近润滑剂的微观迁移特性进行了观测.在试验条件下,接触区会经历充分润滑—乏脂—沉积膜润滑—分离油润滑等润滑状态.借助原子力显微镜,探测到沉积膜是润滑脂的稠化剂被碾压破碎而沉积在滚压轨道表面的一层纳米级颗粒薄膜;而分离油是在剪切过程中润滑脂内逐渐释放基础油.试验初始,接触区周围的润滑脂池因乏脂而迅速消失,但分离油会逐渐形成"第二相油池"以实现回流补给.沉积膜增大了基础油在滚动轨道表面的接触角,阻碍回流补给,但其会随运动逐渐磨损,此后分离油将进入接触区补充润滑膜.初步发现,当分离油不充足时,沉积膜有利于保护润滑轨道.
[Abstract]:The characteristics of oil-poor lubrication film formation and the microscopic migration characteristics of lubricant near the contact area were observed by two-beam interferometry. Under the experimental conditions, the contact zone will undergo the lubrication state such as full lubrication, lack of grease, deposition film lubrication and separation oil lubrication. With the help of atomic force microscope, it is found that the deposited film is a layer of nano-particle film deposited on the surface of rolling track due to the crushing of the thickener of grease, while the separated oil is gradually released from the base oil in the grease during the shearing process. At the beginning of the experiment, the grease pool around the contact area disappeared rapidly because of lack of grease, but the separated oil would gradually form a "second phase oil tank" to realize reflux and recharge. The deposited film increases the contact angle of the base oil on the surface of the rolling track, hinders the reflux supply, but it will gradually wear away with the movement, after which the separated oil will enter the contact area to replenish the lubrication film. It is preliminarily found that when the separation oil is not sufficient, the deposited film is beneficial to the protection of the lubricating track.
【作者单位】：中国计量科学研究院;清华大学摩擦学国家重点实验室;福斯(中国)有限公司;
【基金】：中国博士后科学基金(2016M600112) 科技部国家重点研发专项(2016YFA0200901) 摩擦学国家重点实验室开放基金(SKLTKF16B12,SKLTKF16B13)资助~~
【分类号】：TH117.2

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