纳米级正十六烷润滑膜分子排列方式的实验研究  

Experimental Study on Molecular Arrangement of Nanoscale N-hexadecane Lubricant Films

作　　者：张韶华[1,2] 雒建斌[1] 刘宇宏[1] 

机构地区：[1]清华大学摩擦学国家重点实验室,北京100084 [2]北京控制工程研究所空间轴承应用实验室,北京100190

出　　处：《润滑与密封》2015年第12期1-6,78,共7页Lubrication Engineering

基　　金：国家自然科学基金项目(51335005;51321092)

摘　　要：针对厚度为纳米量级的液体正十六烷润滑膜,在球-盘点接触区内的分子排列结构开展实验研究。采用自行研制的在线测量系统,基于偏振拉曼光谱技术和相对光强膜厚测量技术分析处于不同润滑状态下的润滑膜分子排列结构和成因。结果表明:接触区内十六烷静态液膜的分子主链平行于固体表面,但在摩擦平面内的取向随机分布;较低速度下液膜分子排列结构与静态液膜相近;进入弹流润滑状态后,液膜分子排列结构呈无序的流体状态;在膜厚处于薄膜润滑阶段时,液膜分子有沿滚动速度方向取向的趋势。Experimental study on the molecular arrangement of n-hexadecane liquid was carried out in a lubricating point contact area at the nano-scale.A measurement system was developed using the techniques of polarized Raman spec- troscopy and relative optical interference intensity.The molecular arrangement and the origin were studied under different lubricating states.The results indicate that the molecules in the static n-hexadecane film lying parallel to the solid surfaces and the molecular orientation is random in plane. Hexadecane molecules show a similar molecular arrangement as static condition when the rolling speed is low.When the rolling speed is high, the spectral results show that the molecular orienta- tion is disordered like bulk liquid.Hexadecane molecules are organized into a shear-induced orientation under thin film lu- brication state.

关 键 词：分子排列 偏振拉曼光谱 在线测量 纳米尺度 

分 类 号：TH117.2[机械工程—机械设计及理论]