离子液体基磁流体的制备及其在外场中的润滑特性研究

项目名称： 离子液体基磁流体的制备及其在外场中的润滑特性研究

项目编号： No.51475241

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 黄巍

作者单位： 南京航空航天大学

项目金额： 80万元

中文摘要： 离子液体具有零蒸气压、高热稳定性及宽液程等独特性质。而磁流体是一类可通过外磁场加以控制、定位的胶体。针对空间液体润滑剂的挥发与爬移损耗等共性问题，本研究提出以离子液体为基载液，合成离子液体基磁流体；通过界面电/磁物理吸附的方式将其精确定位于润滑界面，实现对润滑过程的物理调控。合成过程中，着力分析离子电荷屏蔽作用对磁流体稳定性的影响。而在爬移及润滑特性研究方面，主要探讨磁流体内的磁性颗粒及阴阳离子与电/磁界面间的作用机制及吸附强度评价方法，获得抑制润滑剂爬行的关键因素；同时分析界面润滑剂爬移对摩擦性能的影响，在此基础上建立利用外场对润滑剂进行调控补偿的新型润滑方法。本研究将为减缓或抑制空间液体润滑剂的挥发和爬移流失提供新的设计思路。

中文关键词： 空间环境；离子液体；磁流体；爬移；润滑

英文摘要： Ionic liquids display unique physicochemical properties such as negligible vapor pressure, high thermal stability and liquid state in a broad temperature range. And ferrofluids are colloidal liquids, which can be positioned and retained in object region by external magnetic field. To overcome the space lubricant volatilization and migration, we proposed to synthesize an ionic liquid-based ferrofluid for the space environment and realize the control of lubrication by applying external electric and magnetic fields. During the preparation process, much attention is paid to the effect of charge screening on the stability of ferrofluid. In order to obtain the key factor of anti-creep, the absorbing mechanism as well as the evaluation method for absorbing strength between the magnetic particles/ion and external fields on the interface are discussed. The effect of the lubricant creep on frictional property is studied. Last but not least, a design for lubricant compensation based on external fields is built. This research will provide a new idea for retarding and controlling the volatilization and creep of liquid lubricant in space systems.

英文关键词： space environment;ionic liquids;ferrofluid;migration;lubrication