Abstract: In order to study the lubrication characteristics of the MoS2/815Z, MoS2/RP4751 and MoS2/RIPP4758 solid-liquid composite lubrication systems under vacuum boundary lubrication conditions, vacuum reciprocating sliding friction  test and vacuum spiral orbit tribometer(SOT) test studies were carried out on three solid-liquid composite lubrication systems. Scanning electron microscope(SEM) and X ray energy dispersion spectrometer(EDS) analysis were performed on the surface of the ball-disk friction pair after the SOT test. The test results show that the selective combination of solid-liquid lubricants in the MoS2/815Z and MoS2/RIPP4758 composite lubrication systems may well combine the advantages of solid-liquid lubricants during the friction processes, which is beneficial to the formation of transfer film and boundary lubrication film. The average lubrication life of MoS2/815Z reaches 2327 cycle/μg, which is greater than the sum of the lubrication life of solid and liquid lubricants. MoS2 film and RP4751 liquid lubricant may not combine the advantages of solid-liquid lubricant well. It is not easy to form an effective transfer film and boundary lubrication film during the friction processes, which makes the film consume a lot in a short time. The surface of the friction pair is in a state of depleted oil, which eventually leads to a rapid increase in the friction factor and lubrication failure of the MoS2/RP4751 composite lubrication system.

Key words: space rotating parts, solid-liquid composite lubrication, long life, boundary lubrication

摘要： 为研究MoS2/815Z、MoS2/RP4751和MoS2/RIPP4758三种固液复合润滑体系在真空边界润滑工况下的润滑特性，对三种固液复合润滑体系进行了真空往复滑动摩擦试验和真空螺旋轨道摩擦(SOT)试验研究，并对SOT试验后的球盘摩擦副平盘表面进行扫描电镜(SEM)和X射线能量色散谱仪(EDS)分析。试验结果表明，MoS2/815Z和MoS2/RIPP4758复合润滑体系中的固液润滑剂间为选择性结合，在摩擦过程中能够很好地发挥固液润滑剂的优势，有利于对偶转移膜和边界润滑膜的形成，MoS2/815Z的平均润滑寿命达到了2327 圈/μg，大于固体润滑剂和液体润滑剂的润滑寿命之和。MoS2薄膜与RP4751液体润滑剂复合后不能很好地发挥固液润滑剂各自的优势，在摩擦过程中不易形成有效的对偶转移膜和边界润滑膜，并且使得薄膜在较短的时间内大量消耗从而造成摩擦副表面处于乏油状态，最终导致MoS2/RP4751复合润滑体系的摩擦因数快速增大和润滑失效。

关键词: 空间转动部件, 固液复合润滑, 长寿命, 边界润滑