Abstract: In order to widen the working temperature range of space liquid lubricants, reduce its volatility under high vacuum conditions, improve its lubrication performance and prolong its the space lubrication life, a new kind of space lubricating oil based on silahydrocarbon was designed and synthesized. The various compositions were studied, and a space lubricating oil named RIPP?4758 was developed. All the performance tests were compared with perfluoropolyethers (PFPEs) and multiply-alkylated cyclopentane (MAC), which were widely used in space machinery. The results showed that RIPP 4758 space lubricant had outstanding viscosity-temperature performance, low temperature performance, low volatility and lubrication performance. The application results showed that RIPP 4758 could be applied to a wider working temperature range, high vacuum resistance, and good lubrication and wear resistance.

Key words: silahydrocarbon, space lubricant, longer service life, wider temperature range, boundary lubrication