These fluids are composed entirely of cations and anions, particles of opposite charge that display strong polarity and form ionic bonds. Ionic liquids (ILs) are interesting lubricant candidates for machine elements in space. The results corroborate the beneficial lubricating performance of incorporating P-SiSO in MAC, under vacuum as well as under various atmospheres, and demonstrates the feasibility for use as a multifunctional additive in hydrocarbon base oils, for use in space exploration applications. Heritage space lubricants-MAC and perfluoroalkyl polyethers (PFPE)-were employed as references. Thermal vacuum outgassing and electric conductivity were meas- ured to evaluate ‘MAC & P-SiSO’ compatibility to the space environment, including the secondary effects of radiation. The tribological properties under vacuum or various atmospheres (air, nitrogen, carbon dioxide) were measured and analyzed. In this work, we evaluated hydrocarbon-mimicking ionic liquids, designated P-SiSO, as performance ingredients in multiply alkylated cyclopentane (MAC). Under such circumstances, effective lubrication requires the formation of adsorbed or chemically reacted boundary films to prevent excessive friction and wear. Ensuring sufficient liquid lubricant supply under space conditions is challenging, and consequently, such tribological systems may operate in boundary lubrication conditions.

Low vapor pressure and several other outstanding properties make room-temperature ionic liquids attractive candidates as lubricants for machine elements in space applications.

How to make space on mac air