期刊
MOLECULES
卷 26, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/molecules26041013
关键词
space-tribology; tribofilm; silicate boundary film; multiply alkylated cyclopentanes (MAC); anti-wear; friction modifier; lubricant additive; conductivity improver
资金
- Taiho Kogyo Research Foundation (TTRF)
- Austrian COMET-Program InTribology1 [872176]
The study evaluated the performance of P-SiSO in MAC as a lubricant, demonstrating its beneficial lubricating properties in space environments and feasibility as a multifunctional additive.
Low vapor pressure and several other outstanding properties make room-temperature ionic liquids attractive candidates as lubricants for machine elements in space applications. Ensuring sufficient liquid lubricant supply under space conditions is challenging, and consequently, such tribological systems may operate in boundary lubrication conditions. Under such circumstances, effective lubrication requires the formation of adsorbed or chemically reacted boundary films to prevent excessive friction and wear. In this work, we evaluated hydrocarbon-mimicking ionic liquids, designated P-SiSO, as performance ingredients in multiply alkylated cyclopentane (MAC). The tribological properties under vacuum or various atmospheres (air, nitrogen, carbon dioxide) were measured and analyzed. 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. Heritage space lubricants-MAC and perfluoroalkyl polyethers (PFPE)-were employed as references. 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.
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