The friction and wear behavior of seven space lubricants was investigated under boundary lubrication conditions using a vacuum four-ball tribometer. Three of the lubricants were perfluoropolyethers (143AC, S-200, and Z-25). Three were synthetic hydrocarbons (a multiply alkylated cyclopentane, 2001a), and a formulated version with an antiwear and an antioxidant additive (2001). The third hydrocarbon was an unformulated polyalphaolefin (PAO-100). An unformulated silahydrocarbon (SiHC) was also evaluated. Test conditions included: a pressure less than 6.7 x 10(exp 4) Pa, a 200 N load, a sliding velocity of 28.8 mm/sec (100 RPM), and room temperature (approx. 23 C). The wear rate for each lubricant was determined from the slope of wear volume as a function of sliding distance. The lowest wear rate (0.033 x 10(exp-9) cu mm/mm) was obtained with the silahydrocarbon. The formulated synthetic hydrocarbon had a wear rate off O.037 x 10(exp -9)cu mm/mm, which was a 36% reduction compared to the unformulated fluid. The polyalphaolefin had the highest wear rate of the non-PFPE fluids. Of the perfluoropolyethers (PFPEs), wear rates decreased by about 50% from Z-25 (1.7 x 10(exp -9)cu mm/mm) to S-200 (0.70 x 10(exp -9)cu mm/mm) to 143AC (0.21 x 10(exp -9)cu mm/mm).
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机译：使用真空四球摩擦计在边界润滑条件下研究了七种空间润滑剂的摩擦和磨损行为。其中三种润滑剂是全氟聚醚（143AC，S-200和Z-25）。三类是合成碳氢化合物（一种多烷基化的环戊烷，2001a），另一种是带有抗磨剂和抗氧化剂的配方（2001年）。第三烃是未配制的聚α-烯烃（PAO-100）。还评估了未配制的硅烷烃（SiHC）。测试条件包括：小于6.7 x 10（exp 4）Pa的压力，200 N的负载，28.8毫米/秒的滑动速度（100 RPM）和室温（约23 C）。每种润滑剂的磨损率由磨损量的斜率与滑动距离的函数确定。硅碳氢化合物的磨损率最低（0.033 x 10（exp-9）cu mm / mm）。配制的合成烃的磨损率为O.037 x 10（exp -9）cu mm / mm，与未配制的流体相比降低了36％。在非PFPE流体中，聚α烯烃的磨损率最高。在全氟聚醚（PFPE）中，磨损率从Z-25（1.7 x 10（exp -9）cu mm / mm）降低到S-200（0.70 x 10（exp -9）cu mm / mm）降低了约50％至143AC（0.21 x 10（exp -9）cu mm / mm）。
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