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Abstract
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 perfluo-ropolyethers (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 polyal-phaolefin (PAO-100). An unformulated silahydrocarbon (SiHC) was also evaluated. Test conditions included: a pressure <6.7 × 10−4 Pa, a 200N load, a sliding velocity of 28.8 mm/sec (100 rpm), and room temperature (∼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 × 10−9 mm3/mm) was obtained with the silahydrocarbon. The formulated synthetic hydrocarbon had a wear rate of 0.037 × 10−9 mm3/mm, which was a 36 percent 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 percent from Z-25 (1.7 × 10−9mm3/mm) to S-200 (0.70 × 10−9 mm3/mm) to 143AC (0.21 × 10−9 mm3/mm).
Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Toronto, Ontario, Canada, October 26–28, 1998
Notes
Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Toronto, Ontario, Canada, October 26–28, 1998