An unbranched perfluoropolyether is the current ball bearing lubricant for deep space flight. We report measurements of viscosity to moderate pressures for the calculation of pressure-viscosity coefficients to temperatures as low as −40°C. A free volume model predicts that a minimum pressure-viscosity coefficient exists at higher temperature. The existence of a minimum is confirmed by viscometry at temperatures to 180°C.
The Pressure-Viscosity Coefficient of a Perfluorinated Polyether Over a Wide Temperature Range
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division December 14, 1999; revised manuscript received March 22, 2000. Associate Editor: J. Fre^ne.
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Bair, S. (March 22, 2000). "The Pressure-Viscosity Coefficient of a Perfluorinated Polyether Over a Wide Temperature Range ." ASME. J. Tribol. January 2001; 123(1): 50–53. https://doi.org/10.1115/1.1310160
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