Effect of humidity and a wettability additive on polyphenyl ether boundary lubrication of steel in air and nitrogen to 350 ̊C
William R. Jones, William F. Hady, Lewis Research Center, United States. National Aeronautics and Space Administration
National Aeronautics and Space Administration, 1970 - Technology & Engineering - 16 pages
A pin-on-disk sliding friction apparatus was used to determine the effect of humidity and a wettability additive on boundary lubrication of steel in air and nitrogen with a polyphenyl ether. Poor wettability was observed for the ether in dry nitrogen from 150Oto 200' C (302' to 392' F) and high wear also occurred in this temperature range. The wettability additive improved the wetting and decreased wear of the ether in dry nitrogen. It increased wear in wet air and had little effect on wear in wet nitrogen and dry air. A relative humidity of 50 percent decreased wear in nitrogen and had little effect on wear in air.
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00 Disk temperature 1-hour test 1-kilogram load 17-meter-per-minute surface additive in dry additive In wet additive on boundary air and nitrogen appears in figure base fluid boundary lubrication Coefficient of friction complete wetting Contact Angle disk temperature range dry air 100 dynes per centimeter effect of humidity effect on wear ether in dry figures 3(a five-ring polyphenyl ether fluid in dry fluid with additive four atmospheres halogenated organic acid high wear Lewis Research Center little effect lower wear lubrication of steel M-50 tool steel NASA TN nitrogen 20 ppm nitrogen and dry nitrogen from 150 occurred in wet organic acid type pin-on-disk sliding friction Poor wettability poor wetting condition ppm H20 pyrometer relative humidity Rider wear sliding friction apparatus steel in air surface tension temperatures of 150 test atmospheres test specimens thermocouple Unlubricated data vane pump wear for polyphenyl wear in wet wet and dry wet nitrogen wettability was observed Zisman