KSC Lubricant Testing Program
National Aeronautics and Space Administration, 1973 - Lubrication and lubricants - 80 pages
A program was conducted to evaluate the performance of various lubricants in use and considered for use at Kennedy Space Center (KSC). The overall objectives of the program were to: (1) determine the lubrication characteristics and relative corrosion resistance of lubricants in use and proposed for use at KSC; (2) identify materials which may be equivalent to or better than KELF-90 and Krytox 240 AC greases; and (3) identify or develop an improved lubricating oil suitable for use in liquid oxygen (LOX) pumps at KSC. It was concluded that: (1) earth gel thickened greases are very poor corrosion preventive materials in the KSC environment; (2) Halocarbon 25-5S and Braycote 656 were suitable substiutes for KELF-90 and Krytox 240 AC respectively; and (3) none of the oils evaluated possessed the necessary inertness, lubricity, and corrosion prevention characteristics for the KSC LOX pumping systems in their present configuration.
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TEST RESULTS AND DISCUSSION
Table Page 20 Nonspecification Perfluoroalkylpolyether FluidBased Greases 35
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0/3 Water Washout 01 Steel Block 1,003 Hours Exposure 2,542 Hours Exposure 4-Ball Wear Tests 60 cycles Aluminum Shear Test AMOCO Bearing in Bottle Block on LFW-1 Block Wear Scar Block Weight Loss Cabinet Corrosion Test Cleaning 2,542 Hours control TABLE Copper on Oxidation Corrosion Test Panels Dow Corning Corp Dropping Point E.I. du Pont Effect of Copper Equivalent to control Figure Fluoro gm-cms grease film Halocarbon Products Corp Hooker Chemical Humidity Cabinet Corrosion Hydrocarbon Joe Lockhart Krytox 240 AC Last Non-Seizure Load LFW-1 Wear Test Load Carrying Capacity Low Temperature Torque Lubricated SAE 01 Mean Hertz Load mgms Military Specification Mobil Oil Corp Molybdenum Disulfide N/m2 Loss Oxidation Stability Panels after Cleaning Performance in Corrosion Rating Code Roller Bearing Royal Lubricants Running Torque SAE 01 Steel Salt Spray Chamber Salt Spray Corrosion Significantly worse Silica Spray Corrosion Test Starting Torque Temp visible corrosion Wear and Load worse than control