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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Vacuum deposition methods for placing soft, thin metal gold film on metal surfaces for lubrication purposes - vapor deposition, sputtering, and ion plating
Bearing and lubricants for high speed rotating machinery operating in hard vacuum
Temperature limitations of polyphenyl ethers, esters, and hydrocarbon base lubricants in small bore ball bearings
Mechanical properties of lubrication system components in vacuum environment
Space lubrication problems, molybdenum disulfide films for heavily loaded gears, and ball bearing protection from contamination
Numerical method for treating time transient gas lubrication equation
Theory, equipment and design considerations for microfog lubricant for advanced turbine engine components
Materials for use as rolling-contact bearing lubricants in liquid hydrogen environment
Lubrication and bearing problems in space environment, noting molybdenum disulfide and silicones
Self-lubricating properties of composites of porous nickel and nickel-chromium alloy impregnated with barium fluoride-calcium flouride eutectic
Ball bearing life operating in vacuum with molybdenum disulfide and oils as lubricant
Space vehicle lubrication methods, noting design and construction of test apparatus
Presentation documenting surface characterization of a loss-of-lubrication test conducted at NASA Glenn Research Center.
About 97% of lubricant base oils are currently sourced from petroleum and the majority of the rest is produced from vegetable oils. We demonstrate a promising catalytic route to produce base oils from lignocellulosic biomass-derived 2-alkylfurans and ketones via carbon–carbon coupling in neat conditions. Among several homogeneous and heterogeneous acid catalysts tested, a perfluorinated sulfonic acid (Aquivion PW79S) exhibits the best catalytic performance and yields up to 90% renewable furan-containing base oils with the use of a thiol promotor. The effects of the acid strength of the catalysts, molecular size and structure of thiols and ketones, and fraction of thiols are studied. Electronic structure calculations elucidate the reaction pathway and indicate that the thiol reduces the barrier of the rate-determining dehydration step. The structure and properties of base oils can be tuned by using different synthons. Here, these base oils have excellent properties and can be competitive with or surpass the commercial synthetic alkylnaphthalene and furan-containing bio-ester base oils.
Oil-miscible and oil-transparent organic modified ZnS nanoparticles were developed as an antiwear additive to improve lubricant performance.
The aim of this project was to develop scalable methods to convert plastic waste to petrochemical-equivalent feedstocks and demonstrate their utility in lubricant base oil and wax applications. These objectives were partially accomplished, by scaling up the synthesis of platinum-on-strontium titanate catalysts to twenty gram batches, scaling up the conversion of plastic waste to twenty-five grams of plastic, producing high-melt waxes and characterizing their properties, and demonstrating the purification of high-melt waxes. High-melt waxes are one petrochemical-equivalent feedstock that can be made from plastic waste, consisting of a hard wax with a melt point above 65 C. They are used as ingredients in hot melt adhesives, coatings, and cosmetics. Producing a petrochemical-equivalent feedstock from plastic waste provides an advantage in lower carbon footprint and manufacturing cost, as the waste feedstock costs less than crude oil.
Five different mixtures of molybdenum disulfide are found to be effective bearing lubricants when tested at very low pressures and high temperatures.
An ohmmeter is used as a sensor to determine when the lubricating oil in a high speed journal bearing becomes depleted.