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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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Effects of production & fabrication variables on notch strength of aluminum-tin-titanium alloy at liquid hydrogen temperature
Solid-state diffusion process bonds lead telluride and lead telluride-tin telluride thermoelectric elements to tungsten electrodes. The resulting bond is nonmagnetic and has high strength and low electrical and thermal resistance. This method is also used with tantalum electrodes.
Threaded fasteners used in corrosive environments are plated with electroless nickel and electroplated, over the nickel, with tin. This provides a corrosion-resistant coating for the fasteners.
Electric current capability of high field superconductors at high temperatures - niobium zirconium, niobium tin and niobium titanium
Lubricating materials for use in a vacuum environment have been the subject of a series of experimental investigations. Evaporation properties were evaluated for solid polymeric compositions. Friction and wear studies explored the behavior during sliding contact for series of polymeric compositions, binary alloys containing soft film-forming phases, complex alloys with film-forming materials, and a burnished MoS2 film. Friction and wear experiments were conducted at 10(exp-9)mm Hg with a 3/16-inch-radius-hemisphere rider specimen sliding on the flat surface of a rotating 2-1/2-inch-diameter disk specimen with materials that had low rates of evaporation. The influence of fillers in polytetrafluoroethylene (PTFE) on decomposition during vacuum friction studies was determined with a mass spectrometer. A real advantage in reducing decomposition and improving friction wear properties is gained by adding fillers (e.g., copper) that improve thermal conductivity through the composite materials. A polyimide and an epoxy-MoS2 composition material were found to have better friction and wear properties than PTFE compositions. A series of alloys (cast binary as well as more complex alloys) that contained microinclusions of potential film-forming material was studied. These materials replaced the normal surface oxides as they were worn away on sliding contact. Iron sulfide, nickel oxide, and tin are typical film-forming materials employed and were demonstrated to be effective in inhibiting surface welding and reducing friction. A burnished MoS2 film applied to type 440-C stainless steel in argon with a rotating soft wire brush had good endurance properties but somewhat higher friction than commercially available bonded films. An oil film applied to the burnished MoS2 markedly reduced its endurance life.
Optical and photoelectric properties of thin tin films in vacuum UV
The heats of solution in liquid tin of pure praseodymium, pure neodymium and nine praseodymium-neodymium binary alloys have been measured using liquid metal solution calorimetry. A plot of the measured heat effect for the alloys as a function of composition is linear, with the terminal points being the measured values for the pure components. This linear dependency indicates that the heat of mixing in the binary praseodymium-neodymium system is zero within experimental error, and therefore the binary alloys obey one of the criteria for an ideal solution.
Diffusion bonding of tungsten electrodes to lead tellurium and lead tellurium-tin tellurium thermocouples
Hydrogen-temperature effect on mechanical properties of titanium-aluminum-tin alloy
Low effective resistivity of gold film plated onto tin determined by low temperature microwave absorption measurement and explained by free- electron model and superconductivity proximity effect
Tensile stress effect on critical current-carrying capacity of niobium-zirconium wire and niobium-tin ribbon superconductors at liquid helium temperature
Electronic contribution to 9 GHz ultrasonic attenuation studied in thin tin films at low temperatures
Electron transmission measurements for aluminum and gold, and backscattering measurements on targets of iron, tin, aluminum, and gold
Thermal sterilization effects and application parameters determined for connector cup joints soldered with tin and antimony
Sleeve bearings of DU material consisting of thin bronze spheres lining surrounded by mixture of TFE fluorocarbon plastic and lead sintered on tin plated steel backing
Nuclear radiation effects on aluminum, titanium, vanadium, and tin alloys at cryogenic temperature
The heats of solution of silver and gold in dilute Ag-Au-Sn alloys have been determined as a function of alloy composition using liquid metal solution calorimetry. From the values obtained, the various enthalpy interaction parameters in the liquid solutions have been calculated. The results are interpreted in terms of the probably bonding changes taking place between silver, gold and tin atoms.
Vacuum evaporated tin microscopic particles on carbon substrate used as standard for electron microscope alignment