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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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X-ray diffraction of sintered nickel oxide charged electrode, structural effect of initial stand at various temperatures, and comparison with cobalt doped positives
PbTe-W and PbTe-Ta, SnTe-Ta equilibria, nonmagnetic bonding of pure PbTe and 3N powder to sintered pellets, and design and construction of furnace and lapping machine
Electrochemical behavior of fiber plaque materials compared with nickel powder sinter plaques in study to develop cadmium electrodes for sealed secondary batteries
Sintered W and W plus additive billets used to test feasibility of producing fiber-bearing composites by elongation during extrusion
Sublimation rates of pressed-and-sintered lead telluride and lead stannous telluride thermoelements
A group of silicide coatings developed for the T222 tantalum-base alloy have afforded over 600 hours of protection at 1600 and 2400 F during cyclic exposure in air. These coatings were applied in two steps. A modifier alloy was applied by slurry techniques and was sintered in vacuum prior to siliciding by pack cementation in argon. Application of the modifier alloy by pack cementation was found to be much less effective. The addition of titanium and vanadium to molybdenum and tungsten yielded beneficial modifier alloys, whereas the addition of chromium showed no improvement. After siliciding, the 15Ti- 35W-15V-35Mo modifier alloy exhibited the best performance; one sample survived 1064 hours of oxidation at 2400 F. This same coating was the only coating to reproducibly provide 600 hours of protection at both 1600 and 2400 F; in the second and third of three experiments, involving oxidation of three to five specimens at each temperature in each experiment, no failures were observed in 600 hours of testing. The slurry coatings were also shown to protect the Cb752 and D43 columbium-base alloys.
Polarization curve of silver anode in ammoniacal electrolyte - Effective electrolytic surface area of sintered silver electrodes - Ultrasonic vibration effects on oxidation of electrode
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
Determination of effective electrolytic surface area of sintered and foil silver electrodes subjected to oxidation at various current densities in ammoniacal medium
Tungsten and molybdenum alloy silicide slurry applied and vacuum sintered on tantalum and niobium alloys for protection from oxidation
Reaction of sintered silver electrode to oxidation and reduction
Magnetic logic circuit design features two ferrite materials, with different formulation and magnetic characteristics, which are bonded into a continuous structure by preparing the materials as a slurry and using the doctor blade method to form flexible ferrite sheets. After firing, the sintering process was continuous across the bond.
Special technique for applying silicide coatings to refractory metal alloys improves their high-temperature protective capability. Refractory metal powders mixed with a baked-out organic binder and sintered in a vacuum produces a porous alloy layer on the surface. Exposing the layer to hot silicon converts it to a silicide.
To measure vacuum pressures in the range of 5 times 10 to the minus 7 to 5 times 10 to the minus 16, a semiconductor resistor composed of sintered zinc oxide is used. Through the effect of surface absorbed gases on the resistance of the semiconductor material, very low pressures are measured.
New method makes solid ion exchange membrane electrolytes for use in hydrocarbon-oxygen and hydrogen-oxygen fuel cells. The membrane is a sintered composite of zirconia, phosphoric acid, and zeolite.
Improved cleaning retort produces uniform temperature distribution in the heated zone and minimizes hydrogen channeling through the powder bed. Retort can be used for nonmetallic powders, sintering in a reducing atmosphere, and for cleaning powders in reduction atmospheres other than hydrogen.
Adding calcium increases uniformity of grain growth over a wide range of sintering temperatures and reduces porosity within the grain. Ferrite cores containing calcium have square hysteresis loops and high curie temperatures, making them useful in coincident current memories of digital electronic computers.
Sintering of carbonyl nickel powders for nickel cadmium batteries fabrication