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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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Silicone rubber gasket and an alumina gasket retain a vacuum inside a high temperature EMF cell in which higher and lower density liquid metal electrodes are separated by an intermediate density fused salt electrolyte. This innovation is in use on a sodium bismuth regenerable EMF cell in which the fused salts and metals are at about 500 deg to 600 deg C.
Effect of surface roughness and spray powders on shear bond strength of plasma-sprayed alumina coatings on stainless steel
Effect of particle size distribution and surface roughness on shear bond strengths of alumina coatings
Plasma sprayed alumina particle size and purity, and stainless steel surface roughness effects on coating-substrate bond strength
Effect of varying percentages of constituent elements in alumina dispersion-strengthened copper-nickel alloys, listing creep rupture properties
Manganese oxide effect on kinetics and mechanics of sintering of alumina powder compacts
Tritiated alumina, prepared by exchange of the surface hydroxyl groups with tritiated water, is a suitable reagent for exchange-labeling of specific compounds in low concentrations prior to chromatographic analysis. In a chromatographic column, it detects and measures submicrogram quantities of material.
Friction and wear properties of various alumina bearings for use in gas lubricated gyros
Matrix of manganese-alumino-silicate glass simplifies the processes of metallizing alumina ceramics. Because the manganese in the glass is preoxidized to the 2 plus state by firing in nitrogen, the ceramic can be metallized in dry hydrogen. Lengthening the firing time permits a lower metallizing temperature.
Friction and wear properties of alumina bearings for use in gas-lubricated gyroscopes
Alumina and beryllia ceramics compatibility with potassium vapor, discussing modes of attack and low silica level
Structural changes on reheating plasma sprayed alumina free standing shapes, noting polymorphic transformations effect on porosity and pore size distribution
Pressure and temperature dependence of isotropic elastic moduli of polycrystalline alumina, noting Gruneisen parameter, equation of state and Debye temperature
Silicate glass impurity droplet formations on alumina single crystals polished surfaces analyzed by electron microprobe as function of high temperature
Curve characteristics of differential thermalgram of high alumina allophane, observing endothermal peak for water loss
Prolonged electrical test of bonded alumina trilayer at 1325 K in vacuum environment
Feasibility of crystal growth technique for beta alumina membrane from molybdenum, tungsten, and iridium
An investigation was conducted to determine whether a nickel - 2-volume-percent alumina dispersion-strengthened material with a fine, uniformly distributed dispersoid could be produced, which was equivalent in short time tensile strength to commercially available thoriated sheet materials. Comminution and blending with a modified triple stirrer attritor and a hydrogen and vacuum precleaning treatment prior to consolidation were used. A product with a fine dispersoid with an average particle size of 0.04 micron and an interparticle spacing of 0.7 micron was achieved. This material has a 1093 C (2000 F) short time tensile strength of 117 MN/sq m (16 900 psi).