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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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The sintering behavior of a mixture of hafnium carbide and 10 weight percent cobalt powders is presented. Compacts were heated in a vacuum at elevates temperatures for densification and removal of the cobalt. Densities of 99 percent of theoretical for the hafnium carbide were achieved with a maximum sintering temperature of 2200' C. Retained cobalt, grain size, microhardness, and weight loss were determined.
In this report we obtain further data about the distribution of bubbles in glass. It gives the results obtained from the microscopic study of obsidian samples heated with an oxyacetylene torch and from powdered microscopic slide glass re-fused in an electric oven. This report continues our earlier study of the distributions: Badri Aghassi, 1961, B.U. Tektite Project, Research Report No. 11.
Very lossy powdered iron material, in the lining of a polyester resin, replaces the dielectric material in the short coaxial transmission line of a simple filter. The lossy material absorbs microwave signals along high voltage power supply leads.
In order to eliminate the hazard caused by residual air trapped between the concentric shells of a cryostat, these annular spaces are pressurized with helium gas. This system is more economical than the use of powdered insulation maintained at low vacuums.
Powdered-rock theory of lunar surface material, proposing that the surface is composed of a mat of needle crystals resulting from impact phenomena
Effect of weight, density, and heat load on performance of heat shield of phenolic resin and nylon powder
Mechanical and thermal properties of rock powders as lunar surface simulators
Pair of encased low permeability hand gloves between which an inert gas circulates reduces dry box contamination. This innovation is applicable to dry boxes using radioactive and alkali metal compounds, submicron powders, and liquid metals.
Half patterns cast from commercial epoxy resin containing aluminum powder are used for shell-molding of aluminum parts. The half patterns are cast in plastic molds of the original wooden pattern. Ten serviceable sand resin molds are made from each epoxy pattern.
Boron carbide whiskers have an excellent combination of properties for use as a reinforcement material. They are produced by vaporizing boron carbide powder and condensing the vapors on a substrate. Certain catalysts promote the growth rate and size of the whiskers.
The solar wind is described and its effects on surfaces are reviewed. Experimental results are given for materials subjected to simulated solar-wind bombardment. Among the effects discussed are sputtering-type erosion, chemical reaction with paint vehicles and reduction of oxide pigments, and production of lunar-surface optical characteristics in a basalt powder.
Venusian and Martian nitrogen and carbon dioxide atmosphere as combustible medium for metallic powders, examining heat evolution per unit mass
Thermal conductivity of solid, porous and powder rocks and minerals at subnormal temperatures and pressures with respect to lunar surface material
Refractory coating protects graphite heater elements operating at high temperature in a hydrogen atmosphere. The coating is formed by painting the graphite elements with a composition containing powdered tungsten, and heat-treating it.
Adhesive cured at room temperature provides an effective adhesive bond over the range from room temperature down to the temperature of liquid hydrogen. The adhesive consists of one part of 200-mesh powdered nylon filler to two parts of an epoxy-polyamine resin.
Standard compositions suitable for electron probe microanalysis of various silicates are prepared by coprecipitation of specified salts with colloidal silica to form a gel which is decomposed into a powdered oxide mixture and compressed into thin pellets. These pellets of predetermined standard are compared with a silicate sample to determine its composition.
Refractory tubing is warm drawn over a solid ductile mandrel with a powder parting compound packed between mandrel and the tubes inner surface. This method applies also to the coextrusion of a billet and a ductile mandrel.
Method for recovering powdered silver-palladium braze alloy from an acrylic spray binder and rubber masking adhesive used in spray brazing is devised. The process involves agitation and dissolution of masking materials and recovery of suspended precious metal particles on a filter.