Far-infrared studies of silicate minerals.
Far IR reflection spectra of silicate mineral at room and liquid nitrogen temperatures
SILICON COMPOUND↗
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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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Emissivity coatings for low-temperature space radiators Quarterly progress report no. 1, 1 Jul. - 30 Sep. 1965
Emissivity coatings for low temperature spacecraft radiators
COATING↗
An Advanced Thermoelectric Component Development Program Interim Progress Report
Computer program for thermoelectric generator analysis - feasibility of segmenting silicon germanium and lead telluride materials - thermal insulation and support structure development
LEAD TELLURIDE↗
Instruction manual for epitaxial apparatus
Instruction manual for apparatus using programmer operation of electronic valves for etching and growth of single crystal silicon, deposition of silicon dioxide, and nucleation site treatment
MANUAL↗
Magnetic behavior of high-saturation core materials at high temperatures and frequencies up to 3200 cps.
High saturation core material magnetic behavior, noting structural instability accompanied by deteriorating magnetic properties at high temperatures
MAGNETIC PROPERTY↗
Isolation of components on a silicon wafer using SiO2
Isolation of components on silicon wafer by groove etching and silicon dioxide deposition
ISOLATION↗
Recovery of vegetative bacteria from eccofoam FP and diatomaceous earth
Serratia marcescens cells used to study survival and viability in plastic materials and diatomaceous earth
CONTAMINATION↗
Influence of high temperatures on the strength of solidified resins and materials based on resins
Temperature effects on strength of phenol formaldehyde, phenol phosphorus, melamine formaldehyde, and organosilicon resins
ORGANIC SILICON COMPOUND↗
Far-infrared studies of silicate minerals.
Far IR reflection spectra of silicate mineral at room and liquid nitrogen temperatures
REFLECTED RAY↗
A method for optically coupling a 5'' photomultiplier tube.
Optical coupling of photomultiplier tube to acrylic plastic using clear silicone potting compound
PHOTOMULTIPLIER↗
Checking Surface Contours
Rubber impressions viewed with optical comparator. Simple mold constructed from aluminum sheet or any other easily shaped material compatible with silicone rubber ingredients. Mold placed over surface to be measured. Newly-mixed silicone rubber compound poured in mold and allowed to cure.
Velega, D.↗
Documentation of ice shapes accreted on the main rotor of a UH-1H helicopter in level flight
Icing tests were conducted on a UH-1H helicopter in level flight behind a spray tanker near Duluth, Minnesota, during the winter of 1983-84 as part of the joint NASA/Army HIFT program. On landing, the ice formations on the main rotor were documented by casting a set of ten-inch molds on the blade using a Dow-Corning silicone rubber compound which was initially liquid at sub-freezing temperatures. Such documentation was accomplished for eight flights in which the temperature ranged from -11 C to -22 C and the in-cloud flight times ranged from 5 to 9 minutes.
Hanson, M. K.↗
The behavior of SiC and Si3N4 ceramics in mixed oxidation/chlorination environments
The behavior of silicon-based ceramics in mixed oxidation/chlorination environments was studied. High pressure mass spectrometry was used to quantitatively identify the reaction products. The quantitative identification of the corrosion products was coupled with thermogravimetric analysis and thermodynamic equilibrium calculations run under similar conditions in order to deduce the mechanism of corrosion. Variations in the behavior of the different silicon-based materials are discussed. Direct evidence of the existence of silicon oxychloride compounds is presented.
Marra, John E.↗
Surface analysis of anodized aluminum clamps from NASA-LDEF satellite
Surface analysis results of selected anodized aluminum clamps containing black (Z306) and white (A276) paints which received nearly six years of Low Earth Orbit (LEO) exposure on the Long Duration Exposure Facility are reported. Surface analytical techniques, including x-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and scanning electron microscopy/energy dispersive analysis by x-ray (SEM/EDAX), showed significant differences in the surface composition of these materials depending upon the position on the LDEF. Differences in the surface composition are attributed to varying amounts of atomic oxygen and vacuum ultraviolet radiation (VUV). Silicon containing compounds were the primary contaminant detected on the materials.
Grammer, H. L.↗
Surface characterization of selected LDEF tray clamps
The surface characterization of chromic acid anodized 6061-T6 aluminum alloy tray clamps has shown differences in surface chemistry depending upon the position on the Long Duration Exposure Facility (LDEF). Water contact angle results showed no changes in wettability of the tray clamps. The overall surface topography of the control, trailing edge(E3) and leading edge(D9) samples was similar. The thickness of the aluminum oxide layer for all samples determined by Auger depth profiling was less than one micron. X-ray photoelectron spectroscopy (XPS) analysis of the tray clamps showed significant differences in the surface composition. Carbon and silicon containing compounds were the primary contaminants detected.
Cromer, T. F.↗
A Two Phase HfB2-SiB4 Material
A two phase HfB2-SiB4 material which is useful as a high temperature oxidation resistant coating. This invention relates to ceramic coatings and more particularly to ceramic coatings containing metal borides. Boride materials are known to have good oxidation resistance, with HfB2 considered to be the best pure boride for oxidation applications. It has been shown that the addition of 10 to 20 percent SiC to HfB2 increases the oxidation resistance. The HfB2-SiC materials are prepared by hot pressing powder mixtures. Hot pressing powder mixtures has limited ability to produce fine grained multiphase materials due to particle coarsening during the sintering process. Additionally, the purity of the final monolithic structure is limited to the purity of the starting powders. Chemical vapor deposition (CVD) offers a method of producing highly pure multiphase ceramics, with better control of microstructure. Researchers have tried to produce HfB2-SiC coatings by CVD but without success.
SILICON COMPOUNDS↗
Observations of chemical processing in the circumstellar environment
High resolution interferometer and single-dish observations of young, deeply embedded stellar systems reveal a complex chemistry in the circumstellar environments of low to intermediate mass stars. Depletions of gas-phase molecules, grain mantle evaporation, and shock interactions actively drive chemical processes in different regions around young stars. We present results for two systems, IRAS 05338-0624 and NCG 1333 IRAS 4, to illustrate the behavior found and to examine the physical processes at work.
NASA Program Exobiology↗
Experimental Investigation of Elastomer Docking Seal Compression Set, Adhesion, and Leakage
A universal docking and berthing system is being developed by the National Aeronautics and Space Administration (NASA) to support all future space exploration missions to low-Earth orbit (LEO), to the Moon, and to Mars. An investigation of the compression set of two seals mated in a seal-on-seal configuration and the force required to separate the two seals after periods of mating was conducted. The leakage rates of seals made from two silicone elastomer compounds, S0383-70 and S0899-50, configured in seal-on-seal mating were quantified. The test specimens were sub-scale seals with representative cross-sections and a 12 inch outside diameter. The leakage rate of the seals manufactured from S0899-50 was higher than that of the seals made from S0383-70 by a factor of 1.8. Similarly, the adhesion of the 50 durometer elastomer was significantly higher than that of the 70 durometer compound. However, the compression set values of the S0899-50 material were observed to be significantly lower than those for the S0383-70.
Daniels, Christopher C.↗