Engineering topics
Publications and source records attributed to Probst, H. B..
Reusable surface insulation is considered a prime candidate for heat shielding large areas of the space shuttle vehicle. The composition and fabrication of RSI materials are discussed, followed by evolution of RSI and current problems, physical and thermal properties, arc plasma test data and results, and material improvement research. Finally, a summary of RSI technology status is presented.
Arc jets tests of thoria dispersed nickel base alloys and cobalt base alloys for space shuttle metallic thermal protection system
Seven thoria dispersed nickel base alloys and one cobalt base alloy, candidates for the Metallic Thermal Protection System for the Space Shuttle Vehicle, were tested simultaneously in an arc jet at a nominal test temperature of 1366 deg K (2000 deg F) and pressure of 0.01 atmospheres. The degradation of the materials after 50 one half-hour cycles in the arc jet simulating Space Shuttle entry conditions was determined utilizing techniques including X-ray diffraction, metallography, and electron beam microprobe.
Evaluation of high gas velocity and static oxidation behavior of fused-salt-aluminided IN 100 between 1038 and 1149 C
Results of cyclical tests of TD nickel (2% thoria-dispersed nickel) and TD nickel chromium (2% thoria-dispersed nickel-20% chromium alloy) 1.5 mm (60 mil) sheet specimens for susceptibility to hot corrosion in a Mach 0.5 gas stream of Jet A-1 fuel combustion products containing 2 ppm sea salt. Tests as long as 500 one-hour cycles between room temperature and specimen hot zone temperatures of 899 C (1650 F), 982 C (1800 F), and 1149 C (2100 F) were performed. Evidence of hot corrosion was found for both materials in the 899 C (1650 F) and 982 C (1800 F) tests, but not at 1149 C (2100 F). It was concluded that because of high metal thickness losses neither alloy in sheet form is suitable for long-time engine application in a hot corrosion environment at temperatures of 982 C (1800 F) or above.
High temperature mechanical properties of polycrystalline hafnium carbide containing 13- volume-percent hafnium diboride
Solubility range of 75 atomic percent vanadium- gallium system to determine phases in equilibrium and ascertain presence or absence of superconductivity
High temperature behavior and properties of refractory materials such as molybdenum, tungsten, silicides, aluminides and carbides
Borides of transition metals, hafnium, zirconium, niobium, lanthanum and holmium tested for hardness at high temperature
Vanadium-gallium system in region of V-3Ga studied by X-ray diffraction and metallography techniques
Room-temperature slip in zone-melted tungsten single crystals - plastic deformation
Microstructures in tantalum-carbon system
Observations on twinning in zone-refined tungsten