‘Corrosion resistance of technical ceramics’
"‘Corrosion resistance of technical ceramics’." British Corrosion Journal, 27(1), p. 25
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Thermal degradation of polybutadiene, 2. Overall thermal behaviour of polymers with different microstructures
Abstract The thermal decomposition at volatilization temperatures of polybutadiene samples with different initial microstructures was investigated i. vac. and under nitrogen atmosphere by thermogravimetry, differential scanning calorimetry, thermal volatilization analysis and infrared spectroscopy. The decomposition o…
Development of a B4C/Al Cermet for Use as an Improved Structural Neutron Absorber
Abstract An aluminum and boron carbide cermet was evaluated for possible application as a neutron absorbing material where structural strength and rigidity will be required. The boron carbide/aluminum composite possessed unique continuous interconnected ceramic and metal phases. Traditional bocon containing neutron ab…
Ein Germaniumsesquisulfid der Zusammensetzung (tBuGe)4S6 ohne Adamantanstruktur
Zwei schwefelverbrückte, nahezu planare Ge 2 S 2 ‐Vierringe liegen im neuartigen Sesquichalcogenid 1 vor, das, sich bei der Umsetzung von t uGeCl 3 mit (NH 4 ) 2 S 5 bildet. 1 lagert bei thermischer Belastung in das bereits bekannte ( t BuGe) 4 S 6 ‐Isomer mit Adamantangerüst um. Wird dieses direkt aus t BuGeCl 3 und…
Effect of Work Roll Materials and Progress of Manufacturing Technology on Cold Rolling and Future Developments in Japan.
As the fundamental tools in the cold rolling, work rolls have been greatly affected on the quality, production cost and productivity. The issue of the technological innovation about work roll manufacturing have been changed from the original, which was concerned with steel making and ingotting techniques for minimizin…
Pressure-induced phase transformations in alkali-metal hydrides calculated using an improved linear-muffin-tin-orbital–atomic-sphere-approximation energy scheme
A scheme for the calculation of total energies from first principles is described which is intermediate between the popular linear muffin-tin-orbital method in the atomic-sphere approximation (LMTO-ASA) and an exact full-potential treatment. The local-density total energy is evaluated accurately for the output charge…
Spectroelectrochemical observation of poly(benzo[c]thiophene) n- and p-doping
The deposition and properties of electropolymerised poly(benzo[c]thiophene)(PBCT) films have been studied using in situ UV–VIS spectroscopy. Film stability is enhanced by ‘conditioning’ in background electrolyte [0.2 mol dm–3 tetraethylammonium tetrafluoroborate (TEAT)–CH3CN]; this involves a single potential cycle be…
The Effect of Phosphorus on the Radiation-Induced Microstructure of Stabilized Austenitic Stainless Steels
This paper deals with the correlation of irradiation behavior and microstructural evolution of mono-(Ti) and multi-(Ti, Mb, V) stabilized Type 316 (UNS S31600) stainless steels with different phosphorus levels. These steels, in the 20% cold-worked condition, were irradiated between 400 and 500°C up to 100 dpa in the P…
Evaluation of properties and special features for high-temperature applications of rhenium
Sixty‐six years have passes since rhenium was discovered in June 1925 by husband‐and‐wife team Walter and Ida Noddack. The rapid development of rhenium is due to the unique properties of the metal and its alloys. Rhenium has a hexagonal close packed structure as opposed to the body centered cubic structure of other re…
The Effects of Relative Humidity on Some Physical Properties of Modern Vellum: Implications for the Optimum Relative Humidity for the Display and Storage of Parchment
The effects of different relative humidities on some physical properties of three types of calfskin parchment (vellum) were investigated. Standard samples were subjected to (1) tensile fracture, and (2) measurement of the force that developed when the restrained samples were subjected to step decreases in relative hum…
Infrared Absorption Coefficients of Silica Glasses
The absorption coefficient values of several silicate glasses in the IR radiation range were determined. Four methods were employed in this study: (1) direct transmission by CO 2 laser, (2) direct transmission through ultrathin sections using an IR spectrometer, (3) glass particle dispersions in KBr pressed pellets, a…
Investigations of Tribological Characteristics of Solid Lubricants Exposed to Atomic Oxygen
At low earth orbit (LEO) altitudes of 100–1000 km, pressures are relatively high (10−5 Pa) and the residual atmosphere consists primarily of atomic oxygen (AO). Spacecraft orbital velocities, approximately 8 km/sec, at LEO altitudes result in a reactive chemical environment with 5eV AO. Long-term (10–30 years) operati…
Modulation of Tc–NX (X = O or S) bonds by π-acceptor ligands
Transfer of a sulfur atom from S2Cl2 to cis-[TcN(Cl)(phen)2]PF6(phen = 1,10-phenanthroline) yields cis-[Tc(NS)Cl(phen)2]PF6, which crystallizes in the triclinic space group, P(no. 2), with cell parameters a= 9.850(3), b= 16.293(3), c= 8.349(2)Å, α= 100.06(2), β= 93.84(3) and γ= 106.96(3)°. The Tc–NS bond length is 1.7…
On the Inhomogeneity of Refractive Index of CaF2 Crystals for High Performance Optics
Abstract CaF 2 ‐crystals belong to the standard materials, used in optical precision instruments. As well as the traditional optics for microscopy new developments in the field of DUV‐lithography (projecting lenses made out of CaF 2 and quartz) need a homogeneity of the refractive index in the order of 10 −6 , but ove…
Radiopacity and Physical Properties of Titanium-polymethacrylate Composite
Titanium-polymethacrylate composite was prepared as an x-ray-opaque filler for composite core materials. The base monomers of the composite were 2,2-bis [4-(3-methacryloyloxy-2-hydroxypropoxy) phenyl] propane (Bis-GMA) and triethyleneglycol dimethacrylate (TEGDMA). Pure titanium powder was used as a radiopaque element…
Temperature- and axial-ligand-dependent EPR spectra of cobalt porphyrin cation radicals: effects of mixing of the A1u and A2u states and a locally excited triplet state
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature- and axial-ligand-dependent EPR spectra of cobalt porphyrin cation radicals: effects of mixing of the A1u and A2u states and a locally excited triplet stateSatoh Minoru, Yasunori Ohba, Seigo Yamauchi, and Masamoto IwaizumiCite this: Inorg. Chem. 1992, 31, 2, 298–…
Development of Cobalt Free Wear Resistant Alloys for Nuclear Applications
The major source of shutdown radiation in PWR plant is the 60 Co radio nuclide generated from Stellite alloys used for wear resistance in the circuit. Initial attempts to replace cobalt based alloys with materials based on the nickel-chromium-boron system were unsuccessful in prototype testing. A galling test applied…
Structural phase transitions in [(C2H5)4N]2MX4crystals
A number of compounds of the chemical formula [(C2H5)4N]2MX4 exhibit structural phase transitions in the temperature range 200–300 K, which were found in calorimetric investigations. Dielectric measurements on pellet samples confirmed the existence of the phase transitions and ferroelectricity in [(C2H5)4N]2 MnCl4 has…
Corrosion Mechanisms for Copper and Silver Objects in Near-Surface Environments
The morphology and mineralogy of corrosion products found on copper and silver artifacts recovered from shallow land or water burial are reviewed. Stability diagrams are used to interpret mechanisms for corrosion phenomena with an emphasis on identification of microbiological action.
Fluoride glasses : synthesis and properties
The discovery of heavy metal fluoride glasses has opened new prospects for fiber optics operating beyond 2 µm with expected losses less than 10(-2) dB/Km. The main interest of fluoride glasses lies in their infrared transmission up to 8 µm in the bulk form and 4.5 µm for optical fibers. We have reported here the prepa…