Materials Literature
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The well-known effects of dissolved oxygen and hydrogen in respectively increasing and reducing the corrosion rate of zircaloys irradiated in high temperature water have been attributed to changes in the course of water radiolysis.1 Computer simulation of the growth and decay of radioly tic species produced by β, γ an…
Tension and Charpy V-notch specimens of the base metal, heat-affected zone metal, and weld metal from the beltline region of the Maine Yankee pressure vessel (Type A533B-1 steel) were irradiated in an accelerated surveillance capsule. The specimens were exposed to a fluence of 1.3 × 1019 neutrons (n)/cm2 (>1 MeV) at 5…
Potential-pH curves for electrodeposited 80% Sn-Cu alloy in aerated buffer solutions of pH values ranging from 0.9 to 11.3 show linearity within the range of pH 4.4 to 11.3. The electrode behavior is governed by the Sn(OH)4/Sn(OH)2 system. For the deaerated buffer solutions, the bheavior of the alloy coincides approxi…
The electrical properties of Fe2O3-doped BaTiO3 ceramics are found to be remarkably dependent on the sintering temperature. Interactions between firing temperature and grain growth, temperature dependence of permittivity, dielectric loss, ferroelectric hysteresis, Curie temperature and field dependence of permittivity…
.The preparation, and properties of glass-fibrereinforced alloys' have been studied. The composites were prepared by the hot (720-820 K) extrusion of pressed billets, consisting ofa mixture of metal powder and glass particles. The softening-point of the glass used was· below..the temperature of extrusion, hence the gl…
The relation between the corrosion cracking of ammonia spherical storage tanks and the quality of liquid ammonia, which changed with the manufacturing processes, was studied by means of the analysis of impurities in the liquid ammonia and corrosion cracking tests for WOL type specimens 80 kg/mm2 high strength steel. T…
The morphology and substructure of Ti–Cu martensites containing 1, 2 and 5.3 wt%Cu were investigated by means of optical microscopy and transmission electron microscopy. Surface relief studies prove that the transformation of three Ti–Cu alloys during water-quenching is essentially martensitic. Detailed examinations e…
The i.r. spectrum of silver nitrate has been studied as a function of temperature up to 184.5°C and at pressures up to 40 kbar in a diamond anvil cell. The characteristic features of phases I, II and III are reported. The spectra, and presumably the structures, of AgNO3(II) and (III) are similar to those of KNO3(I) an…
Protactinium monocarbide has been prepared by carbothermic reduction of the pentaoxide. It reacts with iodine (400 °C), bromine (350 °C), and thionvl chloride (200 °C) in evacuated sealed vessels to vield the approoriate pentahaiibe. The tetraiodide, Pal4, is obtained by interaction of the monocarbide with either prot…
The abrasive wear of machine components used in mining, mineral dressing, and earth moving machinery has long been recognized as a major problem in material design. This problem has been studied on a laboratory scale using four types of tests which simulate abrasion conditions ranging from severe gouging wear to low-s…
The importance and relevance of adopting the technique of fast firing of ceramics to the country's needs have been discussed. The advantages, the scope of the technique and the equipment such as kilns, conveyors, controllers etc and the fuels used have been indicated along with the firing schedules followed.
Abstract An iterative solution process combined with the penalty function method employed in constrained variational priciples is described. As an example of the use of the method an axi‐symmetric plate with the complementary energy formulation is considered.
Measurements of birefringence, light scattering, second harmonic light generation and scattering have been made simultaneously at the α-β transition of quartz. They have been correlated with a coexistence zone (observed visually) of α and β phases in the hysteresis region and with Dauphine twinning.
Interatomic and intermolecular ordering in amorphous polymers can be characterized by radial distribution functions (RDF) derived from radiation scattering measurements (X-rays, neutrons, etc.). The type of information which may be derived from RDF data in monatomic systems is illustrated by measurements on a sample o…
Variable-temperature (4·2–270K) magnetic susceptibility, e.s.r., and single-crystal X-ray crystallographic data are presented to show that a predominantly dz2 CuII ground state can lead to appreciable magnetic exchange interactions via the extended bridges in [Cu2(Et5dien)2(C2O4)][BPh4]2, [Cu2(Me5dien)2(N3)2][BPh4]2,…
It has been suggested that the poisonous emissions from spark ignited internal combustion engines can be reduced by lowering the combustion temperature. Combustion under the lean mixture is one way to lower the combustion temperature. To make the engine operate under the lean mixture, a new stratified charge combustio…
An investigation has been made of the movement of conducting particles, under the action of the applied electric field, on the surface of an insulating spacer immersed in SF6 between 0.47 and 1.5 MPa. Spheres moved fairly readily but particles of an irregular geometry, such as filings, did not. Movement was more prono…
A three-dimensional X-ray structure analysis by the heavy-atom method of 2SbCl3·C6H4Me2 is described. Crystals are monoclinic, space group P21/c, a= 9.13(4), b= 8.44(2), c= 12.79(4)Å, β= 125.35(20)°, Z= 2. Least-squares refinement of photographic data led to R 0.11 for 920 independent reflections. The structure is ess…
Trials to enhance the decarburization and the denitrogenization of molten Fe-Cr alloys were made by blowing plasma jet of argon-hydrogen gas mixture on to the surface of molten metals. The weight of melts was 1 to 3kg, the gas blowing rate 8 t/min and the electric power consumption 15 to 30kVA. The final concentration…
119 Sn Mössbauer spectra have been recorded for a number of ternary sulphides isolated from the systems Na2S–SnS2, BaS–SnS2, and PbS–SnS2. The series includes compounds of known crystal structure such as Na4SnS4, Na6Sn2S7, the high- and low-temperature forms (HT and LT) of Ba2SnS4, and Ba3Sn2S7, all of which contain t…