Materials Literature
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Silicon carbide ceramics are candidate materials for use in aggressive environments, including those where aqueous acids are present. Standard corrosion testing methods such as immersion testing are not always sufficiently sensitive for these ceramics owing to the very low, almost unobservable, corrosion rates encount…
In this investigation a stable high manganese austenitic steel, 0.45C-17Mn-2.8Al, has been studied for hydrogen embrittlement using cathodically precharged specimens. Tensile testing of axisymmetric and plane strain specimens precharged with hydrogen show an appreciable loss of 8-10% reduction in area (RA) whereas the…
The crystal structure of a unique cholic acid inclusion compound with acetone and water guests exhibiting extensive hydrogen bonding is reported and the phases formed during decomposition identified by thermal analysis and X-ray powder diffraction.
The porphyrin boronate H2L2 undergoes Suzuki cross-coupling reaction with β-monobromoporphyrin H2L1 to give the unsymmetrically substituted porphyrin dimer H4L3 in high yield; homo-, and heter-bimetallic complexes of H4L3 are prepared.
The long duration mechanical strength of rods used in composite insulators is a major problem for the line designer. The previous approach to the problem and the requirements of standards give an extrapolation for the long term performance of the rod which is not confirmed by accurate analysis of test results. So, a n…
As a normal part of reactor operation, Zircaloy components in the core of boiling water reactors (BWRs) are subjected to oscillating loads. It then becomes important to assess the fatigue behavior of core materials. These include Zircaloy-2 used as fuel cladding, zirconium used as liners in barrier fuel, and Zircaloy-…
Summary not available.
The structure of alkaline earth vanadate glasses, xMO⋅(100-x)V2O5 (M=Ca, Sr, Ba, x=30, 40, 45, 50, 55), has been investigated by means of 51V static and magic angle spinning (MAS) NMR spectroscopies. The 51V NMR spectral parameters of various constituent vanadate groups contained in the vanadate glasses were determine…
Magnetic and magneto-optical properties, Kerr rotation angle, Kerr ellipticity and reflectance, were investigated for Pt substituted MnSb compound films with film thickness of about 1000 /spl Aring/ by RF sputtering in the concentration range of 44 at%>
The polymorphism of a novel and orally effective uricosuric agent, [3-(4-bromo-2-fluorobenzyl)-7-fluoro-2,4-dioxo-1,2,3,4-tetrahydro-quinazolin-1-yl] acetic acid, designated as FR76505, was characterized by X-ray powder diffractometry and thermal analysis. In the crystalline state, FR76505 exists in at least three pol…
The microstructural characteristics of quasicrystalline and related crystalline phases in rapidly solidified Al[sbnd]5 to 20 at% Fe alloys have been investigated by detailed transmission electron microscopy. Rapid solidification of Al[sbnd]5 to 20 at% Fe alloys produces a variety of metastable phases, depending upon a…
High-refractive-index glasses of heavy-metal oxides have large optical non-linearities which make them promising for optoelectronic applications. This paper describes the fabrication and characterization of the xBi2O3–PbO–B2O3–(52–x)GeO2(BPBG) glass system with x= 10, 15, 20, 30 and 35. The BPBG glasses were melted in…
In this work three types of the surface formate, ionic, monodentate and bidentate species, are identified to be the main products of formic acid adsorption on Cu, CuCl, Cu2O and CuO at room temperature. Combined thermal analysis [differential thermal analysis (DTA), thermogravimetry (TG) and evolved gas analysis (EGA)…
A novel, highly active, supported liquid-phase, rhodium catalyst for acetylene hydrochlorination for mercury free production of vinyl chloride is described.
A frequency dependent resistance model for the representation of eddy current losses in the windings of three-phase, two or three windings, transformers is presented. It consists of a low order R, L Foster circuit connected in series with any existing transformer model to produce the realistic damping that results fro…
The influence of bicarbonate ions on the stability of copper oxides and pitting corrosion has been studied by the combined use of long term exposure, X-ray diffractometry (XRD), scanning electron microscopy (SEM), and atomic absorption spectroscopy (AAS). Contrary to earlier suggestions that the increasing concentrati…
Sulfiding corrosion induced by the action of consortia containing sulfate-reducing bacteria (SRB) in biofilms is a problem with most common engineering materials. It is now possible to use a model based on basic thermodynamic reasoning and information on complexation and alteration kinetics to make some predictions ab…
Sintered bodies of (Ba, Pb)2In2O5 were prepared by substituting A site of Ba2In2O5 having a brownmillerite-related structure with Pb. Crystal structure and conductivity of sintered (Ba, Pb)2In2O5 were investigated. The crystal structure of (Ba, Pb)2In2O5 was governed by the Pb content, and changed from orthorhombic to…
The step-polymerization reaction between monoamines and diepoxide has been investigated by measuring the permittivity and dielectric loss as a function of reaction time, tre, at different temperatures. Hexylamine and cyclohexylamine were used both in stoichiometric and non-stolichiometric (amine-rich) compositions wit…
The connection between cleanliness of semiconducting compounds and water tree growth at the semiconductor-dielectric interface was demonstrated. Changes to semiconducting compounds have improved the reliability of solid dielectric cables.>