Materials Literature
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Artificially creviced Alloy 22 (N06022) is susceptible to crevice corrosion in presence of high chloride aqueous solution when high temperatures and high anodic potentials are applied. The presence of oxyanions in the electrolyte, especially nitrate, inhibits the nucleation and growth of crevice corrosion. Crevice cor…
In this contribution, the degradation of solid oxide fuel cells (SOFC) is accelerated by means of high current load cycles. The ageing phenomena are studied and characterised by material analyses. The results show that degradation of cell performance is mainly caused by the delamination of the cathode layer. The accum…
Kompositwerkstoffe aus Diamant und Siliciumcarbid sind in ihrem Anwendungsumfang gegenwärtig wegen der hohen Herstellungskosten begrenzt. In diesem Beitrag werden experimentelle Untersuchungen vorgestellt, die die Basis für eine andere Herstellungsmethode bilden. Statt durch hohen Druck wird der Kompositwerkstoff durc…
Mathematical modeling aiming at SOFC design and operating condition optimization is conducted at the Forschungszentrum Jülich. Computational Fluid Dynamics (CFD) software is used for three dimensional (3D) stack modeling and a rapidly executing self-written one dimensional (1D) code for calculating "along-the-channel"…
The title compound, [La(BTC)(H2O)6]n 1 (H3BTC = benzene-1,3,5-tricarboxylic acid), has been synthesized by the hydrothermal reaction of La(NO3)3?3H2O with H3BTC and Na2CO3, and its structure was determined by single-crystal X-ray diffraction. The crystal structure is of monoclinic, space group Cc with a = 11.5289(3),…
Electrical field and stress distribution calculation was made on two typical 500kV rod composite string insulators with similar working conditions using limited element processing. The results shows severe field distortion at conductor and earthing top of insulator which stress is in more than 10 times higher than at…
The characteristics and components of textures in magnesium alloys were presented. The mechanism of the formation and evolution of textures during plastic deformation such as extrusion, rolling, equal channel angle extrusion processes and annealing were reviewed, followed by the analysis of the effects of textures on…
Al2O3-doped ZnO (AZO) thin films have been deposited onto glass substrates using a split target consisting of AZO (1 wt%) and AZO (2 wt%) by pulsed laser deposition with an ArF excimer laser (λ = 193 nm, 15 mJ, 10 Hz, 0.75 J/cm2). By applying a magnetic field perpendicular to the plume, the lowest resistivity of 8.54…
Abstract A well characterised grade of mica was used to prepare nickel‐coated mica fillers by an electroless coating technique. These fillers were incorporated into polypropylene (PP) and acrylonitrile‐butadiene‐styrene (ABS) using a Haake Internal mixer and a two‐roll mill to produce conducting composites suitable fo…
Phase change RAM (PRAM) is a promising memory that can solve the problems of conventional memory - scalability, write/read speed and reliability. The process technologies for the integration of high density PRAM are reviewed. The most important challenge of PRAM is the reduction of writing current. Various approaches…
Abstract In former studies of the preparation of polypropylene(PP)‐clay nanocomposites, different types of layered silicates were used. However, the obtained results were not comparable due to different preparation conditions and types of silicates. The aim of this work was the investigation of the influence of differ…
The influence of undersized solute additions on radiation-induced segregation (RIS) at grain boundaries was examined for austenitic model alloys. High-purity Fe-15Cr-20Ni alloys, doped with either 0.5 mass% silicon or 0.025 mass% phosphorus, were exposed to electron irradiation at several temperatures in a high-voltag…
It is well known that water tree propagation in XLPE cable is significantly influenced by inorganic impurities in water. Therefore, we investigated both changes in concentration and deviation of isotopic content of inorganic elements in XLPE samples by water tree experiments in a clean environment. The concentration o…
The vector-valued Allen-Cahn equations are combined with elasticity where a linear stress-strain relationship is assumed. A short physical derivation of the generalised model is given and global existence and uniqueness of the solution are shown under suitable growth conditions on the nonlinearity.
An on-line, nonintrusive monitoring system, able to observe the aging of an AC machine winding insulation is described. The principle of this system, which operates on external magnetic field measurements, consists of detecting small variations of the inter-turn capacitances due to the dielectric aging. The authors ha…
We discuss a few recent developments that are important for understanding of MHD turbulence. First, MHD turbulence is not so messy as it is usually believed. In fact, the notion of strong nonlinear coupling of compressible and incompressible motions along MHD cascade is not tenable. Alfvén, slow and fast modes of MHD…
Novel phase shifter structures have been suggested, simulated, and designed. The phase shifters are based on a connection of transmission line sections with positive and negative dispersion. Use of a combination of such sections allows designing miniature microwave devices operating in a wide frequency range. Differen…
Applicability of a solution model for calculating salt's solubility in binary solvent mixtures was shown. The accuracy of the proposed model was evaluated by computing mean percentage deviation (MPD) employing available solubility data of electrolytes in binary solvents at various temperatures from the literature. The…
Three-layer films were prepared with polyethylene (PE) and poly(ethylene terephthalate) (PET) films as the outer layers and a film of high-density polyethylene (HDPE)/ethylene-methyl acrylate-glycidyl methacrylate (E-MA-GMA) terpolymer blend as the inner layer using compression molding. E-MA-GMA, an elastomer containi…
CdSe quantum dots (QDs) have been synthesized continuously at 200–320°C using a micro-flow reactor. Instead of the usual tri- n -octylphosphineoxide (TOPO)-tri- n -octylphosphine (TOP) solvent, octadecene (ODE)-oleic acid-TOP mixed solvent was used in the present study. Because the ODE-oleic acid-TOP solvent is in liq…