Materials Literature
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Abstract In order to model macrosegregation, one must consider convection and the partitioning of the segregating elements at the dendritic length scale. This article describes microsegregation with diffusion in the solid. It presents a continuum model of macrosegregation and illustrates the simulation of macrosegrega…
The reliability of the power system mainly depends on the environmental and weather conditions which cause flashover on polluted insulators leading to system outages. It is generally recognized that the main causes leading to the contamination of insulators are marine pollution found in the immediate neighborhood of t…
Abstract Zur Eigenschaftsoptimierung thermisch gespritzter Schichten stehen verschiedene Nachbehandlungsverfahren zur Verfügung. In dieser Arbeit wird die plasmaelektrolytische Oxidation lichtbogengespritzter Aluminiumschichten auf Aluminiumsubstraten vorgestellt. Der Verschleißwiderstand der oxidierten Schichten wird…
The issue of nanodielectrics has recently become an important field of interest. The term describes nanometric dielectrics, i. e. dielectric materials with structural dimensions typically smaller than 100 run. In contrast to the behaviour of a bulk material the nanodielectrics can behave completely different. With shr…
About 150 accessory minerals have been identified in the rare-metal-rare earth pegmatites, including 36 OH-, F- and H 2 O-bearing silicates, 27 volatile-free silicates, 31 complex oxides, and 17 carbonates. Most accessories contain Y and Ce, and a few, certain other REEs. This diversity is a result of multistage postm…
We have studied the glass-forming regions in the lead-fluoride-containing quaternary fluorozirconate systems ZrF 4 -PbF 2 -LaF 3 -NaF (ZPLN), ZrF 4 -PbF 2 -BaF 2 -LaF 3 (ZPBL), and ZrF 4 -PbF 2 -BaF 2 -NaF (ZPBN). Their temperature characteristics have been determined by differential thermal analysis, and the most sta…
An ordered CuAu alloy, which had relatively coarse grains (5 to 10 μm), without the lamellar structure, is mechanically tested at temperatures from 77 to 658 K. The temperature dependence of the yield stress is shown to be anomalous with a maximum nearT p≈573 K. The TEM analysis reveals the presence of single dislocat…
Magnetic and neutron-diffraction methods have been used to study the magnetic state of polycrystalline and amorphous samples of the intermetallic compound Ce 2 Fe 17 . The amorphous state was obtained by irradiating the intermetallic compound by fast neutrons. It has been shown that the competition of ferromagnetic an…
A PVC nanocomposite has been obtained by exploiting the exfoliation of Na–bentonite in water and the fact that vinyl chloride is usually polymerised as a water suspension or emulsion. An exfoliated clay aqueous dispersion is prepared and blended with PVC latex before the latter is dried, leading to intimate mixing and…
A novel method using the layer by layer (LBL) technique was investigated to deposit polyelectrolytes with antibacterial properties. A glass substrate was coated by a cationic biguanide followed by the anionic polystyrene sulfonate until a total of twenty layers were deposited. The layers thickness was measured by elli…
Abstract In the textile industry a tool is needed that can predict fibre and yarn movement in turbulent air streams. The Institut für Textiltechnik of RWTH Aachen University (ITA) has developed a yarn model that can be used to study the movement of single fibres and yarns in turbulent air flows. The kinematic model is…
Surface modification treatments have been utilized in the physical and chemical modifications of the fiber surfaces since long time. Fiber properties have been improved thanks to different modification techniques, and their utilizables have been increased in a lot of areas. In this paper, the surface modification trea…
The system Li2O-WO3-B2O3 were prepared with equal molar ratios of both Li2O and WO3 by the usual rapid quenching technique. From the analysis of X-ray diffraction data (using a Mo-source of wavelength λ = 0.709 Å), it was found that for 0.0 ≤ x ≤ 0.25 the systems formed are crystalline, while for x ≥ 0.30, glassy form…
The manganese oxide material K-OMS-2 was synthesized both via a redox reaction between potassium permanganate and manganese nitrate in an acidic medium (nitric acid) under reflux conditions and by the sol–gel reaction between KMnO 4 and maleic acid employed in a 3:1 molar ratio. Cerium(IV) was then added by an ion-exc…
Abstract The effect of processing variables (filler loadings) and operating variables (frequency) on the impedance and electromagnetic interference shielding effectiveness of vapor grown carbon nanofiber (VGCNF) reinforced chlorobutyl vulcanizates has been investigated. The dispersion and morphology of the VGCNF in th…
Abstract The Co—Ni distribution in d -Al 69.7(4) Co 10.0(4) Ni 20.3(4) was investigated based on X-ray and neutron diffraction data. The structure was modelled in higher dimensional space using the ‘charge-flipping’ and ‘low-density elimination’ methods and it was quantitatively refined in three-dimensional space empl…
It is essential to determine the relationship between soil chemical and mineralogical properties and soil response to acid load to understand the acid-neutralizing capacity and cation behavior of different ecosystems. For 46 soil samples from a subsurface horizon in humid Asia, that is, Japan, Thailand and Indonesia,…
The distribution of alloying atoms over the sites of the ordered crystal lattices of the γ′ phase and the Ni 2 Cr superstructure that form during aging of the EK78 superalloy is determined by neutron diffraction, and their long-range order parameters are measured. The size, shape, and orientation of the forming γ′-pha…
Aluminum Nitride (AlN) ceramics are used as wafer heating plates and wafer holding electrostatic chucks in semiconductor fabrication equipments. For tailoring the electrical resistivity to satisfy the requirements of each component, several kinds of approaches were investigated for hot-pressed AlN ceramics. Three tech…
The distribution of sulfur atoms embedded in single crystals of zeolite Na X is investigated using the single-crystal X-ray diffraction analysis. It is shown that, in the unit cell of the Na X (S) zeolite, 67 sulfur atoms are located in the form of S 8 or S 6 rings and S 2 molecules in large cavities and in the form o…