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Showing 1 to 20 of 81 for “"interdiffusion"”.
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Interdiffusion Analysis For Nicocraly And Nial Vs. Various Superalloys
… to oxidation/hot-corrosion, and multicomponent interdiffusion from and into the superalloy substrate. In this study, the rate of Al interdiffusion into selected Ni-base superalloys using various diffusion couples of two-phase NiCoCrAlY (beta + gamma) and single beta-phase NiAl with the selected …
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Phenomenology And Experimental Observations In High Temperature Ternary Interdiffusion
… method to extract composition dependent ternary interdiffusion coefficients from a single diffusion couple experiment is presented. The calculations involve direct determination of interdiffusion fluxes from experimental concentration profiles and local integration and differentiation of …
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Silicon-Germanium interdiffusion and its impacts on enhanced mobility MOSFETs
… for strained Si and SiGe technology is Si-Ge interdiffusion during thermal processing. Two different aspects of Si-Ge interdiffusion are explored in this work. The first part of this work demonstrates that Si-Ge interdiffusion and ion implantation damage during the fabrication of strained Si …
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Short-time interdiffusion at polymer interfaces: A probe to study polymer motion
… thereby suggest the mechanism of polymer-polymer interdiffusion. In the first experiment, a thin layer ($\sim$400-1500 A) of triblock polystyrene (HDH), wherein the central half of the chain was deuterated, was interdiffused into a thin layer of similar polymer (DHD), wherein the labeling was …
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Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies.
… stable than Zr silicate films, from the metal interdiffusion point of view. On the other hand, dopant (B, As, and P) penetration is observed for HfSixOy films. However, the addition of nitrogen to the Hf - Si - O systems improves the dopant penetration properties of the resulting HfSixOyNz …
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An in-situ interdiffusion method for harvesting energy from an aluminum-water reaction
… than current lithium-ion batteries. An in-situ interdiffusion method for reacting aluminum in water was conceived in which elemental aluminum is able to overcome the passivating aluminum oxide layer by diffusing into liquid gallium. The aluminum atoms in solution with the gallium react to …
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Polymer/Fullerene Photovoltaic Devices - Nanoscale Control of the Interface by Thermally-controlled Interdiffusion
… bulk of the devices is improved by inducing an interdiffusion of the two materials by heating the devices in the vicinity of the glass transition temperature of the polymer. In this manner, a concentration gradient of polymer and fullerene throughout the bulk is created. The proximity of a …
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Spectroscopic Characterization of Molecular Interdiffusion at a Poly(Vinyl Pyrrolidone) / Vinyl Ester Interface
… the composite. In this research, the molecular interdiffusion across a poly(vinyl pyrrolidone))/vinyl ester monomer (PVP/VE) interface is being investigated by Fourier Transform Infrared Attenuated Total Reflectance (FTIR-ATR) spectroscopy. The ATR method which can be used to characterize the …
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Vibrational spectroscopy studies of interdiffusion in polymer laminates and diffusion of water into polymer membranes.
… microspectroscopy has been used to study the interdiffusion in polymer laminates at the interfacial region between the constituent polymer layers. The effects of the polymer molecular weight, annealing temperature, and annealing time have been studied. Three different laminates with various …
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Nickel-based superalloy operating temperature determination via analysis of gamma/gamma' microstructure and coating/base material interdiffusion
… microstructure and coating/base metal interdiffusion methods. The [gamma]' volume fraction was measured by point counting and direct area measurement. The data, however, were found inadequate to accurately determine the operating temperature. The interdiffusion between the platinum …
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Control of interface reactions in SiC/Ti composites and an X-ray diffraction study of interdiffusion between Al thin films and Ti substrates
In SiC/Ti composites, the physical-chemical behaviour at the interface at fabrication temperatures, is important. Ideally, only a thin bonding film is desired after fabrication with zero growth during the actual service conditions. In this study, two mechanisms which lower the growth rate of …
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Optimization of the automated spray layer-by-layer technique for thin film deposition
… the parameter effects, polyelectrolyte interdiffusion in the films was observed. This interdiffusion is investigated using both the conventional dipped LbL and Spray-LbL deposition techniques. Interdiffusion is shown to be dependent on 3 factors, the charge density of the …
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Dual Spin-Cast Thermally Interdiffused Polymeric Photovoltaic Devices
… various heat treatments in order to induce the interdiffusion. The depth profiles show concentration gradients in the donor and acceptor as a result of interdiffusion and these devices show an order of magnitude increase in the device performance compared to the bilayer devices. Dual spin-cast …
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Effects of Thickness, Morphology and Molecular Structure of Donor and Acceptor Layers in Thermally Interdiffused Polymer Photovoltaics
… processes. This is achieved through heat-induced interdiffusion of the two materials at temperatures above the glass transition temperature of the polymer. Investigation of the poly(3-octylthiophene) (P3OT) – C₆₀ system show a three-fold improvement in the external quantum efficiencies (EQE) as …
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Study of polymeric film bonding for pharmaceutical applications
… based thin-films into tablets. By utilizing the interdiffusion model of polymer adhesion from past studies, we combine the base polymer HPMC (hydropropyl methyl cellulose) with varying amounts of a popularly used plasticizer PEG (polyethylene glycol) in order to achieve adequate bonding for …
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The Influence of Alloying Additions on Diffusion and Strengthening of Magnesium
… and analytical Transmission Electron Microscopy. Interdiffusion in binary Mg systems is determined by Sauer-Freise and Boltzmann-Matano methods. Kirkaldy*s extension of the Boltzmann-Matano method, on the basis of Onsager*s formalism, is employed to quantify the main- and cross-interdiffusion …
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Defect engineering of InP and InGaAs for optoelectronic applications
… layer techniques, was also used to promote interdiffusion of InP /InGaAs and InGaAs/ AlGainAs quantum well structures, thereby tuning the emission/ detection -wavelengths. The damage accumulation processes resulting from implantation in InP and InGaAs at different temperatures was found to …
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Defect engineering of InP and InGaAs for optoelectronic applications
… layer techniques, was also used to promote interdiffusion of InP /InGaAs and InGaAs/ AlGainAs quantum well structures, thereby tuning the emission/ detection -wavelengths. The damage accumulation processes resulting from implantation in InP and InGaAs at different temperatures was found to …
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