Browsing Institutt for materialteknologi by Issue Date
Now showing items 241-260 of 2534
-
ARB-valsede laminatkompositter av AA3103 og Cu
(Master thesis, 2012)Laminatkompositter av plater av AA3103 aluminium + copper, samt AA3103 + C24000 messing, har blitt laget ved å anvende en prosess for akkumulert valsesveising (ARB). To forskjellige kobber/aluminium-stabler ble utsatt for ... -
Electrochemical impedance spectroscopy of a porous graphite electrode used for Li-ion batteries with EC/PC based electrolytes
(Journal article; Peer reviewed, 2012)Electrochemical impedance spectroscopy has been employed to investigate different electrolyte compositions used for lithium-ion batteries. Diffusion coefficients in ethylene carbonate (EC) was estimated to be in order of ... -
Utvikling av metode for bråkjøling i SEM og in situ EBSD-karakterisering av fasetransformasjoner i F 70 stål.
(Master thesis, 2012)Fasetransformasjoner som skjer ved sveising av F 70 arktisk stål fører til at ugunstige mikrostrukturer oppstår i den varmepåvirkede sonen av grunnmaterialet (HAZ). Ved gjentatt oppvarming av HAZ vil det kunne dannes områder ... -
The Effect of HAZ Microstructure on the Utilisation Potential of 13%Cr Flowlines
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:7, Doctoral thesis, 2012)Supermartensitic stainless steel pipelines are used in the oil and gas industry mainly to transport oil and gas products from wells to offshore installations or even to shore. Most of these pipes are installed by the reeling ... -
Photoelectrochemical Hydrogen Production
(Master thesis, 2012)The possibilities for using CaNb2O6 as a photocatalyst in direct water splitting have been evaluated by investigating the electronic structure of the material. In addition the oxide was doped with nitrogen in order to ... -
Characterization and recovery of rare earth elements from electronic scrap
(Master thesis, 2012)The rare earth elements are a group of 17 elements consisting of the lantahnide series, scandium and yttrium. The application with the largest rare earth consumption is the permanent rare earth magnets. The neodymium-iron-boron ... -
Synthesis and Properties of Electrolyte and Cathode Materials for Proton Conducting Fuel Cells
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:165, Doctoral thesis, 2012)Solid oxide fuel cells using proton conducting electrolytes are potentially efficient devices for energy conversion, but there is a need for improving the performance of the materials to make them economically feasible. ... -
Aluminizing of plain carbon steel: Effect of temperature on coating and alloy phase morphology at constant holding time
(Master thesis, 2012)Aluminized steel possesses excellent physical, chemical and mechanical properties as compared to plain carbon steel. This type of steel has found application in high temperature, oxidizing and corrosive environments. In ... -
Alloys as Anode Materials in Magnesium Ion Batteries
(Master thesis, 2012)This thesis is a feasibility study of the possible application of magnesium alloys forfuture magnesium-ion batteries. It investigates dierent alloys and characterizesthem with respect to internal resistance, overpotentials ... -
La0.2Sr0.8Fe0.8Ta0.2O3 (-) (delta) based thin film membranes with surface modification for oxygen production
(Journal article; Peer reviewed, 2012)High temperature dense ceramic membranes made from mixed ionic/electronic conducting perovskite ceramics represent a high potential as a reliable source for oxygen and syngas production. In this work, La0.2Sr0.8Fe0.8Ta0.2O3 ... -
Processing of thin film ceramic membranes for oxygen separation
(Journal article; Peer reviewed, 2012)Processing of dense and thin ceramic membrane layers for high temperature selective oxygen separation is addressed in this study. Mixed oxygen-ionic and electronic conducting perovskite oxide system based on La0.2Sr0.8Fe ... -
The Rate of HF Formation During Addition of Aluminas to Cryolite Melts
(Master thesis, 2012)One of the biggest contributors of the gas emission in smelting process of aluminium is fluoride. Major contributor to the fluoride emissions is the hydrogen fluoride (HF) gas. HF gas is formed when fluoro compounds from ... -
Oxygen evolution on La1-xSrxCoO3 Pellet-Electrodes in alkaline Solution: Charge Carrier density dependence of electrocatalytic activity
(Master thesis, 2012)Alkaline water electrolysis need a catalyst with low overpotential and high current densitiy for oxygen evolution in order to be a commercial viable hydrogen source in the future. Finding and establishing a correlation ... -
Deposition of Thin Film Electrolyte by Pulsed Laser Deposition (PLD) for micro-SOFC Development
(Master thesis, 2012)Optimalization of PLD deposition of YSZ for micr-SOFC electrolyte applications by varying deposition pressure and target-substrate distance.Substrate used was Si-based chips and wafers (large area PLD), and the substrate ... -
Characterization of Defects in N-type Cz Silicon for Solar Cells
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:269, Doctoral thesis, 2012)With increasing attention to high efficiency solar cells in the photovoltaic industry, ntype Cz silicon has become increasingly popular due to its potential for high-end devices. As the metal content in Cz silicon is reduced ... -
Controlled Laser Damage of Single-Photon Avalanche Photodiodes
(Master thesis, 2012)Quantum cryptography has been developed from being a theoretical proposal to having real world applications, with companies developing and selling quantum key distribution (QKD) instruments commercially. Although laws of ... -
Refining of Silicon by Solidification of Al-Si Melt
(Master thesis, 2012)Primary silicon crystals grown from an Al-Si melt has been investigated by solidifying directionally and under electromagnetic field. The goal of this thesis was to increase the size of the primary Si crystals and to ... -
Effect of marine environment on the tribology performance of materials used in lubricated rotating parts of offshore wind turbines
(Master thesis, 2012)The use of offshore wind turbines as a source of renewable energy is promising. However, many challenges have to be solved before they will be cost effective. The operation time, without any maintenance required, is desired ... -
Formation of Silicon Carbide and Graphite in the Silicomanganese Process
(Master thesis, 2012)When a liquid SiMn alloy is cooled, carbon is dissolved from the melt. The dissolved carbon either forms graphite or reacts with silicon from the melt to form SiC. The goal of this thesis has been to determine how temperature ... -
An experimental investigation of co-sintering of oxygen permeable asymmetric membranes with composition La0.2Sr0.8Fe0.8Ta0.2O3-*.
(Master thesis, 2012)Asymmetric membranes of composition La0.2Sr0.8Fe0.8Ta0.2O3 were co-sintered from tape casted membranes and porous supports. The ceramic powders for dense and porous supports were obrained through coarsening and solid state ...