Browsing Institutt for materialteknologi by Issue Date
Now showing items 401-420 of 2540
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Wet Chemical Synthesis of Graphene for Battery Applications
(Master thesis, 2014)In this thesis, an improved Hummers method is used to produce graphene oxide, while thermal treatment has been used as the reduction process to form reduced graphene oxide. This modified version of Hummers method differs ... -
Thermal Stability and Electrochemical Performance of Graphite Anodes in Li-ion Batteries
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:101, Doctoral thesis, 2014) -
Life Cycle Assessment of Body-in-White Produced from Recycled Aluminum
(Master thesis, 2014)The secondary production of aluminum has a large potential in terms of energy savings compared to primary production. Due to the increasing use of aluminum in products, there is a larger demand for aluminum than can be ... -
Thermoelectric Properties of A-site Deficient Lanthanum Substituted Strontium Titanate
(Master thesis, 2014)The n-type thermoelectric material (La0.12Sr0.88)0.95TiO3-delta was sintered with the spark plasma sintering method at different temperatures and pressures. This was done to reduce the thermal conductivity of the material ... -
Silicon for silicon nitride based products
(Master thesis, 2014)Previous studies have investigated the effect of the oxide layer (Ovregård 2013) and iron content (Hem 2013) on the nitridation of silicon powders. This report will take a closer look into the growth mechanisms of different ... -
Synthesis and characterization of hybrid aminopropyl silane-based coatings on stainless steel substrates
(Journal article; Peer reviewed, 2014)Transparent and homogeneous hybrid aminopropyl silane-based coatings on steel were prepared by the sol–gel method using hydrolyzed γ-APS as a precursor. The coatings were fabricated by dip coating, and the effect of pH, ... -
A concept for electrowinning of aluminium using depolarized gas anodes
(Journal article; Peer reviewed, 2014)Aluminium is today commercially produced by the Hall-Héroult process using consumable carbon anodes. Consumable anodes have some concerns such as CO2 emission, continuous anodecathode distance adjustments and replacements ... -
Thermal and mechanical properties of crack-designed thick lanthanum zirconate coatings
(Journal article; Peer reviewed, 2014)Vertical cracks are beneficial in thermal barrier coatings due to enhanced thermo-mechanical compliance. Accordingly, an aqueous nitrate based precursor solution was atomized on stainless steel substrates by spray pyrolysis ... -
Development of a new class of oxygen ion mixed conductors.
(Master thesis, 2014)Dense ceramic membranes with mixed ionic and electronic conductivity can separate 100 % pure oxygen from air at elevated temperature. They constitute a much cheaper and more environmentally friendly alternative to cryogenic ... -
Direct electrochemical reduction of hematite pellets in alkaline solutions
(Journal article, 2014)Our previous studies on the electrowinning of iron from hematite particles suspended in sodium hydroxide solutions demonstrated that iron was produced through a direct solid phase electrochemical reduction of the oxide ... -
Wear of carbon cathode lining in aluminium electrolysis cell: The effect of rotation speed in laboratory test cell
(Master thesis, 2014)The aluminium smelters are continually trying to increase their production either by designing high amperage cells or increasing the amperage on available cell designs. The service life for aluminium reduction cells is ... -
Slag Refining of Iron with Respect to Phosphorus
(Master thesis, 2014)TiZir Titanium and Iron produces high purity pig iron and titania slag from ilmenite. However, new ilmenite ores from Grande Côte Mineral Sands Project mine contain high level of phosphorus, which will contaminate the ... -
Reduction of SiO2 to SiC using natural gas
(Journal article; Peer reviewed, 2014)This paper presents a preliminary study of SiC production by use of natural gas for reduction of silica. Direct reduction of SiO2 by gas mixtures containing CH4, H2, and Ar was studied at temperatures between 1273 K and ... -
Thermal Conductivity, Heat Sources and Temperature Profiles of Li-ion Batteries
(Journal article; Peer reviewed, 2014)In this paper we report the thermal conductivity of several commercial and non-commercial Li-ion secondary battery electrode materials with and without electrolytesolvents. We also measure the Tafel potential, the ohmic ... -
Isothermal annealing of cold-rolled Al−Mn−Fe−Si alloy with different microchemistry states
(Journal article, 2014)Microstructural evolution of a cold-rolled Al–Mn–Fe–Si alloy during annealing was studied. Except the as-cast variant, two other different homogenizations were considered, one gave a high density of fine dispersiods providing ... -
Synthesis of ilmenite
(Master thesis, 2014)Ilmenite ores are currently processed at TiZir Titanium & Iron AS in Tyssedal. To be prepared for a change in the raw material composition, the effect of the impurities in the ilmenite ores has to be investigated. It is ... -
Effect of Solution Annealing on Plasma Weld Deposited Ti-6Al-4V Characterized by In-Situ Tensile Testing Combined With EBSD
(Master thesis, 2014)This work is based on the work done by Mathisen et al. [1], which considers the mechanical properties of the components produced by Norsk Titanium (NTi). NTi produces Ti-6Al-4V (grade 5 titanium) components by additive ... -
Protective Spinel Coatings for Metallic Interconnects in Solid Oxide Fuel Cells
(Master thesis, 2014)Solid oxide fuel cells (SOFC) are one of the most effective ways to produce electrical energy and are seen as the most promising energy producer from a variety of fuels. To produce a sufficient amount of energy, several ... -
A first-principles Study of epitaxial Interfaces between Graphene and GaAs
(Master thesis, 2014)Epitaxial interfaces between graphene and GaAs(111) have been investigated through a first-principles study using density functional theory (DFT). The GaAs(111) surface at the interface is assumed to be 2x2 reconstructed ... -
On the Effect of Atoms in Solid Solution on Grain Growth Kinetics
(Journal article; Peer reviewed, 2014)The discrepancy between the classical grain growth law in high purity metals (grain size D∝t1/2D∝t1/2) and experimental measurements has long been a subject of debate. It is generally believed that a time growth exponent ...