Browsing Institutt for materialteknologi by Issue Date
Now showing items 501-520 of 2540
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Connection Between Critical Stress and Hydrogen Content for SDSS under Cathodic Protection
(Master thesis, 2014)In recent years Super Duplex Stainless Steel (SDSS) installed subsea with cathodic protection has failed during service. The failures have been due to Hydrogen Induced Stress Cracking (HISC). The effect from different ... -
1D oxide nanostructures from chemical solutions
(Journal article; Peer reviewed, 2014)Nanotechnology has motivated a tremendous effort to grow free standing or hierarchical nanomaterials such as nanowires and nanorods. Bottom-up approaches based on chemistry are an important approach to nanomaterials, and ... -
Solidification of Silicon: Macro- and Microstructure as Functions of Thermal History and Composition
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:21, Doctoral thesis, 2014) -
Fabrication of a Silicon Photonic Crystal Biosensor
(Master thesis, 2014)The research performed in the scope of the master project and described in this thesis is devoted to the study of a two dimensional photonic crystal biosensor in silicon. The band gap of hexagonal photonic crystal slab ... -
Removal of Phosphorus in Metallurgical Silicon by Rare Earth Elements
(Journal article; Peer reviewed, 2014)Removal of phosphorus in metallurgical silicon is one of the crucial steps for the production of solar grade Si feedstock. The possibility of doping rare earth elements for phosphorus removal has in this work been studied ... -
Stability of carbon nanofibre-supported platinum catalysts in the presence of chloride under controlled mass-transfer conditions
(Journal article, 2014)The effect of chloride on the stability of platinum electrocatalysts was studied by rotating disk measurements in sulfuric acid electrolyte with a continuously increasing concentration of chloride anions. The activity ... -
Mechanical Properties and Corrosion Behaviour of Extruded and Welded AA6082
(Master thesis, 2014)Welding and corrosion will play a key role in the further increased use of aluminium alloys in industrial applications. This is especially true as the oil and gas industry is moving into the arctic region in search for new ... -
Varmtorsjonstesting av 3xxx-legeringer
(Master thesis, 2014)Styrkeeffekten av dispergerte partikler har blitt utforsket for en 3xxx-legering ved varmtorsjons-testing. Legeringens komposisjon var: 0,97wt.% Mn, 0,5wt.% Fe, 0,15wt.% Si og 0,05wt.% annet. Det er gjort fire forskjellige ... -
Van der Waals density functional study of the energetics of alkali metal intercalation in graphite
(Journal article; Peer reviewed, 2014)We report on the energetics of intercalation of lithium, sodium and potassium in graphite by density functional theory using recently developed van der Waals (vdW) density functionals. First stage intercalation compounds ... -
Electrochemical behaviour of dissolved iron chloride in KCl+LiCl+NaCl melt at 550 ºC
(Journal article, 2014)An electrochemical study of iron was carried out in KCl+LiCl+NaCl melt at 550ºC using a glassy carbon working electrode. Cyclic voltammetry showed that the Fe(II)/Fe(0) electron exchange is a soluble/insoluble reversible ... -
Hydrogen induced stress cracking of alloy 718: Effects of chemical composition and microstructure
(Master thesis, 2014)This master thesis have examined the effect of variations in composition and microstructure on the HISC susceptibility of Inconel-718. 6 different Inconel-718 variants with different compositions and heat treatments were ... -
Cold Pressure Welding of Dissimilar Aluminum Alloys under Conditions Applicable to Hybrid Metal Extrusion & Bonding (HYB)
(Master thesis, 2014)Traditional solid-state welding methods mainly focuses on joining of similar materials.But with the increased interest in multi-material constructions more research is neededon joining of dissimilar materials. In the present ... -
Revisiting the Crystal Structure of Rhombohedral Lead Metaniobate
(Journal article; Peer reviewed, 2014)Lead metaniobate (PbNb2O6) can exist both as a stable rhombohedral and a metastable orthorhombic tungsten-bronze-type polymorph. While the orthorhombic is a well-known ferroelectric material, the rhombohedral polymorph ... -
Avaliação experimental e simulação computacional da dissolução de partículas de cloreto de sódio em salmoura em escoamento
(Journal article; Peer reviewed, 2014)A mathematical model to predict the dissolution of salt particles suspended in a brine flow is provided. The model consists of a system of three partial differential equations (PDE) based on mass conservation of salt ... -
Dispersion, Performance and Durability of Pt Nanoparticles on Carbon for PEM Fuel Cell Catalysis
(Doctoral theses at NTNU;2014:298, Doctoral thesis, 2014)The main objective of this work has been to develop the understanding of the effect of Pt particle dispersion on activity and durability of the Pt/C electrocatalysts. In order to have such understanding, extensive testing ... -
Potassium Sodium Niobate Thin Films by Chemical Solution Deposition
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:300, Doctoral thesis, 2014)Stable aqueous KNN-based precursor solutions were developed by using simple and cheap starting materials and good wetting of the precursor solution was secured by the addition of small amounts of polyvinylalcohol. The ... -
Growth Instabilities and Thermo-elastic Stresses in Czochralski Process for Silicon Single Crystal
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:150, Doctoral thesis, 2014)Silicon single crystal pulling process by Czochralski method is a multi-scale problem from atomistic scale defects up to several meters. This process involves several sources of instabilities e.g. crystal diameter perturbation, ... -
Structure, Selectivity and Electrocatalytic Activity of Iridium-Based Oxides for Oxygen Evolution
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:124, Doctoral thesis, 2014)Iridium dioxide-based electrocatalysts were chosen as main object of the study because these materials are well-known in electrochemical technology as active and durable in a number of anodic reactions. However, some ... -
High Pressure Die Casting of Light Metals: Heat Transfer in the HPDC process
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:197, Doctoral thesis, 2014)Heat transfer during cold chamber High Pressure Die Casting High Pressure Die Casting (HPDC) is achieved by pouring liquid metal into a steel cylinder and forcing this metal into a die cavity using high pressure. The ... -
Solid solubility of rare earth elements (Nd, Eu, Tb) in In2−xSnxO3 – effect on electrical conductivity and optical properties
(Journal article; Peer reviewed, 2014-05-07)Wide band-gap semiconductors doped with luminescent rare earth elements (REEs) have attracted recent interest due to their unique optical properties. Here we report on the synthesis of the transparent conducting oxides ...