Browsing Institutt for materialteknologi by Title
Now showing items 2362-2381 of 2563
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The leachability of a ternary CaO-Al2O3-SiO2 slag produced from smelting-reduction of low-grade bauxite for alumina recovery
(Journal article; Peer reviewed, 2019)A combination of smelting-reduction of bauxite and leaching treatment of the produced slag for alumina recovery is known as the Pedersen process. The process is considered to be more sustainable for producing metallurgical-grade ... -
The Leachability of Calcium Aluminate Phases in Slags for the Extraction of Alumina
(Journal article, 2017)Alumina is used primarily as feedstock for aluminum production. It occurs naturally in bauxite and clay and other minerals, and can be concentrated in industrial by-products such as coal gangue, fly ash, blast furnace slag, ... -
The Mechanism Behind the Oxidation Protection of High Mg Al Alloys with Beryllium
(Journal article; Peer reviewed, 2018)The addition of beryllium to Al-Mg alloys is known to cause a dramatic decrease in oxidation; however, the mechanism behind this protective effect is not yet fully understood. To aid in finding an alternative to the toxic ... -
The Metallurgical Foundation for Manufacturing of CeS-Based Grain Refiners for Steels
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:227, Doctoral thesis, 2009)This doctoral thesis is concerned with experimental studies of the conditions for CeS formations during manufacturing of Ce-S/Ce-S-Al/Ce-S-Al-Fe based grain refiners for steels. The thesis is divided into five parts. Part ... -
The micro- and macrostructure of alumina rafts
(Journal article; Peer reviewed, 2019)As alumina particles are fed to aluminium reduction cells, a frozen layer of bath is typically formed on the particle surface, due to the relatively low bath superheat. For particles in close proximity, platelets with ... -
The multiple roles of an organic corrosion inhibitor on copper investigated by a combination of electrochemistry-coupled optical in situ spectroscopies
(Journal article; Peer reviewed, 2018)The interaction of the organic corrosion inhibitor 2-mercaptobenzothiazole (MBT) with copper in alkaline solution was investigated by in situ infrared (IR) and Raman spectroscopy, and in situ spectroscopic ellipsometry, ... -
The Optimization of Salt Additions during Processing of Aluminium-Magnesium Alloys
(Master thesis, 2013)Sodium is well known to be a cause for edge cracking during rolling of aluminium-magnesium alloys (AA5xxx). Due to this, requirements for the sodium contents in Al-Mg alloys are often less than 1,0 ppm. The electrolytic ... -
The oxidation of boron carbide (B4C) during storage at ambient conditions
(Master thesis, 2024)Borkarbid, med sine utmerkede mekaniske egenskaper, har flere bruksområder i dag. De viktigste av disse er som energiabsorbent i skuddsikre vester og i forskjellige slipemaskiner. Borkarbid brukes som material til ... -
The Oxygen Evolution Reaction at Iridium-Ruthenium Oxide Catalysts for PEM Water Electrolysis
(Master thesis, 2015)A sustainable method for hydrogen production can be achieved with PEM water electrolysers. These are considered important for the transition to a society based on renewable energy production as they can be coupled with ... -
The oxygen evolution reaction mechanism at IrxRu1−xO2 powders produced by hydrolysis synthesis
(Journal article; Peer reviewed, 2018)A mechanistic study of the oxygen evolution reaction (OER) has been performed for IrxRu1−xO2, x = 1, 0.6, 0.3 and 0, prepared by the hydrolysis synthesis. The oxides were characterized by X-ray diffraction, cyclic voltammetry ... -
The performance of aluminium electrolysis in cryolite based electrolytes containing LiF, KF and MgF2 in a laboratory-scale cell
(Doctoral thesis at NTNU;2015:254, Doctoral thesis, 2015)The electrolyte composition plays a very important role in aluminium electrolysis. Higher current efficiency and lower energy consumption can be obtained through modifying the composition of the electrolyte. The important ... -
The Potential of Functionalized Ceramic Particles in Coatings for Improved Scratch Resistance
(Journal article; Peer reviewed, 2018)The top layer of a typical high pressure floor laminate (HPL) consists of a melamine formaldehyde (MF) impregnated special wear layer (overlay) with alumina particles. This top layer plays a crucial role in determining the ... -
The potential of zero total charge and electrocatalytic properties of Ru@Pt core-shell nanoparticles
(Journal article; Peer reviewed, 2019)Electrocatalysis of the oxygen reduction reaction (ORR), oxidation of carbon monoxide, and the methanol oxidation reaction (MOR) are all critical to the performance of direct-methanol fuel cells (DMFC). In this work we ... -
The Properties of Calcined Anthracite
(Master thesis, 2017)The aim of this thesis has been to look at the thermal behaviour of anthracite, coke and charcoal regarding their expansion during heating and their release of off-gases. Furthermore, to look at how the porosity and expansion ... -
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 ... -
The real area of nanoporous catalytic surfaces of gold and palladium in aqueous solutions
(Journal article; Peer reviewed, 2018)The determination of the real, or active, area of a catalytic surface is a key requirement to understand or quantify parameters related to its electrochemical behavior. There are several experimental methods available, but ... -
The Reassigned Pseudo Wigner-Ville Transform in Electrochemical Noise Analysis
(Journal article; Peer reviewed, 2019)Several different time–frequency transforms from signal processing were used to analyze electrochemical noise data to determine frequency components contained within the noise record and their time evolution. Bilinear ... -
The relation between microstructure and thermoelectric properties in Ta-substituted A-site deficient CaMnO3
(Master thesis, 2017)Calcium manganite, CaMnO3, is an n-type semiconductor with promising thermoelectric (TE) properties. However, for commercial applications the performance of the material, described by the thermoelectric figure of merit ... -
The Relationship between Hydroxyl Content and Viscosity of Fused Silica for the Czochralski Process
(Master thesis, 2019)Kvartsglass av høy kvalitet brukes i digler til produksjon av monokrystallinske silisium "ingots" i solcellein- dustrien. Monokrystallinske wafere blir laget i slike digler ved Czochralski(CZ)-prosessen. Digelen kan ikke ... -
The Role and Persepective of Electrodialysis in Electrowinning of Silver from Secondary Materials
(Master thesis, 2023)Effektiv resirkulering av sølv er essensielt dersom man skal klare å dekke den stadig økende etterspørselen av sølv i alt fra medisinsk utstyr, til elektriske biler og solceller. Denne masteroppgaven fokuserer derfor på ...