Browsing Institutt for materialteknologi by Title
Now showing items 2484-2503 of 2563
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Understanding reaction mechanisms using dynamic electrochemical impedance spectroscopy: Methanol oxidation on Pt
(Journal article; Peer reviewed, 2019)Data from a combined cyclic voltammetry and dynamic electrochemical impedance spectroscopy (dEIS) study of the methanol oxidation reaction (MOR) at high temperatures was revisited using a new method for mechanistic modeling. ... -
Understanding the Hydrothermal Formation of NaNbO3: Its Full Reaction Scheme and Kinetics
(Peer reviewed; Journal article, 2021)Sodium niobate (NaNbO3) attracts attention for its great potential in a variety of applications, for instance, due to its unique optical properties. Still, optimization of its synthetic procedures is hard due to the lack ... -
Understanding the inoculation of aluminium grains during welding under the influences of high cooling rate and high temperature gradient
(Peer reviewed; Journal article, 2023)Inoculation is an important method to generate fine equiaxed grain structures in alloys during solidification, which is widely used in shape casting and direct chill casting processes of aluminium alloys. Different from ... -
Undersøkelse av metoder for elektrodemontering og -materialer i Hoopes-prosessen
(Bachelor thesis, 2021)Aluminium fra Hall-Héroult-prosessen kan raffineres videre til superrent aluminium i en trelags elektrolyseprosess kalt Hoopes-prosessen. Elektrodene i prosessen består av grafitt, en beskyttende keramklokke, og de er ... -
Undersøkelse av urenheter i elektrolytt for produksjon av kobber
(Master thesis, 2023)Tellur-ioner (Te4+ og Te6+), vismut-ioner (Bi3+), antimon-ioner (Sb3+) og klor-ioner (Cl– ) er typiske urenheter i en kobberelektrolytt. Det var ønskelig˚a undersøke disse urenhetene da det er relativt ukjent hva slags ... -
Uniaxial Néel vector control in perovskite oxide thin films by anisotropic strain engineering
(Peer reviewed; Journal article, 2021)Antiferromagnetic (AF) thin films typically exhibit a multidomain state, and control of the AF Néel vector is challenging, as AF materials are robust to magnetic perturbations. In this paper, uniaxial Néel vector control ... -
A unified approach for the calculation of in-plane dielectric constant of films with interdigitated electrodes
(Peer reviewed; Journal article, 2020)Interdigitated electrodes (IDEs) on dielectric films is an important electrode design in electrical components such as transducers and sensors. Further development and use of IDEs for characterization of the in-plane ... -
Unraveling the enhanced stability and strength of Al Σ9 (221)[ 1 1 ¯ 0 ] symmetric tilt grain boundary with Mg segregation
(Journal article; Peer reviewed, 2022) -
Unveiling AC electronic properties at ferroelectric domain walls
(Journal article; Peer reviewed, 2021) -
Use of a Distributed Micro-sensor System for Monitoring the Indoor Particulate Matter Concentration in the Atmosphere of Ferroalloy Production Plants
(Peer reviewed; Journal article, 2022)Airborne particulate matter (PM) is a concern for both occupational health and the environment, and, in the ferroalloy industry, the level of such particles in the air can be considerable. Small, low-cost sensors for ... -
The Use of Fe-26Si-9B Alloy as Phase Change Material in Si<inf>3</inf>N<inf>4</inf> Container
(Peer reviewed; Journal article, 2022)Fe-26Si-9B alloy was selected as a potential phase change material (PCM) to store energy at temperatures up to 1300 °C. A suitable refractory material is crucial to building a PCM container for Fe-26Si-9B alloy in thermal ... -
Use of H2 in Mn-Ferroalloy Production
(Chapter, 2023)The use of H2 as a reductant in the iron and steel industry is an obvious choice towards carbon neutrality. For pyrometallurgical processes like Mn and Si, H2 cannot be the only solution, as the stability of the oxides of ... -
The use of hydrogen as a potential reductant in the chromite smelting industry
(Peer reviewed; Journal article, 2022)The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is mainly produced by the carbothermic reduction of chromite ore. Ever-increasing pressure on FeCr producers to ... -
Using AERMOD to predict the dispersion of emissions from the aluminum industry
(Master thesis, 2022)Økt fokus på de miljøskadelige effektene av utslipp har gitt opphav til strengere krav i sammenheng med utsippskontroll i aluminiumsindustrien. Derfor ønsker industrien å innføre effektive måter å estimere dispersjonen av ... -
Using Rotating Permanent Magnets for Pumping Aluminium in a Liquid Metal Loop
(Bachelor thesis, 2024)Aluminiumindustrien er avhengig av å pumpe flytende metall under resirkuleringsprosesser. På grunn av de høye korrosive egenskapene til flytende aluminium, må de eksisterende metodene for pumping unngå kontakt mellom ... -
Using Surplus Heat to Pre-Heat Carbon Anodes for Aluminium Electrolysis
(Master thesis, 2019)Karbon anoder brukes opp i Hall-Héroult prosessen og må erstattes regelmessig. Når en ny anode blir plassert i aluminiumsovnen, vil badet umiddelbart fryse på undersiden av anoden og danne et fryst isolerende lag. Denne ... -
Utherdbare bimetall materialer fremstilt ved skrueekstrudering: AA 6060/ren magnesium
(Master thesis, 2013)Skruekstrudering er en ny, innovativ prosess for å fremstille metaller. Prosessens store fortrinn er et relativt lav energiforbruk sammenliknet med tradisjonell ekstrudering, noe som i dagens energisamfunn er meget aktuelt. ... -
The Utilization of Bauxite Residue with a Calcite-Rich Bauxite Ore in the Pedersen Process for Iron and Alumina Extraction
(Peer reviewed; Journal article, 2021)Metallurgical grade alumina is produced worldwide through the well-known Bayer process, which unavoidably generates bauxite residue (BR, also known as red mud) in almost equal amounts to alumina. This study aims the ... -
Utilization of Recycled Concrete Fines for Carbon Capture and Subsequent Use as Supplementary Cementitious Material
(Master thesis, 2022)Betong är det vanligaste byggmaterialet i världen, men cementproduktionen står för 5-7 % av det totala CO2-utsläppet. [26] För att minska mängden CO2 från tillverkningen blandas ofta cement med mineraliskt tillsatsmaterial ... -
Utilization of waste heat for pre-heating of anodes
(Peer reviewed; Journal article, 2020)Carbon anodes are replaced on a regular basis in Hall–Héroult cells as they are consumed by electrochemical reactions. Upon insertion of new anodes, bath will freeze locally as a result of low bath superheat and comparatively ...