Blar i Institutt for materialteknologi på utgivelsesdato
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Rheological Characterization of Fluid Models for Pitch and Binder Matrix in Anodes
(Master thesis, 2019)Karbonanoder brukes til å produsere primæraluminium og forbrukes i løpet av elektrolysen. Anodene må derfor kontinuerlig erstattes og produseres. Problemer relatert til prosesseringen av anoder inkluderer heterogen tetthet ... -
Carbon Cathode Wear in Aluminium Electrolysis Cells
(Peer reviewed; Journal article, 2019)Autopsies of six spent potlinings with different carbon cathode block grades, amperage regimes and cell designs were conducted at three separate smelters to reveal possible mechanisms causing cathode wear. The microstructure ... -
Epitaxial K0.5Na0.5NbO3 thin films by aqueous chemical solution deposition
(Journal article; Peer reviewed, 2019)We report on an environmentally friendly and versatile aqueous chemical solution deposition route to epitaxial K0.5Na0.5NbO3 (KNN) thin films. The route is based on the spin coating of an aqueous solution of soluble ... -
Effect of Mn and cooling rates on α-, β- and δ-Al–Fe–Si intermetallic phase formation in a secondary Al–Si alloy
(Journal article; Peer reviewed, 2019)Secondary Al–Si alloys Al7.1Si(1.5-xMn)Fe(xMn)Mn with xMn = 0, 0.3, 0.375, 0.6, 0.75 at.% have been solidified with different cooling rates: 0.05 K/s, 1.4 K/s, 11.4 K/s and 200 K/s. In the ternary alloy with xMn = 0 at.%, ... -
Electrodeposition of Silicon with a Liquid Gallium Cathode in Molten Salts
(Journal article; Peer reviewed, 2019)Further development of solar power depends largely on the availability of inexpensive solar grade silicon. Electrodeposition is a candidate method to produce high purity silicon at a reasonable cost. A new approach using ... -
Characterization of the Density and Spatial Distribution of Dispersoids in Al-Mg-Si Alloys
(Journal article; Peer reviewed, 2019)Al-Mg-Si alloys often contain small additions of, for example, Mn or Cr, to form dispersoids, which may act as nucleation sites for Mg2Si particles after homogenization. The purpose of adding Mn and Cr is to ensure a high ... -
Progress in Understanding Initiation of Intergranular Corrosion on AA6005 Aluminum Alloy with Low Copper Content
(Journal article; Peer reviewed, 2019)As part of an extensive research program to study recent, unexpected intergranular corrosion (IGC) on 6xxx series aluminum alloys (AlMgSi), this paper investigates the mechanism of initiation and early propagation of IGC ... -
Thermoelectric Properties of Ca3Co2−xMnxO6 (x = 0.05, 0.2, 0.5, 0.75, and 1)
(Journal article; Peer reviewed, 2019)High-temperature instability of the Ca3Co4−yO9+δ and CaMnO3−δ direct p-n junction causing the formation of Ca3Co2−xMnxO6 has motivated the investigation of the thermoelectric performance of this intermediate phase. Here, ... -
Gamma-isotoper i industriell radiografi
(Bachelor thesis, 2019)Problemstillingen i denne rapporten var å vurdere muligheten for å avvikle gamma-isotoper i indusriell radiografi. Store deler av arbeidet bestod av å utføre intervjuer med ulike bedrifter i bransjen. Det ble også utført ... -
Orientation independent and dependent subgrain growth during iso-thermal annealing of high- purity and commercial purity aluminium
(Journal article; Peer reviewed, 2019)The orientation dependence on recovery has been studied in cold-rolled and annealed polycrystalline high-purity aluminium (99.99 wt%), binary Al-0.25Mn and commercial purity aluminium. The growth mechanisms were found to ... -
Modelling Grain Growth with the Phase Field Method
(Master thesis, 2019)Kornvekst i et metall innebærer at kornene, volumer med atomer med samme orientering av krystallstrukturen, vokser og absorberer mindre korn, hvilket resulterer i en mer grovkornet struktur. Å forstå denne prosessen er ... -
Synthesis and thermal decomposition of sodium rare-earth borohydride halides
(Master thesis, 2019)Sjeldne jordarts borhydrider har tiltrukket seg stor interesse på grunn av deres mulighet for energilagring. Materialene har et høyt hydrogeninnhold og gode ledningsevner for Li-ioner. Det kreves imidlertid høye temperaturer ... -
Comparing Anodic Bubble Behavior of Anodes from Anisotropic and Isotropic Cokes in Laboratory Scale Aluminum Electrolysis Cells
(Journal article; Peer reviewed, 2019)During production of aluminum in Hall-Héroult cells, carbon anodes electrochemically oxidize to form mainly CO2. The CO2 bubbles block the anode working surface during growth and coalescence, leading to cell voltage loss ... -
Karakterisering av mikrostruktur og mekaniske egenskaper til selektiv lasersmeltet AlSi10Mg og AlSi7MgCuHf, direkte på en AlSi7MgCu støpelegering
(Master thesis, 2019)Selektiv lasersmelting (SLS) er en av flere metoder under additiv tilvirkning. Produktet bygges ved at en laser smelter pulverpartikler sammen lag for lag. Til forskjell fra de konvensjonelle metodene som støping, ekstrudering ... -
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 ... -
Synthesis and Characterisation of NMC622 Cathodes for Lithium-Ion Batteries
(Master thesis, 2019)Effektive batterier med høy kapasitet blir stadig viktigere i samfunnet, hvor folk blir mer og mer avhengig av bærbare elektroniske enheter og elektriske kjøretøy. På bakgrunn av dette har Glencore Nikkelverk AS startet ... -
FIB lift-out of conducting ferroelectric domain walls in hexagonal manganites
(Journal article; Peer reviewed, 2019)A focused ion beam (FIB) methodology is developed to lift out suitable specimens containing charged domain walls in improper ferroelectric ErMnO3. The FIB procedure allows for extracting domain wall sections with well-defined ... -
Electrochemical Behaviour of Carbon Anodes Produced with Different Mixing Temperatures and Baking Levels—A Laboratory Study
(Chapter, 2019)Anodes fabricated from a single source coke were used for investigations of effect of porosity and surface roughness on the electrochemical performance in laboratory scale cells. In order to fabricate anodes differing in ... -
High Temperature Interaction of Si-B Alloys with Graphite Crucible in Thermal Energy Storage Systems
(Journal article; Peer reviewed, 2019)Si-B alloys are proposed as a potential phase change material (PCM) in the novel high temperature thermal energy storage systems. For successfully introducing the new PCM, the selection of proper refractory material in the ...