Blar i Institutt for materialteknologi på utgivelsesdato
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Molten Carbonate Electrolyte Based Thermocell for High Temperature Waste Heat Recovery
(Doctoral theses at NTNU;2018:321, Doctoral thesis, 2019)Industrial processes for the production of metals and alloys by metallurgical and electrochemical methods generate a lot of waste heat due to irreversible losses. This waste heat could be used as a power source to produce ... -
New low temperature aluminium production process
(Master thesis, 2019)Aluminiumsproduksjon i dag er både dyrt og tidkrevende, med flere høyenergikrevende steg på veien. Bauxitt må først graves ut, for så å bli raffinert til Al2O3. For å redusere Al2O3 til ren aluminium kreves temperaturer ... -
Critical temperature of welded 25Cr duplex stainless steel in seawater
(Master thesis, 2019)Statens Vegvesen planlegger ˚a bygge verdens lengste flytebro over Bjørnafjorden som en del av Ferjefri E39- prosjektet. En av de foretrukne alternativene involverer karbonst˚al-pontonger med et belte rundt skvalpesonen ... -
Slag-metal interactions in the FeMn tapping process: Interfacial properties and wetting
(Chapter, 2019)FeMn-alloys are produced by transforming ore and carbon materials into FeMn and slag at high temperatures in a furnace. Entrainment of FeMn in slag during tapping reduces the yield. Entrainment and subsequent separation ... -
Strategies for the analysis of the elemental metal fraction of Ir and Ru oxides via XRD, XANES, and EXAFS
(Peer reviewed; Journal article, 2019)Iridium and ruthenium oxide are active electrocatalysts for oxygen evolution. The relation between preparation method, structure, and behavior of mixed oxides of iridium and ruthenium are of interest in order to obtain ... -
Dissolution kinetics of carbon materials in FeMn
(Doctoral theses at NTNU;2019:226, Doctoral thesis, 2019)Submerged electric arc furnace (SAF) is the main process for industrial production of ferroalloys, in which metal oxides are reduced by carbon. To decrease the production cost and reduce the CO2 emissions, a variety of ... -
Behaviour of Aluminium Carbide in Al-melts during Re-melting
(Journal article; Peer reviewed, 2019)The presence of non-metallic inclusions in aluminium has become a more critical issue with increasing demands on surface quality and low final wall thicknesses of products. Aluminium carbide particles form during the primary ... -
Effect of Processing Parameters on the Relative Density of AlSi10Mg Processed by Laser Powder Bed Fusion
(Chapter, 2019)In order for a material processed by laser powder bed fusion (LPBF) to achieve the desired mechanical properties, the relative density of the material should be as high as possible. In this study, the effect of various ... -
Non-steady 3D dendrite tip growth under diffusive and weakly convective conditions.
(Journal article; Peer reviewed, 2019)Three dimensional α-Al dendrite tip growth under varying solute gradients in an Al-Cu-Si alloy melt has been studied using real time synchrotron X-ray imaging and mathematical modelling. X-radiographic image sequences with ... -
Transport and catalytic properties of hexagonal manganese oxides
(Master thesis, 2019)Tette keramiske membranar med blanda ionisk og elektronisk leiingsevne kan vera eit meir energieffektivt og miljøvenleg alternativ til kryogen destillasjon, for å imøtekome den auka et- terspurnaden av rein oksygengass. ... -
In situ monitoring of pit gas composition during baking of anodes for aluminum electrolysis
(Journal article; Peer reviewed, 2019)Carbon anodes, which are consumed in aluminum electrolysis, are fabricated in separate anode plants where coke and pitch are mixed and vibrocompacted to green anode blocks before being baked in anode baking furnaces. The ... -
Experimental Characterization of Two-Phase Steels
(Doctoral theses at NTNU;2019:275, Doctoral thesis, 2019)This thesis consists of several in-situ scanning electron microscope (SEM) tensile test studies of different two- phase steels. Three different two-phase steels have been investigated: a NVE36 plate steel, a dual-phase ... -
Heat to H2: Using Waste Heat for Hydrogen Production through Reverse Electrodialysis
(Journal article; Peer reviewed, 2019)This work presents an integrated hydrogen production system using reverse electrodialysis (RED) and waste heat, termed Heat to H2. The driving potential in RED is a concentration difference over alternating anion and cation ... -
Electrochemical Behavior of Tin in Molten LiCl-KCl at 450 ℃
(Journal article; Peer reviewed, 2019)The electrochemical behavior of tin was studied with cyclic voltammetry at glassy carbon electrodes in the fused LiCl-KCl at 450 ℃. Metallic tin deposition on the glassy carbon electrode occurs at a potential of around ... -
Mechanisms of graphite crucible degradation in contact with Si–Al melts at high temperatures and vacuum conditions
(Journal article; Peer reviewed, 2019)Graphite is a common refractory material for processing high purity silicon; however, it cannot be applied for holding Si–Al melts at high temperatures due to significant melt infiltration into the crucible. This research ... -
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 ... -
Texture evolution of an Al-8Zn alloy during ECAP and post-ECAP isothermal annealing
(Journal article; Peer reviewed, 2019)In this work, the texture evolution of an Al-8 wt% Zn alloy during equal channel angular pressing (ECAP) and post-ECAP isothermal annealing was systematically investigated by electron backscatter diffraction (EBSD). Special ... -
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. ... -
Inside the electrode: Looking at cycling products in Li/O2 batteries
(Journal article; Peer reviewed, 2019)This work investigates the impact of electrochemical reactions and products on discharge capacity and cycling stability with electrolytes based on two common solvents – tetraethylene glycol dimethyl ether (TEGDME) and ... -
Systematic Study on TiO2 Crystallization via Hydrothermal Synthesis in the Presence of Different Ferrite Nanoparticles as Nucleation Seeds
(Journal article, 2019)In the present work, the crystallization of anatase TiO2 nanoparticles (NPs), using different fer2 rite nanoparticles with different chemical composition, dimensions and shape as nucleation seeds, was investigated. In ...