Institutt for materialteknologi
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Vacuum and Gas Refining of Silicon for Solar Cell Applications
(Doctoral theses at NTNU;2021:244, Doctoral thesis, 2021)In this research, the vacuum and gas refining for P and B removal from Si to reach solar grade silicon (SoG – Si) are studied. The vacuum refining process is modeled by applying the Hertz – Knudsen – Langmuir evaporation ... -
Novel Topological Spin Solitons for Spintronics Applications
(Doctoral theses at NTNU;2021:227, Doctoral thesis, 2021)Topologically non-trivial spin solitons, such as skyrmions and magnetic edge dislocations, are particle-like nanoscale configurations in the magnetization field. In solid state systems, they can be written, moved, and ... -
Manganese Oxide in Zinc Electrowinning: Deposition and removal at platinum, gold and IrO2-Ta2O5/Ti anodes in sulphuric acid
(Doctoral theses at NTNU;2021:242, Doctoral thesis, 2021)An environmentally friendly and energy efficient replacement for lead anodes in zinc electrowinning is highly desired. Oxygen evolution reaction (OER) is the desired anode reaction in acidic sulphate electrolytes. However, ... -
Ir based catalysts for PEM water electrolysis prepared via galvanic displacement
(Doctoral theses at NTNU;2021:187, Doctoral thesis, 2021)In the transition away from non-renewable energy sources, the use of fluctuating power sources such as wind and solar are increasing. This creates a need for temporary storage of excess energy when production exceeds demand. ... -
P removal from Si by Si-Ca-Al alloying-leaching refining: Effect of Al and the CaAl2Si2 phase
(Peer reviewed; Journal article, 2021)Phosphorus (P) is a critical impurity in metallurgical-grade Si that needed to be removed for solar-grade Si production. The Si-Ca-Al-P system is one of the most crucial alloy systems for Si refining, where P can be separated ... -
Tailoring microstructure and texture of annealed Al-Mn alloy through the variation of homogenization and prior cold deformation strain
(Peer reviewed; Journal article, 2020)The grain structures and crystallographic textures desired for various applications of aluminium alloys are usually modified by recrystallization during annealing. In this study, the interactions between recrystallization ... -
Microstructure Evolution and Recrystallization Resistance of a 7055 Alloy Fabricated by Spray Forming Technology and by Conventional Ingot Metallurgy
(Peer reviewed; Journal article, 2020)The effect of different fabricating processes (spray forming and conventional casting) and homogenization treatment on the microstructure of an 7055 alloy was investigated by optical microscopy (OM), scanning electron ... -
Effects of iron precipitation and novel metal screw extrusion on electrical conductivity and properties of AA1370 aluminium
(Journal article; Peer reviewed, 2020)In order to develop well-performing aluminium electrical conductors, the role of iron and processing method on electrical and mechanical properties was studied for an AA1370 alloy. Firstly, Ø3 mm cold drawn wires were ... -
High temperature interaction between Si–B alloys and Si3N4
(Peer reviewed; Journal article, 2021)Si3N4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si3N4 were ... -
Linking mechanical properties to precipitate microstructure in three Al-Mg-Si(-Cu) alloys
(Peer reviewed; Journal article, 2021)The mechanical properties of age hardenable Al alloys depend strongly on the precipitate microstructure. This work has investigated the relationship between properties such as strength and ductility and the distribution ... -
Heating New Anodes Using the Waste Heat of Anode Butts: Establishing the Interface Thermal Contact Resistance
(Peer reviewed; Journal article, 2021)In order to be able to assess the rate of heat transfer between a new anode and an anode butt, it is critical to measure the interface thermal contact resistance between them. For that purpose, a lab experiment has been ... -
Chromium coatings from trivalent chromium plating baths: Characterization and cathodic delamination behaviour
(Peer reviewed; Journal article, 2021)Novel two-layer chromium-based coatings comprised of a first layer containing chromium, oxygen and carbon (Cr-O-C) and an oxygen rich (Cr-O) topcoat were electrodeposited from trivalent chromium electrolyte. The complex ... -
The Structure, Morphology, and Complex Permittivity of Epoxy Nanodielectrics with in Situ Synthesized Surface-Functionalized SiO2
(Peer reviewed; Journal article, 2021)Epoxy nanocomposites have demonstrated promising properties for high-voltage insulation applications. An in situ approach to the synthesis of epoxy-SiO2 nanocomposites was employed, where surface-functionalized SiO2 (up ... -
Electrolysis of indium oxide in LiCl-KCl based molten salts with a liquid cathode
(Peer reviewed; Journal article, 2020)In this work, the feasibility of extracting of metallic indium from In2O3and ITO through the direct electrochemical reduction at 450°C in molten salt LiCl-KCl was studied. Cyclic voltammetry was carried out to study the ... -
The beginning and the end of the aluminium value chain
(Peer reviewed; Journal article, 2020)Metallic aluminium does not naturally occur in nature, and it was largely unknown, virtually a mystery, until 200 years ago. The modern aluminium production using a hydrometallurgical refining process for making alumina ... -
Slow surface diffusion on Cu substrates in Li metal batteries
(Peer reviewed; Journal article, 2021)Dendrite growth on the lithium metal anode still obstructs a widespread commercialization of high energy density lithium metal batteries. In this work, we investigate how the crystal structure of the copper foil current ... -
A Review of Ferroalloy Tapping Models
(Peer reviewed; Journal article, 2021)Tapping is an important furnace operation in the ferroalloy industry and poses a number of complex and coupled challenges of both practical and economical importance. Owing to the hazardous high-temperature conditions ... -
Production Rate of SiO Gas from Industrial Quartz and Silicon
(Peer reviewed; Journal article, 2021)The production rate of SiO gas from industrial quartz and silicon has been investigated by isothermal heat treatment experiments. Mixtures of silicon and different quartz samples have been heated to temperatures ranging ... -
The effect of Equal Channel Angular Pressing on the stress corrosion cracking susceptibility of AZ31 alloy in simulated body fluid
(Peer reviewed; Journal article, 2020)Despite the great potential of Mg and its alloys as material for biodegradable implants, their low resistance to the simultaneous action of corrosion and mechanical stresses in the human body have hampered their use. Stress ... -
Electrodeposition of aluminium containing alloys from molten fluoride electrolytes containing metal oxides
(Peer reviewed; Journal article, 2020)Aluminium is produced by the Hall-Heroult process by electrowinning in a molten fluoride electrolyte with dissolved alumina at ~955oC. Several metallic impurities typically end up in the produced metal due to the fact that ...
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