Blar i Institutt for materialteknologi på dokumenttype "Doctoral thesis"
Viser treff 81-100 av 318
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Effect of Composition and Thermomechanical Processingon The Intergranular Corrosion of AA6000 Aluminium Alloys
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:116, Doctoral thesis, 2010)In order to achieve the desired strength, AlMgSi (6000-series) alloys are often alloyed with either small (fraction of a wt%) Cu or excess (in relation to that required to form Mg2Si) amounts of Si. Both approaches can ... -
The Effect of Hydrogen and Methane Containing Gases on SiC and SiO formation
(Doctoral theses at NTNU;2023:48, Doctoral thesis, 2023)The production of silicon is currently done in a submerged arc furnace where quartz react with carbon. This emits large amounts of CO2to the atmosphere. From a global warming perspective this is far from ideal, and ... -
Effect of microstructure on precipitation of β-Mg2Si during cooling of Al-Mg- Si alloys
(Doctoral theses at NTNU;2024:228, Doctoral thesis, 2024)Processing of Al-Mg-Si alloys requires tight control of the various secondary Mg-Si phases that form during the processing steps. In this regard, the cooling stage after homogenisation is a crucial step because of the ... -
Effect of trace element lead on the electrochemistry and corrosion of aluminium alloys
(Doctoral thesis, 2005)Electrochemical activation of aluminium in chloride solution as a result of heat treatment at temperatures above 350°C is attributed to enrichment of trace element lead at the oxide-metal interface. Activation is manifested ... -
Effect of trace elements indium, tin and lead on anodic activation of aluminium
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:75, Doctoral thesis, 2009) -
Effects of scandium addition in wrought aluminium alloys
(Doktoravhandlinger ved NTNU, 1503-8181; 3, Doctoral thesis, 2002)A series of seven papers is presented in this thesis. Paper 1 is a comrehensive review of a considerable part of the available literature on Scandium in Aluminium alloys. Paper 2 and Paper 3 is a study of isothermal ... -
Effects of second-phase particles on texture during softening of an Al-Mn alloy investigated by correlative microscopy
(Doctoral theses at NTNU;2024:48, Doctoral thesis, 2024)Aluminium is the second most used metal by weight after iron, and aluminium alloys are some of the most important structural light alloys. Motivated by reducing weight, energy, and cost, many manufacturers are replacing ... -
Electrical Resistivity of Coke Beds
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:104, Doctoral thesis, 2008) -
Electrical Resistivity of Materials in the Silicon Furnace
(Doctoral thesis, 2023)Silicon is becoming an increasingly important part of the modern world through its applications in electronics, solar cells, and silicones, to name a few. Norway is a significant producer of silicon, competing with much ... -
Electro-oxidation of small organic molecules
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:348, Doctoral thesis, 2012)An alternative to fossil fuels is to utilize biofuels like methanol and ethanol directly in fuel cells. One drawback of this system is the sluggish reaction kinetics in methanol and ethanol oxidation where strongly bound ... -
Electrocatalysis and Novel Functions of Nano-Structured IrO2-Ta2O5 /Ti Anodes
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:70, Doctoral thesis, 2013)In the present work, the main purpose was the development of the IrO2-Ta2O5/Ti anodes to suppress the unwanted side reactions in industrial electrolytic processes. The mixed effects of Ir mole ratio and thermal decomposition ... -
Electrocatalysis of the Oxygen Evolution Reaction: A Comparative Study of Anodically Formed and Nanostructured Iridium Oxides
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:26, Doctoral thesis, 2010)The thesis deals with electrocatalysts for the oxygen evolution reaction for proton-exchange membrane (PEM) water electrolysis. Water electrolysis is considered the only viable option for large-scale hydrogen production. ... -
Electrocatalysts for medium temperature PEM water electrolysis
(Doctoral Theses at NTNU, 1503-8181; 2013:190, Doctoral thesis, 2013)The main subject of this PhD thesis is the fabrication and investigation the electrochemical behavior of anode catalysts appropriate for medium- temperature proton exchange membrane (PEM) water electrolysis (WE) operating ... -
Electrochemical and photoelectrochemical characterization of porous semiconducting electrodes
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:262, Doctoral thesis, 2013)CaNb2O6 particles with crystallite sizes from 24 to 64 nm have been produced by solgel synthesis. The flatband potential was by impedance measurements determined to be around -0.4 V vs. NHE for a bulk sample, which is in ... -
Electrochemical Characterisation of Carbon-Supported Ru@Pt Core-Shell Catalyst for the Direct-Methanol Fuel Cell
(Doctoral thesis at NTNU;2016:173, Doctoral thesis, 2016)The world is in an energy transition period, going from predominantly fossil fuel energy sources to more renewable sources. This is especially happening in the transportation sector, where oil is the dominant source. ... -
Electrochemical Characterization of Melt Spun AB5 Type Alloys for Metal Hydride Batteries
(Dr. ingeniøravhandling, 0809-103X; 2003:45, Doctoral thesis, 2003)This thesis is part of a larger research project where two metal hydride forming AB5 type alloys have been investigated. A slightly non-stoichiometric alloy with mischmetal on A-site and nickel, cobalt, manganese and ... -
Electrochemical Co-Deposition of Alloying Elements during Aluminium Electrolysis in a Laboratory Cell
(Doctoral theses at NTNU;2021:121, Doctoral thesis, 2021)Aluminium alloys are mainly produced by the so-called melt mixing at which an alloying element is added to the molten aluminium before casting. This approach suffers from several drawbacks such as the high requirements of ... -
Electrochemical formation of nanostructures in cryolitic melts
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:242, Doctoral thesis, 2008) -
Electrochemical Oxidation of Methanol and Formic Acid in Fuel Cell Processes
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:204, Doctoral thesis, 2005)The main objectives of the thesis work were: (1), to study the oxidation of methanol and formic acid on platinum electrodes by employing conventional and advanced electrochemical methods, and (2), to develop membrane ... -
Electrochemical Passivation and Texturing of Silicon Wafers in Alkaline Solutions
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:339, Doctoral thesis, 2012)Texturing of silicon wafers is an important process step in fabrication of solar cells in order to reduce the reflection of incoming light radiation on the solar cell surfaces. The conventional wet chemical etching methods ...