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EBSD Quantification of Retained Austenite in 9% Ni Steel Related to Thermal Treatments
(Chapter, 2015)The present work has been to study the effect of different finalizing preparation techniques on the amount of retained austenite measured with Electron Backscatter Diffraction (EBSD) and X-Ray-Diffraction (XRD) analysis. ... -
Effect of Cathodic Polarization on the Susceptibility to Hydrogen Embrittlement in 5xxx, 6xxx and 7xxx Series Aluminium Alloys
(Master thesis, 2015)Aluminium is an interesting material for use in subsea applications due to the combination of low weight, good corrosion resistance and superior low temperature properties. So far, the use of aluminium alloys in offshore ... -
Inclusion Optimized Silicon for the Production of Silicones
(Master thesis, 2015)One of the challenges with silicones production is the accumulation of impurities from metallurgical grade silicon (MG-Si) in the reactor. Size, shape and density of the intermetallics affect the accumulation, and their ... -
Ferroelectric Transitions in SrxBa(1-x)Nb2O6 - Effect of Thermal History on the Functional Properties
(Master thesis, 2015)Many functional materials used in todays electronic equipment have a high content lead. Due to the environmental challenges related to production and usage of such materials, extensive research has been preformed on lead-free ... -
Mn alloys production with the use of natural gas. - Understanding the kinetics of Mn alloy production
(Master thesis, 2015)This research intends to develop the necessary understanding regarding the reaction kinetics involved in the production of manganese ferroalloys. The main reactions of interest are as follows: MnO_((l) )+C_((s,l))=Mn_((l ... -
Effect of Mn and Dispersoids on Grain Structure, Mechanical Properties and Crush Behavior of Extruded AA6082 Alloys
(Master thesis, 2015)In this study five different variants of an AA6082 aluminum alloy were investigated. The alloys have various amounts of Mn (0.006-1.172 wt%) and are homogenized in two different ways. After homogenization the billets got ... -
Metal loss comprehension - metal emulsions in ferromanganese slags
(Master thesis, 2015)Literature review was done on metal in slag emulsions, using the surface phenomena literature in metallurgy as well as the oil and water emulsion broader literature. Several phenomena were found that could extend to the ... -
Fatigue of Extruded AA6082 and AA7108 Alloys - The Effects of Natural Ageing Compared to Artificial Ageing
(Master thesis, 2015)Heat treatable aluminium alloys might have the potential to gain unexpected increase in mechanical properties when stored at room temperature (natural ageing) after extrusion, for long periods of time. The main aim of the ... -
Impurities in Ilmenite: Magnesium
(Master thesis, 2015)The influence of Mg as main impurity in ilmenite during gaseous reduction with CO and H2 gas was studied in this work. This is of interest for the ilmenite pre-reduction step in the Tyssedal Process as where the impurities ... -
The Effect of Magnetic Field and Sulphide-Pollution on Corrosion Behaviour of Nickel-Aluminium Bronze in Seawater
(Master thesis, 2015)The objective with this work was to investigate the corrosion behaviour of nickel-aluminium bronze in both pure and sulphide-polluted seawater, and possible synergy effects with an applied magnetic field (MF). Two different ... -
Electrochemical Reduction of Indium and Tin Oxides from Molten Salts
(Doctoral thesis at NTNU;2015:187, Doctoral thesis, 2015)Indium is considered to be a rare element. The largest end use for indium is ITO powder. ITO is indium oxide combined with 10 percent tin oxide and this represent approximately 72 percent of the indium market. ITO can ... -
Mechanical stability of piezoelectric properties in ferroelectric perovskites
(Journal article; Peer reviewed, 2015)The influence of uniaxial compressive stress on the small signal direct piezoelectric coefficient of hard and soft Pb(Zr,Ti)O3 at the morphotropic phase boundary was investigated as a function of temperature from 25 °C to ... -
Sintering of lead-free piezoelectric materials
(Master thesis, 2015)Piezoelectric ceramics are used in many types of devices, and today, lead zirconate titanate (PZT) dominates the market due to its superior properties. Environmental and health concerns have made the search for lead-free ... -
Seebeck coefficients of cells with lithium carbonate and gas electrodes
(Journal article; Peer reviewed, 2015)The Seebeck coefficient is reported for thermoelectric cells with gas electrodes and a molten electrolyte of one salt, lithium carbonate, at an average temperature of 750 °C. We show that the coefficient, which is 0.88 mV ... -
Impurities in the Crucible-Coating-Silicon System for Solar Cell Applications
(Master thesis, 2015)Materials of high purity are required for the production of crystalline silicon for solar cells. Impurities are indeed very detrimental to solar cell efficiency. Contamination can occur at many stages during the processing, ... -
Precipitation of Non-Spherical Particles in Aluminum Alloys Part I: Generalization of the Kampmann–Wagner Numerical Model
(Journal article, 2015)Particles precipitated during aging treatments often have non-spherical shapes, e.g., needles or plates, while in the classical Kampmann–Wagner Numerical (KWN) precipitation model, it is assumed that the particles are of ... -
Fe and V substituted Li2MnSiO4/C As Potential Cathode Material for Li-Ion Batteries
(Journal article; Peer reviewed, 2015)Lithium transition-metal silicate materials are promising candidates for next generation Li-ion batteries since they allow Li extraction/insertion beyond one Li ion per formula unit. They consist of cheap, non-toxic and ... -
Bubble evolution and anode surface properties in aluminium electrolysis
(Journal article, 2015)One significant contribution to the anodic potential during aluminum electrolysis is the formation of CO2 bubbles that screen the anode surface. This effect creates an additional ohmic resistance as well as an increased ... -
Zirconium hydrogen phosphate as an additive in electrocatalytic layers for the oxygen evolution reaction in PEM water electrolysis
(Journal article, 2015)For reasons of electrode integrity and durability it is desirable to add zirconium hydrogen phosphate to electrocatalytic layers in PEM water electrolysis. Common synthesis methods are frequently associated with an ... -
Effect of Firing Temperature on the Kinetics of Oxygen Reduction in La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) Cathodes for Solid Oxide Fuel Cells
(Master thesis, 2015)In the present work, symmetric cells consisting of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathodes and a Ce0.9Gd0.1O2-delta (CGO) electrolyte were fabricated. Both materials were spray-pyrolyzed by CerPoTech AS (Trondheim, ...